This commercial receiver from the year 1958 uses two AA cells as Power supply. The circuit is intend to receive MW station and the transistors are germanium types not easy to find today.
The circuit shown in the figure shuts off a load when the voltage drops below the value determined...
September 2017 - Littelfuse's Polyswitch SMD Resettable PTCs can now be purchased from Mouser...
This simple light meter or photometer circuit uses an analog indicator of 0-1 mA. Power is...