This circuit was found in an American documentation from the 80's. The components are from that time. It provides a variable output of 18 to 30 V with a current of 200 mA.
We found this circuit in a 1988 documentation, but all the components used are still common today....
This variable high frequency oscillator circuit was found in an old English documentation. The...
This crystal fundamental frequency oscillator can operate at frequencies up to a few tens of...