This touch switch uses components that have easy-to-obtain current equivalents. The power supply must be isolated and the cable to the sensor must be short.
This circuit has an automatic dynamic gain control in a range of 6 dB to 40 dB. We found it in...
This circuit can be used as an answering password system in a store, office, or other location....
This circuit has a sensitivity of 200 mV providing an RMS power of around 4 W for a load of 8 ohms...