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 circuit for PC and which can also be used with microcontrollers was found in an English...
This circuit is from National Semiconductor documentation. The operational amplifier is of the...
In this circuit we have the voltage multiplied by 5, obtaining between 50 and 80 V output when the...