One-transistor oscillator (CB22064E)

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

Phase Shift Oscillator (CB12065E)
In the figure we have the traditional configuration of a phase shift oscillator that produces a...
Buzzer (CB17504E)
This circuit produces an intermittent sound in a ceramic piezoelectric transducer, for example, a simple...
Adapter for Multimeter (CB1360E )
If you have a common analog multimeter, you can increase its input resistance in the measurement of...