The heart of this circuit is IC No. 555. When the
alert sound was working, even though the switch will continue to be the same,
the sound still does not stop immediately.But it will stops automatically, when
a set time period,Depending on the resistance of R3, the circuit so I set a time
period equal to 1M for 1 minute 6 seconds.
The output of IC 555 is triggered
by a positive voltage on pin 2,when all switches are connected together.When the
something switch is cut off pin 2, it will be negative voltage and the trigger
IC 555 will stop. The C1, C4 to protects a noise signal from either switch,
which may cause the alarm to be up. This circuit can be used with power supply
from 5V to 15V depending on relay sure enough.
This is a simple noise generator circuit. An IC
Timer IC 555 is a number of major equipment. Small circuit. Suitable for various
test circuits.
Operation of the circuit is when the power supply to the
circuit. It will give birth to high frequency by using a circuit IC1 to a
multi-state Devices Bill Brett Foster. The frequency with which R1, C1 and C2.
The frequency will be out in three legs. And will be expanded with the IC2
output pin out of 5 in order to drive the speakers. The high-frequency sound.
But when the switch S1, capacitor.
C1, which continue to cycle in a manner
parallel to the C2 value higher density. IC1 will give birth to low-frequency
out of pin 3 to IC2 then drive the speakers. This circuit can cause the audio
source has two frequency
dc to dc converter using ic ne555
This circuit is called DC TO DC converter circuit.Which
increase the voltage circuit.There can be customized to change the output
values.
When the power supply input to IC1 is the output pin 3 at a frequency
of 1 kHz.The frequency is Q1 and Q2, which will continue to use push pool work
interchangeably.If this is the positive output signal Q1 Q2 will run the delete
function this reason, C2 and C3 capacitors are half-wave alternating.
When to
use. Voltage from C2 to C3 is discharged out to the input voltage over almost
two times less than 2 times due to the loss of diodes D1-D3
Electronic mailbox front door with ic 555
Living in the current rush to waste time to even have little
value. Electronic circuits, so one is important in everyday life.Which saves
time and convenience.
For example, this circuit. It gives us no time to wait
to check voice mailbox.We see the LED is just enough.
Operation of the
circuit. While no letter LDR will receive light from the lamp. The LDR
resistance is very low. Resulting in IC does not work.
There is no output
from the 3 pin. It make the current flows through R2, LED2 into three legs of
IC1.The light LED2.But when a letter in the mail box to shield the light from
the lamp. The LDR is not light. LDR will be much resistance.Voltage drop across
the LDR is high enough to make IC1 work.
IC1 to produce frequencies from 3
pin. The light LED1
Negative supply voltage low current
This circuit is a negative power supply integrated. Which can
be applied to circuits that do not need much flow. Using IC No. 555. The core of
the circuit.
Work of the circuit is IC1, R1, R2 and C1. The range of the A
Stable Multi Vibrator, and the output is a square wave. It is a positive signal
pulse frequency of 2.3 kHz output pin 3 of IC1.And C3 and D1 connected to
circuit CLAMP. That it serves to signal a positive pulse to pulse signal
negative.The D2 and C3 act negative pulse signal is converted direct current
(DCV) electrical signals. The negative power. Thus the output voltage to a
negative DC electrical
Ding-Dong sound generator by NE555
This is the circuit diagram of a ding dong sound generator
based on two NE555 timer ICs.The circuit is designed to toggle between two
adjustable frequencies to produce the ding dong sound. The first NE555 (IC1) is
wires as an astable multivibrator operating at 1Hz. The frequency of the second
NE555 (IC2) is modulated by the output from the first IC. This is attained by
connecting the output of first IC to the control pin (pin5) of the second IC.
The tone of the sound depends on the frequency of the second IC and the
changeover time depends on the frequency of the first IC
Police sirens sound with ic 555
Many a person will might excited with siren sound the all
that ever hear. Because we will hear when there is an accident emergency event.
But ever suspect that how is those sound can happen ?
The work of the circuit
IC1 which build be astable multi vibrator circuit. Will signal frequency low
origin comes out the way pin 3 have about 1 Hz by frequency value that s were
fixed by the value , R1, R2, C1 signal the frequency will have that to come out
pin 3 ways which built get along well with 5 of IC2 change R5 . By the frequency
from IC1 will touch total up with the frequency at IC2 establish will valuable
about 440 Hz – 550 Hz the frequency had that to sent come out pin 3 ways. Which
be take gush up of IC2 the connection goes to get along well with B of Q1 for
enlarge the trend comes to sing bail make the sound of the circuit that comes
out resemble the sound of police siren
Missing pulse detector circuit using NE555
An NE555 timer IC connected as shown here can detect a missing pulse or
abnormally long period between two consecutive pulses in a train of pulses,Such
circuits can be used to detect the intermittent firing of the spark plug of an
automobile or to monitor the heart beat of a sick patient.
