This circuit is from a documentation from the 70s. The circuit uses logic gates of the time, which in many cases were arrays of transistors allowing use as audio amplifiers, as in this case.
This circuit was found in a 1973’s Japanese magazine. It uses transistors of the time and is...
This cassette player motor speed control was found in the January 1991 issue of Radio Electronics...
This circuit was obtained in a 1982 English magazine. The purpose of this circuit is to make an...