■ 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.
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