The signal from the pick up transducer is shaped to form a
negative going pulse and is applied to pin 2 of the IC which is connected as a
mono stable.As long as the spacing between the pulse is less than the timing
interval,the timing cycle is continuously reset by the input pulses and the
capacitor is discharged via T1.A decrease in pulse frequency or a missing pulse
permits completion of time interval which causes a change in the output
level
Two sirens sound with ic 555
Operation of the circuit. Circuit is divided into three
parts: low frequency production. The manufacturing high frequency and extension
of production low frequency is obtained from IC1 connected to astable multi
vibrator circuit frequency is set by R1, C2 frequencies that are coming out of
pin 3 is about 1 Hz through R2 to be good 5. of IC2, a division produce
high-frequency input at Pin 5 will tone the origin of oscillator IC2 is the
ripple of voltage from the output of IC1 frequency of IC2 is being set by R3,
C3, which, if C3 value. will be very low tone if C3 is less treble The output
will have to stand out in three legs of IC2 to stimulate B of Q1 to amplify
signals that drive speakers
9V battery changed to -5V
To test the circuit or circuits that may need some circuits,
but we have no fire-5V power supply-5V, but if the battery 9V circuit can allow
us to use the volt-5V as desired.
By using IC NE555, which causes wave square
the sector output allows the voltage about 6V when the signal on the output from
a pulse plus C2 acts charge through D1 to ground and if the pulse negative
capacitor C2 will discharge. through diode D1 and capacitor C3 to chage that
negative voltage is about-6V, but being removed to the number of left-5V zener
diode ZD1 current output will be approximately 12mA
Doubler voltage 12vdc to 24vdc with NE555
This be Simple Doubler Voltage circuit, from voltage 12VDC to be 24VDC. By
use Timer IC highly popular the number NE555 and other equipment a little again.
It can give current get about 50mA convenient for the circuit, that use low
current the small-sized.
The principle works of the circuit be, When use Volt input
12VDC give with the circuit will touch Filter current smoothly with
increasingly. The capacitors C5 give with IC1, The resistor R1,R2 and ,
capacitors C1, Which build the circuit model astable multi vibrator Square wave
generator, at the frequency about 2KHz come out the way pin 3 of IC1. By have
capacitors C3,C4 diode D1 and D2. Which build be boost up voltage x 2,which will
enhance the level Volt out be the direct current about 24VDC or 2 times of the
level Volt input
One – Shot Timer use IC NE555
This is digital circuit, It is One – Shot Timer make by IC 555.
Power
supply 5-15V, Output pin 3, Input pin 2 Trigger input.
T = 1.1 RC
Bounceless switch using IC NE555
This is circuit Bounceless Switch ,
Use IC 555 Timer for Easy Timer
circuit.
Output pin 3 pluse 0.1s. Control by push S1.
Volt supply pin 8 =
12Volt
Rain Alarm using NE555
This circuit gives out an alarm when its sensor is wetted by
water. A 555 astable multivibrator is used here which gives a tone of about 1kHz
upon detecting water. The sensor when wetted by water completes the circuit and
makes the 555 oscillate at about 1kHz.
The sensor is also shown in the
circuit diagram. It has to placed making an angle of about 30 – 45 degrees to
the ground. This makes the rain water to flow through it to the ground and
prevents the alarm from going on due to the stored water on the sensor
Water Softener Circuit using NE555
That circuit is based at a technique to remove or neutralize
the salt in water, and protect the pipes at home as well as the washing machines
or our selves from salt. Its called water softener and its automated circuit
using two 555 timers. The cost of parts is nearly 10$ and its very easy to build
it
Sweeping Output Frequency Siren
This circuit is a variation of the “Two Tone” siren that is a
standard for the LM555 timer. The circuit allows the output frequency of the ‘B’
timer to ‘sweep’ between two frequencies rather than switching abruptly between
two fixed frequencies
Electronic Time Constant Control
These circuits show methods of changing the operating
frequency of astable LM555 timers electronically. Any source that can drive the
base of transistor Q1 can control these circuits.
The advantage of using this
type of frequency control is that the duty cycle of the timer is not affected
when the frequency is changed
Touch Switch low cost by Timer IC 555
This Touch Switch circuit use a part compares with voltage 2
group , within the integrated circuit timer LM555 or NE555. For perform wait for
catch the change of voltage , which be born from way leakage touches by change a
finger. When the value is Resistance at drop the pate which build with pin 2 of
the integrated circuit is valuable are down the level is Voltage output (pin 3).
Will have the condition voltage high for apply the work and other circuit next.
