This circuit was found in documentation from the 1980s. It is powered by the audio signal that must be cut. Transformers are the critical components and transistors are 2N2222.
This Philips circuit of the 70's makes use of components of the time. The DZD40 is an uncommon...
This is the basic configuration of the TDA200. We found this application in an article in the...
Using 18 or 24 MHz crystals, this circuit is intended for producing reference signals with...