SIMPLE FM TRANSMITTER RANGE – UPTO 3 KM

FM TRANSMITTER RANGE – UPTO 3 KM

             This F.M Transmitter has 3 RF stages. A variable frequency V.H.F. Oscillator, a class C.R.F. driver and a class CRF amplifier with harmonics filter. Block diagram of transmitter is shown below .

             Power supply is 9 to 12 volts dc. RF output power is 150 mill watts. With telescopic antenna (75 C.M) range is up to 1 K.M . Range can be extended upto 3 KM, BY USING multi element yagi antenna having dipole, reflector, director elements.

               Frequency of transmitter can be set within 88-108 MHz F.M band by adjusting the first trimmer. Adjust output trimmer for maximum range of transmission.

              To power  this transmitter user 12 Volts battery. Do not user mains derive supply.

               Suggested Yagi antinna design using aluminium rods is shown here. Use 75 ohm Co-axial cable between transmitter and antenna. Inner wite of cable is connected to output of transitter and braid is connected to ground of P.C.B.

YAGI ANTENNA

Do not switch on transmitter without connecting proper antenna.

PARTS LIST

RESISTOR                             SEMICONDUCTORS

R1           -10K                       Q1          -BC548

R2           -15K                       Q2 -Q3  -C2026 / C2570

R3-R4    -4K7                       TRI – 1,2,3 – 22PF

R5           -68E                       MIC        - 2 PIN Cond. Mike

R 6          -2K2                       L1            - 7 TURN 22 SWG

R7           -22E                       L2            - 6 TURN 22 SWG

R8-         -1K                         L3            -5 TURN 22 SWG

R9           -10E                       L4            - 5 TURN 22 SWG

Data sheet of c 2024

 Data sheet of c 2570

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HOW TO REPAIR CFL BULB

CFL BULB  does not glow

 

CFL BULB REPAIRING TUTORIAL

 

Check TP1 AND TP2 ac 230 v comes to bridge rectifier or not.

When comes  230 v ac  then check TP3 AND TP4 300 v dc in filter capacitor C4 3.3 uF /400v .

If not coming then check bridge rectifier  and C4 .

When  comes 300v dc  , then check  TP 5  here around 125-150v dc is coming.

If not coming then check  Q1,Q2-  MJE 13001, R1,R3 – 1 Ohems, R2,R5 – 20 Ohems and its related component.

After 125v DC coming in TP5 if CFL BULB not glow then check CFL TUBE two side coil, and chopper tranfermer.

After this tube already glow , if does not glow then see this tube starting point only glow in low light but not complete not glow then, check  C3 2n2/630 v is shorty.

Replace this C3 and you done.

.....................................................ENJOY.........................................

If any question about this you can comment me, and i will reply you.....................


ANOTHER CFL BULB CIRCUIT DIAGRAM WITH DETAILS

BIGLUZ 20 WATT       BROWNIEX 20 WATT       EUROLITE 23 WATT      IKEA 7 WATT 

IMMEDIATELY 25 WATT      ISOTRONIC 25 WATT     LUXAR 11 WATT    LUXTEK 8 WATT  

 MAYWAY 11 WATT       MAXILUX 15 WATT      OSRAM 11 WATT     OSRAM 21 WATT   

OSRAM DULUX STAR 11 WATT      PHILIPS 11 WATT      PHILIPS GENIE 11 WATT  

 PHILIPS 14 WATT     POLARIS 11 WATT

HOW TO DISTRIBUTE CABLE TV CONNECTION TO TV

WHEN WE GET FINAL SIGNAL AFTER CONTROL ROOM 200 MTR AHED CONNECT A ANATHER AMPLIFIER FOR RESON, GET BETTER SIGNAL FROM 200MTR WIRE LOSSES.

OUT PUT FROM FIRST AMPLIFIER GAIN =90 DB , SLOPE = 95 DB

AFTER 200 MTR THIS CABLE LOSS ABOUT GAIN 20= DB, SLOPE = 25 DB

SO RESULT WE GET NOW GAIN- 90 DB-20 DB = 70 DB

                                                SLOPE- 95 DB- 25 DB =70 DB

NOW HOW TO INCRESE THIS SIGNAL GAIN

THIS INPUT GIVE TO NEW ONE AMPLIFIER

AND ADJUST THIS GAIN SLOPE CONTROL UNTIL OUT PUT

                                                                GAIN – 90 DB, SLOPE – 95 DB

AFTER THIS, THIS PROCESS WILL CONTINUE FOR EVER

MEANS EVERY 200 MTR DISTANCE CONNECT A AMPLIFIER

AND GAIN SLOPE ADJUST LIKE UPPER METHOD