This circuit was found in the 1961 RCA tube manual. The circuit includes a power supply stage.
This circuit was found in a Radio Electrnics of the 90s. The SCR can be any of the 106 series...
This 90's Radio Electronics circuit uses uncommon integrated circuits today. The circuit is...
We found this circuit in an old Mullard (Philips) documentation. The load must be according to the...