Touch Sensitive Alarm Circuit Diagram

Description

                Circuit showing a Touch Sensitive Alarm .Here i have used bc 548 transistor for switching and bc 107 for sound generation
.You need a power supply

Click here to view the power supply circuit diagram

Components Required

 Resistor

            680R ,100 K

 Transistor

             BC 548, BC 107 - 2

Loud Speaker

Copper plate

Source by : http://www.electronics-circuits.in/2012/03/touch-sensitive-alarm-circuit-diagram.html#more

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TOUCH SWITCHS

TOUCH SWITCH 1

This circuit detects the skin resistance of a finger to deliver a awfully tiny current to the super-alpha try of transistors to show the circuit ON. The output of the "super transistor" activates the BC 557 transistor. The voltage on the highest of the world is passed to the front of the circuit via the 4M7 to require the place of your finger and also the circuit remains ON.

 To turn the circuit OFF, a finger on the OFF pads can activate the primary transistor and this may rob the
"super transistor" of voltage and also the circuit can close up.

TOUCH SWITCH-2

This circuit detects the skin resistance of a finger to show the circuit ON for concerning one second. The output are often taken to a counting circuit. The circuit consumes no current when in quiescent mode:

 

 

http://streampowers.blogspot.com/2012/07/touch-switchs.html 

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