Transistor gain meter (CB20522E)

This circuit was found in a publication in the 1950s, mainly applying to germanium transistors of the time.

Solid state relay (CB9164E)
This shield was found on an old EDN. The MOSFET can be of any type according to the controlled...
Fluorescent Lamp Inverter (CB18777E)
This inverter circuit, which consists of a Hartley power oscillator, was found in a 1993...
Power Oscillator 741 (CB15616E)
This circuit is basically the same as the previous configuration (CB15616E) with a power stage with...