Plate Touch Sensor Circuit

Posted on Dec 22, 2012

This system operates on the principle that capacitance loading of an oscillator will lower its frequency. When a foreign body comes into contact with touch plate, the frequency of Ul is lowered.

Plate Touch Sensor Circuit
Click here to download the full size of the above Circuit.

This removes the oscillator signal from Ul from U2`s passband, which causes U2 to lose lock, turns off the LED, and causes the collector of Ql to go low.

Leave Comment

characters left:

New Circuits



Popular Circuits

Guitar Overdrive circuits
Low Voltage Step-Down Converter
amp variable output switching regulator lm195
switching loads with MOSFETs
Active Shortwave Antenna PCB
CW Practice oscillator
Implementing A Sewing Machine Controller With An Mc9rs08ka2 Microcontroller
Micropower Low Noise Boost Converters with Output Disconnect
CD4541 circuit diagram of Ni-Cd battery is automatically charged
Third batch start and stop cycle control circuits
Simple deep searching metal detector circuit