One-transistor oscillator (CB22064E)

Capacitors C2, C3 and C4 determine the frequency of this simple oscillator. Transistor can be general purpose equivalent.

10 A NO Relay (CB6013E)
This isolated solid state relay can function as a shield directly controlling 10 A loads. The...
Crystal Colpitts Oscillator (CB20665E)
This oscillator was found in Radio Electronics from the 90s. C1 and C2 have 2,700 pF and the...
Constant current source (CB20484E)
This circuit uses a current regulator from the 90's. This component is uncommon nowadays. The...