This circuit was found in Motorola documentation from the 1980s. The components are of the time, not currently common as operational and opto receiver.
This simple circuit tests both monophonic and other two-wire audio cables. The circuit is powered...
This circuit is from a 1980s documentation, but the configuration can be applied to most modern...
We found this circuit in an American documentation from the 90s. The circuit produces a 1 kHz...