This circuit for audio signals was found in the March 1990 Radio Electronics magazine. The circuit uses a unusual optocoupler that can be replaced with an equivalent one.
This two transistor audio amplifier stage was found in a publication of the year 1968. The...
June 2016 - It can be obtained from Mouser Electronics this new chip for motor control, motion,...
This circuit is from an old American publication. The indicated transistor is oversized as the 15 V...