The detail is other , a friend sees in the circuit yes
Danger Beep by IC 555
This is danger beep circuit. It use 555 integrated number
circuits build to are a stable mutivibrator that be valuable duty cycle 5%
driver loudspeaker 8ohm 0.25W sizes. By change transistor BD136 will get danger
beep use make person penetrate a hole is frightened or call for the interest
from a neighbor for asks for help. Because of use part a little , then have
small-sized and use current just 50mA from a place turns on the power supply
9Volt only
Spot lamp dimmer by LM555 and TIP2955
This circuit is DC Dimmer Circuit. By use IC LM555 be model
Astable Multi vibrator. It is can change translate Duty Cycle with fining VR1
and VR2 be formed fine brightness level that want. The output of IC1 be formed
limit load in something Oscillator and limit current of Q2 with. The D1 be
formed protect Oscillate. For the Q1- TIP2955 and Q2 – MJ2955 should hold heat
sink unless. Still can use S1 choose wasp a light bulb directly or Dimmer Lamp.
For load of this circuit you can use 10A 12V topmost. Request a friend is
entertained with Spot lamp dimmer by LM555 and TIP2955 , this please yes
Positive Negative Probe with IC 555
With this circuit you can can check that which dot of the
circuit is Positive Volt or Negative Volt which. This cheap circuit uses the a
little component is will appropriate apply with an automobile or motorcycle.
This circuit works during Voltage between 5-15V. When build volt supply of
circuit LED 2 pcs. of stick bright but enough check meet Positive Volt make at
pin 3 of IC 555 liberate Negative volt come out cause Red LED stick bright next
but Green LED switch off down replace. But when check meet Negative Volt make
Red LED switch off but Green LED stick bright replace yes . The Diode 1N4002 be
formed protect turning pole electricity over. The detail is other , see in the
circuit please sir
LED Tone Generator by IC LM555
This circuit use test waves light receiver signal pulse
change LED1. For R1 and C1 be formed control the rate pulse of the circuit.
Besides equipment all value in the circuit will give the rate pulse about 600Hz.
Other detail see add in the circuit
Light Dark Detector Alarm by IC 555
Today we come to see the circuit detects the light by have a voice warn. When
meet the light or be become dark depend on using S1 ( follow the circuit ). For
this my circuit uses the integrated circuit IC 555 be pillar equipment again.
You can choose can use many the number be LM555 or NE555 or use the number
instead of eat the low beam be IC 7555 all right. For that circuit when S1 stay
in a position . And there is the light shines at LDR (Photoresistor) a
loudspeaker will utter. When S1 stay in a position and have no the light at LDR
loudspeaker utter also. This easy good circuit friends may have fun IC 555
detector light this please sir.
Basic Timer Control with NE555
As friends many take an interest the circuit about IC 555
which be integrated highly popular that circuit. I then lead the circuit sets
the time be Basic Timer Control with NE555 come to present again. By it
basically the base of the circuit sets the time work instruction easily initial.
Press S1 for a already moment liberate for initial setting the time (Timing
Cycle) Relay encouraged work (Pulled in). Until anniversary completed work. The
R1 and C1 control length of while delaied keep. If use the value C1 very the
time long ago go up This circuit meets to wasp Logic pulse with sir. Request
have fun the circuit sets the time this easily please sir
Tone Burst Generator by LM555
Friends take an interest try build Tone Burst Generator be
simple is. Try this circuit like sure because use
IC 7555 ,
highly popular again. Assure that not sure difficult press the the secretariat
of the senate S1 a loudspeaker will utter to come out immediately. When liberate
S1 already the sound may loud again next many second. The C2 and R4 control time
drag. The C1 control the frequency.( Use the integrated circuit IC 7555 use
power source a little more IC 555 very )The detail is other see in the circuit
request have fun
Tone Burst Generator please sir
DC to AC Inverter by IC 555 and TIP41 TIP42
This be basic AC inverter Circuit. Convenient for the initiator who have to
is extremely fond of something experience. Because of use IC 555 highly popular,
perform produce the frequency ,then enlarge with transistor NPN and PNP number
TIP41 and
TIP42 drive
the coil transformer. Get by can pay Voltage output about 120V to 230V at
frequency 50Hz. By have R4 perform control the frequency and should use. Voltage
supply about 5V to 15V the detail sees in circuit picture sir.
Watch-Dog for Telephones by NE555
Most of the telephone security devices available in market
are simple but quite expensive. These devices provide blinking or beeping type
line-tap/misuse indications. Quite often they do not offer guaranteed protection
against unauthor-ised operation. A very simple and uni- que circuit of a
telephone watch-dog to safeguard subscriber telephone lines against any fraud is
described here. This little circuit keeps continuous watch over the telephone
lines and sounds an alarm in case of any misuse. In addition it transmits a loud
tone through the telephone lines to prevent further misuse
Universal IR Controller for a PC by 74LS74,555
This
simple circuit allows you to record any IR remote control signal on your PC, and
then play it back. This is particularly useful if you want to control appliances
such as TVs, VCRs, CDs etc. from your computer. The device simply connects to
the parallel port of your PC. You can also use this circuit to analyze the
waveform from any IR remote control
Annoying high pitch noise generator by 555
This
is a simple high pitch noise generator circuit. It has a timer oscillator with a
frequency variable from 15khz – 30khz.
