We found these circuits in a Popular Electronics from the 90s. The circuit has a simple low power version and a higher power version with MOSFET (VMOS) of the time.
This small stereo amplifier for headphones was found in a documentation on integrated circuits from...
This circuit was found in a 1965 General Electric documentation. It is intended for reception of the...
This circuit, already explored in other articles on this site, consists of a sequential timer in...