This small 1 W amplifier uses a Motorola integrated circuit from the 1970s. The integrated circuit used is uncommon today and the power supply does not have to be symmetrical.
The purpose of this 1985 circuit is to make the sound test of type 106 SCRs (MCR106, TIC106,...
This circuit with its light source was found in American documentation two years 70. Or...
This static switch circuit appears elsewhere on this site from other sources. This was obtained from a...