The circuit can be mounted in a
plastic box like I have done. The good thing about high frequency sounds is that
it is very hard to find where they are coming from. Also, the noise is very
annoying and irritating. The crystal speaker is the creamy coloured thing at the
bottom of the photo on the left
Alternate 555 Oscillator
This is a slightly simpler circuit than the one above. The circuit uses just
one resistor and one capacitor with the 555 timer IC to create a stable and
reliable oscillator with an output that it a true squarewave.
The formula for
calculating the frequency is:
f=1/(1.4*R*C).
The values in the formula are expressed in ohms, farads,
seconds and hertz. This formula is much simpler than that of the previous
circuit. With the values shown on the circuit, the frequency is calculated as
1050Hz, but like the previous circuit, this arrangement can operate at
frequencies up to around 500kHz
Basic 555 Timer Oscillator
The circuit on the left shows the standard
astable oscillator
circuit for the
NE555N IC. This si the basic circuit
that is shown in most component catalogues and other sources of 555 IC
information. With the components shown on the diagram, the output frequency will
be approximately 1kHz and the duty cycle 50-50.
…
Simple Pulse Generator by IC 555 Timer
This is a simple
pulse generator circuit
with
IC 555 timer.
Use for
digital Logic
circuit. IC 555 use voltage supply 5V to 15V.
The output’s frequency
is control by R1.
Detail more, Please read in this image circuit
4017 Led Pattern-Flasher
The circuit uses
a 555 timer oscillator to supply clock pulses of a variable frequency to the
4017 decade counter. The decade counter only needs to have three outputs so the
fourth output goes into the reset pin to start the cycle all over again. The
central red led is always on. Each row of four leds flash in sequence giving the
impression that the light is rotating. It is an idea that works very well giving
an eye-catching display. It will run continuously for three hours with a
standard pp3 battery
PBS Switch Debouncing by 555
This circuit will remove the transient spikes and contact bounces from a
non-latching push button switch.
Using a 555 timer as a monostable circuit, it is easy to build a good switch
debouncer circuit. There are many circuits for SPDT debouncing, but not many for
a normally open, push-to-make press button switch (PBS). The 555 monostable
gives an output pulse of around 20 msec with component values shown. The formula
for determining the output pulse is:
tout = 1.1 R1 C1
3-6V Xenon Strobe Light by IC 555 and IRF9Z20
This
circuit used to come as a kit from a surplus supplier, but probably isn’t
available anymore. It shows a few novel concepts such as using a 555 as a pulse
width modulator (PWM), and series/parallel camera flash transformers.
The 555
is set up as a pulse width modulator (the off (low) time being set by the
trimmer). The output at pin 3 is connected to the gate of the P-channel MOSFET
(IRF9Z20) through the 100R resistor to prevent parasitic oscillation of the
transistor. A low signal at pin 3 causes the MOSFET to turn on, thus the
potentiometer controls the output power, and somewhat the flash frequency, by
varying the duty cycle of the 555 and in turn the MOSFET
Frequency Divider by 555 and 4040
U1 7555 is a CMOS version of 555 LM555 pdf datasheet.
The 555 here is in
Astable Oscillator mode, C1 and C4 are decoupling capacitors 0.1uF value,
ceramic disc.
The output is around 100kHz, If C3 is plastic or mica the
frequency output will be stable with temperature. It is better to use a crystal
oscillator.
The 555 output is fed to clock input of 4040, the output of 555
will be a square wave, on every high to low transition (falling edge or negative
transition) the counter increments by one and the output is 12 bit binary.
If
input frequency is F the final output at Q12 is F/4096. The period T =
1/F.
If you make the 555 run at 1Hz, C3 around 7uF, Then this circuit becomes
a long duration timer, the Q12 period will be 4096 seconds or 68 minutes
A flyback converter high voltage supply by 555
The
circuit diagram of the flyback converter will hold no surprises (Fig.16).
Literally the only difference with the boost converter is that the inductor is
replaced by a transformer, and that the transistor has been replaced for a
BUZ21. The BUZ21 has a much lower on resistance (Ron=0.085 ohm) as compared to
the BUZ41A (Ron=1.5 ohm) but also a lower drain-source breakdown voltage (100V
versus 500V)
12VDC Negative Voltage DC Converter by 555
The circuit is very simple, and is easily made on Veroboard or similar.
Construction is not critical, and the schematic is shown in Figure 1
below.
Rectifier diodes should be ultrafast (UF4004 or similar), or you can
use 1N4148 signal diodes. Losses will be slightly higher if you use signal
diodes, or lower if you wanted to go to the trouble of using Schottky diodes –
the latter are not warranted in such a simple circuit (IMO). The zener diode is
to protect the circuit against transient overvoltage, and is optional
Using
only a standard NE555 timer and a few other parts, this circuit should be up an
running in about an hour. The 555 is configured as a minimum parts count astable
(i.e. no stable states) multivibrator, and runs at around 17kHz with the values
shown. The zener diode (D3) should be a 16V/ 1W type. Resistors are 1/2W carbon
film, and small caps may be polyester or mylar
100 Seconds Duration On Switch with Touch Control by 555
This is a touch control switch which keeps the circuit on about 100 seconds
after touching the plate connected to the 2 numbered pin. At the end of this
time duration, relay releases and the circuit gets to off position.
