This circuit was found in a Popular Electronics of the 1980s. The microammeter may be the lowest current range of a multimeter. The antenna is telescopic.
Found in 1967 General Electric documentation, this circuit is intended for the control of...
We found this circuit in an English publication from 1980. It memorizes the peak of the input...
This 200-mW amplifier uses one of the first commercial power transistors. The circuit is from a...