Found in a 70s RCA manual, this circuit uses transistors from the era. Equivalent types can be used such as TIP31 for Q1 and BD135 for Q2.
This 1 A circuit was found in a Philips documentation from 1966. The transistor is of the time,...
The audio signal generated by the oscillator stage is amplified by an LM380 and reproduced with...
This circuit is from a 1965 General Electric hobby manual. The circuit can be assembled with...