Simple Touch Alarm Circuit - touch the sensor of the alarm with your finger and it starts beeping goes on for some time and then stops touching it again and it goes again this touch the sensor of the alarm with your finger and it starts beeping goes on for some time and then stops touching it again and it goes again touch the sensor of the alarm with your finger and it starts beeping goes on for some time and then stops touching it again and it goes again this little and flexible circuit consists of a touch sensor and a directly coupled transistor lifier with a small loudspeaker as the output load two sensor strips of metal are mounted side by side touch the sensor of the alarm with your finger and it starts beeping goes on for some time and then stops touching it again and it goes again brief description this simple touch sensitive alarm is developed by using ne 555 timer ic operated as a monostable vibrator this touch.

alarm circuit simple touch sensor circuit now simple touch sensor circuit gives the connections at the two exposed ends one connection goes to the ve supply and another goes to the base terminal of you can also remove the 470 ohms resistor and led for making the circuit more simple you can fit the whole circuit in a very small box with the two or four small coin size lithium batteries this simple touch switch is developed by using 555 timer ic operated as a monostable vibrator here the stable stage is low so the timer outputs low after the trigger is removed basically in this circuit we will have a led which turns on when we touch a pin of timer the led will be on for the time during which the trigger is present once the trigger is removed the led turns off





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