The
impedance of the trigger input of the 555 timer IC is very high and the
inductive voltage on the human body is enough to trigger it. The circuit works
based on this principle. You can use a piece of metal as a plate. The circuit
can be used in toy circuits, buzzers or any project that is suitable. You can
adjust the duration time by changing the R1 and C1 values
12V to 18V step-up DC converter by IC 555
This is a power source that creates a DC voltage higher than the voltage
feeding the it. It might be used to power your laptop (+18V) from a car battery
(12V ~ 13.8V). It is built using very ordinary parts that should be readily
available. Here are some specs:
Input voltage 9V ~ 15V
Output voltage 12V ~ 25V
Output current Max. 3A
@18V
Switching frequency 20kHz – 40kHz
Efficiency 65% – 95%
If you know these circuits, please skip the following. The circuit is a
step-up converter, and it’s workings can be explained by the main property of a
coil: its inductance. Imagine a current flowing through a coil. The inductance
will cause the current to continue running, even if the power supply that caused
this current is taken away. The voltage across the coil will take any value
required to keep the current running. This is why you can easily create sparks
with a coil, a spark is simply a current flowing at a very high voltage.
This
circuit flips between two states: ‘charging’ the coil with current, and dumping
this current into the output capacitor. The frequency at which this happens is
so high that only a small ripple remains at the output capacitor (10000uF). Here
is the circuit
Drive SCR thyristor by IC 555
This circuit gives a burst of pulses to fire 2 SCRs, when pin 4 is taken to
12V the SCR is turned on, to use this circuit you need 12V short pulses phase
shifted with respect to AC sine wave on bridge.
This way you can control the
bridge from near 0% to near 100% ON, that way battery banks can be charged,
electroplating can be done, current and voltage can be controlled with opamps,
thyristors are very rugged compared to transistors and MOSFETS in that order
555 timer pulse generator
To drive ignition coils is to use a 555 timer pulse generator. A 555
generates a square wave output that triggers the 2N3055. Adjusting the two
potentiometers and the value of the capacitor will change the frequency of the
output.
Flyback Transformer Based high voltage generators
Uses
a 555 timer IC to generate a 720Hz triangle waveform (at pin 2 of the IC). This
waveform is of about 50% duty cycle. This triangle waveform is compared to a
fixed voltage with a comparator, IC2. The fixed voltage can be varied by
potentiometer VR1. The output of the comparator is a 720Hz square wave of
variable duty cycle. The potentiometer must be adjusted so that Q2 is near to 0%
duty cycle (ie it spends the majority of the time off)
12V input, 12V battery charger by 555,7815
The charger consists of two stages: The first is a capacitive voltage
doubler, which uses a 555 timer IC driving a pair of transistors
connected as
emitter followers, which in turn drive the voltage doubler proper. The doubler
has power resistors built in, which limit the charging current.
The second stage is a voltage regulator, using a 7815 regulator IC. Its
output is applied to the battery via a diode, which prevents reverse current and
also lowers the voltage a bit. The resulting charge voltage is about 14.4V,
which is fine for charging a gelled or AGM battery to full charge, but is too
high as a trickle charger, so don’t leave this charger permanently connected to
a battery. If you would like to do just that, then add a second diode in series
with D3!
There is a LED connected as a charge indicator. It will light when
the charge current is higher than about 150mA. The maximum charge current will
be roughly 400mA
SOLID STATE TESLA COIL WITH 555 TIMER
Setting
the operating frequency with an integrated timer is easy and practical.
Following schematic is nothing more than the standard astable mode circuit
design with a classic 555. It requires only two resistors and a capacitor to set
frequency (with duty cycle of course) and another resistor to determine power
transistor’s base current, which you can find it’s optimal value experimentally.
I used 1K for R1, 2.2K for R2, and 10nF for C which made circuit to run nearly
at 27 kHz theoretically, at %60 high to %40 low duty cycle. You can quickly
calculate operating parameters from the resistance and capacitor values with a
small program that I’ve written
Ignition coil driver by IC 555 + 2N3055
Here is a very simple
circuit that will provide high voltage (15-40kV) sparks using a common ignition
coil. The input is 12VDC at around 5 to 6 amps. Mine produces sparks that are
about 3/4″ to 1″ in length. A 2N3055 NPN power transistor is pulsed with a
square wave signal that comes from the 555 timer IC. The frequency of the pulses
depends on the resistors between pins 7 and 8 and between pins 7 and 6. The
pulse is also dependent on the capacitor. You can experiment with these values.
