This circuit was found in the February 1971 issue of Radio Electronics magazine. It is designed to power the previous circuit, providing a maximum current of around 50 mA.
This circuit for frequencies of 20 to 2 kHz was obtained in English documentation from 1966. The...
The oscillator of this circuit operates around 8 MHz, but the output will be at a frequency three times...
This circuit with transistors of the time was found in the magazine Radio Electroinics of June of...