This simple circuit applies to any sensitive SCR. We found it in 1982 Maplin documentation.
This circuit converts a positive CMOS supply voltage to a negative one. We found it in a 90s...
We found this high gain circuit with the LM381 preamplifier in a Radio Electronics from February 1990....
This QST circuit generates 4 frequency signals according to the crystals used. Transistors admit...