Try inserting a smaller capacitor to raise the frequency. At different
frequencies the sparks will change certain characteristics. At a high frequency
the sparks will get fatter but shorter in length. At lower frequencies the spark
maybe longer but thinner. I assembled my project on a solderless breadboard. You
can use whatever you like. The capacitor should be a tantalum or mylar type, but
this is not absolutely necessary. A ceramic type should work fine just as long
as the temperature is not too high around it
Power On Delay Circuits by 555
These circuits will delay the application of power to a second circuit using
mechanical relays or transistors. Other output control devices could also be
used.
Efficient flyback driver by IC 555 + IRF510
This is a good and fairly
efficient flyback driver circuit. All parts can be obtained easily from Radio
Shack, including the MOSFET. This circuit uses a 555 timer IC to pulse a 2N2222
with square wave at a frequency that is set by the capacitor and the
potentiometers. The 2N2222 then drives the gate of the MOSFET and the MOSFET
delivers the pulse to the ten turn winding on the flyback. If you build this
circuit you will have to adjust the potentiometers until you get the longest arc
possible. The circuit will run from +12VDC to +15VDC at about 3A. The MOSFET
must be heatsinked! This is important if you are going to run this for any
decent amount of time. If the MOSFET still gets too hot or burns up you can
place a 4 ohm (for a +12V supply) or a 5 ohm (for a +15V supply) between the
source lead of the MOSFET and the primary on the flyback. Make sure that these
resistors havethe proper power rating for the voltage and current that they will
be carrying. The flyback should be wound with ten turns of 14-16 guage solid
wire. Anchor it in with some electrical tape. Any previous primary windind
should have already been removed before winding the new one
Touch Switch ON-OFF by IC 555
The modern mechanic switches are improved concerning of old technology. We
need however many times to replacement some old switch or to check currents
bigger than the durability of certain switches or simple we need something with
modern appearance. For he and different reasons is essential the up circuit. He
is simple in the manufacture and the materials that use they exist everywhere.
This based in the known 555, which drives a relay of which the contacts play the
role of switch. The metal surfaces can have what form we want, but it should
they are clean and near in the circuit. In order to it changes situation it
suffices touch soft somebody from the two plates. Plate JF1 in order to the
contacts of RL1 close [ON] or plate JF2 in order to the contacts of RL1 open
[OFF]. The current that RL1 will check depended from his contacts. The Led D2
turns on when the switch they are in place ON and the contacts of RL1
closed.
Part List
R1-2=3.3M 1/4W 5% D1=1N4148 RL1=12V Relay [Your choise
]
R3=10K 1/4W 5% D2= Red LED 3 or 5mm. JF1-2=Metal Plate
R4=1K 1/4W 5%
Q1=BC547
C1=10nF 63V MKT 5% IC1=555
Infrared Remote Control System Receiver
Infrared Remote Control System Receiver By IC
DigitalThis is a single channel (on / off) universal switch that
may be used with any Infra Red remote control that uses wavelengths between
850-950nm.
Notes:
Any “button” of any remote control may be used to work this
universal switch. The button must be pressed for two seconds (determined by R3
and C2) before the relay will operate. Once operated the circuit will remain in
this state (latched) until reset. To reset, any button is pressed and held for
the delay.
For example, if you were watching TV, and your set was tuned to
Channel 3, you could press and hold the TV remote controls channel 3 button for
two seconds. That way the TV viewing would not be affected and the relay would
activate. You can connect anything to the relay, for example a lamp, but make
sure that the relay contacts can handle the rated voltage and
current.
Circuit Operation:
IC1 is an Infra Red module. IR modulated
pulses are received and buffered by this IC. It has a standard TTL output, the
output with no signal is logic 1. One gate of a CMOS inverter and drives Red
LED1 as a visible switching aid. Another gate buffers the signal and applies it
to the time constant circuit, comprising R3,C2,R4 and D1. C2 charges via R3, and
discharges via R4, D1 prevents quick discharge via the low output impedance of
the CMOS buffer
Voltage doubler with IC 555
parts:
U1 NE555 timer IC
R1 2.2k ohm resistor
R2 15k ohm
resistor
C1 0.01 uF ceramic capacitor
C2, C3 220 uF electrolytic
capacitor
C4 470 uF electrolytic capacitor
D1, D2 1N4002 diode
all resistors are 5 or 10 percent tolerance, 1/4-watt
all capacitors are
10 percent tolerance
this circuit rougly doubles
the voltage of the input, however the current output is low. doubled output is
at ‘V source
Nagative voltage generation using 555 timer
This
is Circuit build Nagative voltage generation Form IC 555 timer ,It is Hot IC and
Easy to Use
OR gate with two IC 555
how to OR gate two 555,
when one 555 cycles at a low frequency a valve turns on an off, the second 555
stretches the ON duration of the pulse with a diode OR gate, this OR output uses
sample and hold to get the stable analog data from a sensor after the actuator
has gone OFF, this ensures correct reading
Generating -5 Volts From a 9 Volt Battery With IC 555
A 555 timer can be used to generate
a squarewave to produce a negative voltage relative to the negative battery
terminal. When the timer output at pin 3 goes positive, the series 22 uF
capacitor charges through the diode (D1) to about 8 volts. When the output
switches to ground, the 22 uF cap discharges through the second diode (D2) and
charges the 100 uF capacitor to a negative voltage. The negative voltage can
rise over several cycles to about -7 volts but is limited by the 5.1 volt zener
diode which serves as a regulator. Circuit draws about 6 milliamps from the
battery without the zener diode connected and about 18 milliamps connected.
