This passive circuit was found in a 1980s documentation. The circuit serves to indicate the balance or balance between the channels of a stereo amplifier.
This simple circuit uses small speakers for both listening and speaking (microphone). The feeding is...
This circuit was found in an Argentine publication from 1973. It uses a common AM coil (50 + 50...
Found in a 1970 documentation, this SCR bistable can be implemented with modern equivalent SCRs. Observe...