This circuit for controlling high power LEDs (up to 2A) is from a General Electric documentation from 1970. The circuit serves to modulate a transmitter in PWM. The circuit serves as a shield.
This circuit was found in a 1969 CQ magazine. It is intended for coupling telephones to radio...
This 3-component circuit uses an analog indicator. We found it in an old publication....
This circuit was found in na old latin american magazine. The circuit uses two germanium...