The integrated circuit of this amplifier is not very common today. The output transistors can be TIP31 and TIP32 in heat radiators. The circuit is from the 1977 National Semiconductor Audio Handbook.
This very simple amplifier was found in the Philips Databook of 1990. The circuit is suitable for...
This interesting circuit was found in an English documentation. It generates sound similar to...
Indicated for telegraphy practice, this circuit was found in the Radio Electronics magazine of...