One-transistor oscillator (CB22064E)

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

Astable Duty Cycle (CB25655E)
This variable duty cycle circuit was found in the December 1993 issue of Electronics Now magazine. The...
AC Power Switch with Optocoupler (CB12416E)
This solid-state relay circuit (SSR) or shield is from a 1995 Electronics Now. With it we can...
Low Impedance Preamp 2 (CB21895E)
This configuration was found in Raytheon's circuit manual from the 1960s. The circuit has an...