We found this circuit in the November 1984 Radio Electronics magazine. The base frequency is given by C1. The power supply can be between 3 and 12 V.
This circuit was found in a 1964 MOSFET applications manual. The circuit uses period general...
This circuit is from a Japanese documentation from 1971, using transistors of the time. The...
This circuit uses Only passive components and have to be plugged to the input of an audio...