Found in a 90s Popular Electronics, this circuit checks if a remote-control transmitter is emitting signals. The sensor is a general-purpose type found in many electronic devices.
This circuit uses a capacitor that depends on the frequency of the crystal. We found it in a 1967...
This circuit consists in a full-wave bridge rectifier or Graetz Bridge as its is also called. The...
This stair generator uses an R/2Fl network to determine the amplitude of the steps. This circuit...