This circuit is a four-quadrant multiplier using an LM3900. The circuit was found in the July 1988 Radio Electronics magazine.
This switching boost regulator, which provides a 24 V output from a 12 V input, was found in the...
This switch or band selector for receivers was found in a Popular Electronics from the 1990s. The...
This power inverter or voltage inverter generates high voltage from 24V and 5V supplies. We found...