Two-terminal-touch-switch


Posted on Sep 14, 2012

This circuit requires the bridging of two circuits to activate the electronic switch. That circuit does not require a 60-Hz field to operate and can be battery or ac powered. The two-pickup terminals can be made from most any clean metal; they should be about the size of a penny. The input circuitry of the two-terminal touch switch is a high-gain Darlington amplifier that multiplies the small bridging current to a value of sufficient magnitude to turn on Q3, supplying power to LEDl.


Two-terminal-touch-switch
Click here to download the full size of the above Circuit.

If a quick on and off switching time is desired, the value of Cl should be very small; if a long on-time period is required, the value of Cl can be increased.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

TDA1524 Stereo Tone Control
Offline-converter
Keyless Lock
PWM Speed Rotation Forard-Reverse and Regenerative Braking
the octal phono preamplifier
Cheap And Cheerful Transistor Tester
Arduino GH-2 integration for time lapse
DC brush motor driver circuit diagram
Field scanning circuit circuit and sawtooth waveforms
5W Valve RF Transmitter circuit



Top