This old circuit from a documentation from the 70s disconnects a TV from a signal obtained on the TV itself, detecting when the tuned channel goes out of the air.
This circuit with an industrial standard 4-20 mA interface uses a KPZ20G pressure sensor but can...
This inverter with the 555 IC provides a high voltage output, but very low current. We found it in...
) The purpose of this circuit is to increase the sensitivity of an indicating instrument. We found it...