Output current available for the load is about 12 milliamps. An additional 5.1
volt zener and 330 ohm resistor could be used to regulate the +9 down to +5 at
12 mA if a symmetrical +/- 5 volt supply is needed. The battery drain would then
be around 30 mA
Relay Timer switch By IC 555 and 741
In Fig.1 see a 100 second delayed turn ON relay RL1 switch, if plug power
+12V in circuit. In Fig.2 see a two range 6-60 second and 1-10 minute auto turn
off relay timer circuit, with 555.
PartR1=1 Mohms C4=100nF 63V IC2=LM555
R2=330 Kohms
C1-2=100uF 16V RV1=470 Kohms pot.
R3=680 ohms C3=1000uF 16V RL1-2=12V >120
ohms Relay
R4=2.2 Kohms D1=1N4148 S1-2=Push button n.o
R5-7=4.7 Kohms
D2-3-4=1N4001 S3=2X2 switch
R6=47 Kohms Q1=BC214
R8-9=22 Kohms
IC1=LM741
lead acid battery Charger 6V -12V By 555 and LM340
Here is circuit lead acid battery Charger 6V
-12V.
I use IC 555 and LM340. Read Detail more in image circuit
PWM Speed Motor Controller By IC 555
This 555 timer based PWM controller features almost 0..100%
This 555 timer based PWM controller
features almost 0..100% pulse width regulation using R1,
while keeping the
oscillator frequency relatively stable. The frequency is dependent on values of
R1 and C1,
values shown will give a frequency range from about 170 to 200 Hz.
Any 555 chip will do, CMOS is fine as well.
Diodes are not critical, I used
1N4148. Total cost of parts is about $2. As the whole thing is quite
trivial,
it’s very easy to build on prototyping board like I did (as you can
see, one of capacitors –
C1 is replaced with different value, 0.047 uF to be
precise
Inverts to Negative From Positive Voltage by IC 555
This simple circuit is a good solution to the powering a dual supply op amp
from a single battery problem. The circuit simply takes a positive voltage and
inverts it. It uses only one 555 timer and a few other passive components, so it
doesn’t add much in the way of size and cost to a project.
SubstitutionsR1 1 24K 1/4 Watt Resistor
R2 1 56K 1/4
Watt Resistor
C1 1 3300pF 25V Ceramic Capacitor
C2 1 47uF 25V Electrolytic
Capacitor
C3 1 10uF 25V Electrolytic Capacitor
D1, D2 2 1N4148 Silicon
Diode
U1 1 555 Timer
MISC 1 Wire, Board
IC Digital 555 Pulse Generator
Circuit : Miroslav Adzic – Serbia & Montenegro
Description:
A 555 pulse generator circuit with a difference, the initial
pulse is tailored by additional circuitry to match the duration of subsequent
pulses.
single pulse gen
Notes:
The NE555 and the First Pulse
The first positive pulse from a
classic 555-based oscillator is always 1.6 times longer than the following
pulses. The difference is caused by the fact that only during the first cycle C2
starts charging up from 0 V. This is generally not a problem, but sometimes this
first pulse just should be the same length as the rest – at least
approximately
Timer Plus Relay by IC 555
This be Timer Plus Relay Circuit by IC 555. When see the circuit also a
little equipment. By the value R1 and C1 perform set the time give Relay work 11
long ago second. When we begin to encourage the circuit by switch press 2 pin
with a leg Ground note: Relay 6V 500ohm. Use current 12mA. The detail is other ,
see in the circuit adds.
Red Alert Startrek Alarm by IC 555
The third circuit simulates the Red Alert siren from the TV show Star Trek.
It uses two 555 timers in the circuit. The 555 on the right is wired as an alarm
tone generator and the second 555 timer on the left is wired as a 1.5 second
non-symmetrical astable that generates a fast rising but slow falling saw tooth
waveform. This waveform is buffered by the transistor and used to frequency
modulate the tone generator and making its frequency rise slowly during the
falling parts of the saw tooth but collapse rapidly during the rising part of
the saw tooth. The output starts as a low frequency, rises for 1.15 seconds to a
high tone, ceases for .35 seconds and then repeats the cycle.
