This power supply was found in a RCA publication from the 1970s. The circuit uses transistors from that time. Modern equivalent transistors can be used.
This 80s signal follower makes use of an audio amplifier of the era. The circuit can be adapted to...
This circuit may be modulated by a very low frequency signal, for example to obtain the vibrato...
We find this circuit in an American manual from the 80's. The circuit can be implemented with more...