We find this circuit in American documentation from the 1980s. It consists of a frequency folder using a varicap. The capacitors and coils depend on the frequency of operation.
This simple 15 V power supply was found in an article describing an assembly in the January 1987...
This amplifier was found in the November 1973 issue of Radio Electronics magazine. The power...
The circuit is from the Linear Application Handbook. The resistors determine the voltage applied to...