The diagram shows a tone control with the LM381 IC. The circuit is from a Radio Electronics from February 1990. The power supply is single.
This circuit was found in an American 1980s documentation. PUTs are rare today. Capacitors C1 and C2 are...
This circuit was found in a 1966 EEE. What it does is it converts the logic levels of 0 V and +4 V...
This circuit for controlling high power LEDs (up to 2A) is from a General Electric documentation from...