This nonlinear gain circuit was found in a 1965 Electronic Design. The configuration can be used as a basis for modern designs with equivalent transistors.
Varicap or varactor is the basic component used in this circuit of an American 80's documentation. The...
This simple power or speed control for DC Motors uses a Power MOSFET as driver stage and a 4093 IC as...
This 80's circuit uses a small light bulb as an indicator, but an LED with the appropriate resistor...