The voltages in an adjusted range in the trimpots are indicated by 3 LEDs. The LEDs indicate when the voltage is below the range, above the range and in the range.
This circuit was found in a 1968 Hughes documentation. The transistors are from that time. The coil...
The idea of this 1982 Experimenters Handbook circuit is to generate an RF signal in L2 that can be...
This bistable circuit that drives a relay with a pushbutton was found in the March 1pp6 issue of...