Touch Switch Project
THEAFS ARE ATTRACTED TO EXPENSIVE THINGS
WHEN THEY COME IN OUR HOUSES. WE CAN PROTECT OUR PRODUCT OR THING BY
MAKING THEM TOUCH PROOF OR WE CAN STOP ANY UNIDENTIFIED PERSONS ENTRY IN
OUR HOUSE BY MAKING DOOR AND WINDOW TOUCH PROOF.THIS CIRCUIT ALERT US
WHEN ANY THEAF COME TO STOLE PRODUCTS FROM OUR HOUSE OR TOUCH ANY
METALLIC THING AT DOOR / WINDOW OR IN SIDE . WE CAN USE THIS CERCUIT TO
PROTECT OUR CAR OR BIKE BY MAKING THEM TOUCH PROOF.
AS WE HAVE DISCRIBE ABOVE THIS PRODUCT
GIVE ALARM WHEN ANY HUMAN BODY TOUCH ANY OF THE METTALIC THING WHICH ARE
PROTECTED BY THIS CIRCUIT. THIS PROJECT IS WORKING ON TWO TRANSISTORS
WHICH MAKE COMPLIMENTORY PAIR DIRECT COUPLED AMPLIFIER. THIS CIRCUIT BASICALLY A AUDIO OSILATOR FOR OSILATION WE USE COLLECTOR OF TRANSISTOR BC558 WHICH IS CONNECTED TO THE BASE OF TRANSISTOR BC 548 VIA RESISTANCE 18 K .01 or .02 MFD CAPACITOR . TRANSISTOR BC-548 IS WORKING AS A PREAMPLIFIER.
WHEN ANY HUMAN BODY TOUCH THE TOUCH SENSOR WHICH IS CONNECTED TO BASE OF TRANSISTOR BC-548. THIS TRANSISTOR CONDUCT WITH HUMAN SKIN CONDUCTANCE . WHEN TRANSISTOR BC-548 START CONDUCTING IT’S FORCED TO TRANSISTOR BC558 TO START CONDUCTING . SO WE GET ALARM SOUND FROM SPEAKER. WHEN WE TAKE BACK OUR HAND THEN DOES NOT CONNECTED TO BASE OF TRANSISTOR BC-548 . SO IT’S DOES NOT CONDUCT WE DO NOT GET THE ALARM SOUND.
WHICH MAKE COMPLIMENTORY PAIR DIRECT COUPLED AMPLIFIER. THIS CIRCUIT BASICALLY A AUDIO OSILATOR FOR OSILATION WE USE COLLECTOR OF TRANSISTOR BC558 WHICH IS CONNECTED TO THE BASE OF TRANSISTOR BC 548 VIA RESISTANCE 18 K .01 or .02 MFD CAPACITOR . TRANSISTOR BC-548 IS WORKING AS A PREAMPLIFIER.
WHEN ANY HUMAN BODY TOUCH THE TOUCH SENSOR WHICH IS CONNECTED TO BASE OF TRANSISTOR BC-548. THIS TRANSISTOR CONDUCT WITH HUMAN SKIN CONDUCTANCE . WHEN TRANSISTOR BC-548 START CONDUCTING IT’S FORCED TO TRANSISTOR BC558 TO START CONDUCTING . SO WE GET ALARM SOUND FROM SPEAKER. WHEN WE TAKE BACK OUR HAND THEN DOES NOT CONNECTED TO BASE OF TRANSISTOR BC-548 . SO IT’S DOES NOT CONDUCT WE DO NOT GET THE ALARM SOUND.
Same Circuit can be use as Touch Alarm, Rain Alarm etc
Circuit Diagram of Touch Switch / Touch Alarm / Rain Alarm
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