American Police Car Siren by IC 555
The second circuit simulates the siren of an American police car. It uses two
555 timers in the circuit. The 555 on the right is wired as an alarm tone
generator and the second 555 timer on the left is wired as a low frequency
astable timer which generates a ramp waveform of about 6 seconds that is
buffered by the transistor and again used to frequency modulate the tone
generator. The transistor is used to help strengthen the signal to the
speaker
British Police Car Siren by IC 555
This month I am making 3 different types of siren circuits based on the 555
timer. The first circuit simulates the siren of a British police car. It uses
two 555 timers in the circuit. The 555 on the right is wired as an alarm tone
generator and the second 555 timer on the left is a 1 Hz astable multivibrater.
The output of the left timer is to frequency modulate the right timer. This
causes the right timers frequency to alternate between 440Hz and 550Hz at a 1 Hz
cyclic rate. The transistor is used to help strengthen the signal to the
speaker.
Circuit Egg Timer By LM555
This is Easy and Mini Timer Circuit ( Egg Timer) by IC 555.
Alarm by
Buzzer.
This be mini timer circuit that interesting. I calls that
Circuit Egg Timer. By use integrated highly popular circuit number LM555 or
NE555 or the number replaces. By VR1 use control the time of the circuit sets
the time. When expire buzzer as a result make a noise warn hear. For S1 use for
choose that Time or Stand. The detail is other request friends see in the
circuit better sir
Circuit Door Buzzer by NE555 + LM386
Someday I goes to visit a friend. He begs me helps to seek electric bell
front door circuit. In model to be simple, use the a little equipment. I then
choose the Door Buzzer circuit this give. Because of use , IC NE555 produce
electric bell sound and use IC LM386 for amplify talk at one time. For R1 use
fine decorate the sound as you like it. request have fun this circuit.
Table Lamp Circuit by IC 555
If you want Power Lamp Flasher at give electric tall power. As a result try
out Table Lamp Circuit the this. It uses the integrated circuit NE555 be pillar
equipment. Control the rate blinks of Lamp. Get , for the transistor power make
Lamp 12V electric tall power about 20W or use current 1.6A stick bright get. The
Q3 can use replace get many the number such as TIP41 or H1061 or MJ3055 or will
use 2N3055 numbers all right sir. The detail is other see in the circuit
LED Chaser by IC 4017 + IC 555
I believes in that extremely amateur electronics many you, may ever build the
LED flasher or light blinks or the LED Chaser prevent come to already. Today I
begs for to advise the circuit LED Chaser, by have LED show 10 amounts together.
blink stick bright chase go to continually. By have IC 4017 precede at drive a
tube LED all. Which its work be Counter circuit good just this besides. Still
have IC 555 wait for feed Clock with then can fine the speed of the winking with
VR1 good easy. The detail is other see in circuit picture better.
Circuit LED Chaser by IC 4017 + IC 555
Simple Timer by CA3140 + NE555
This be the circuit sets the time to model is simple,at can
fix the time had long ago and have tall good accuracy. By use pillar equipment
be IC CA3140 for fix time mouth and NE555 perform sound electric bell origin. By
we can fine time value done to a turn VR1 can fine since 10 second arrive at 3
hour. When the time expires will have an electric bell that a loudspeaker. For
the equipment that should choose specially. Be C1 100uF 16V values should are a
kind Tantalum. Because tall quality more Electrolytic. The moderately but if no
enough replace can sir. Request friends have fun the circuit sets the time this
please sir
Door buzzer with 555
This is easy circuit buzzer. It use IC 555, Speaker 25 -80
OHM.
I demolishes a store-room , see old loudspeaker and other
equipment a little again. Then born the though builds Door Buzzer by use , IC
555. Perform sound electric bell origin. When press S1 as a result have a voice
fair loud. This circuit almost must not do anything. Because divisible Amen!
should use 25-80ohm size loudspeakers. will make good sound use force against
electricity low work or economize the electricity. You will may use 9V batteries
all right sir
IC 555 LED Flasher
This is easy LED Flasher circuit. It use IC 555 drive LED
display.
A
younger brother of me just begin take an interest the electronics. Want to try
build Simple LED Flasher Circuit. I then advise this circuit , because of use
the integrated circuit timer highly popular type IC NE555 or LM555 very the
circuit is Pulse Oscilator the frequency is low. From the circuit will think to
use LED 2 pcs wink alternate. Detail , have no chicken many mites. Invite a
friend sees in circuit picture better sir
Single IC Organ By IC NE556
Single IC Organ By IC NE556When you will think to build
Single IC Organ Circuit the some one. I begs for to advise this circuit ,
because use IC NE556 or LM556. Which within its structure is like have the
integrated circuit IC 555 arrive at 2 together follow my circuit.
Control by Keyboard contacts and SW1 Tremolo ON/OFF as a result
can choose music pitch that can want.The detail about mini Organ Circuit the
this. Can see in circuit picture sir.
