Diode Tester (CB22137E)

This diode tester was found in an English publication from the 1980s. Transistors are general-purpose types of the time.

AC Motor Speed Control (CB16747E)
This 1992 circuit has a diode normally replacing the diac that is used in this type of...
Tuned Coil Hartley Oscillator (CB25940E)
This oscillator was found in the January 1996 issue of Electronics Now magazine. The frequency is given by...
Symmetric Power Source Up To 3 A Divider L165 (CB15142E)
This circuit divides the voltage of a source by 2, allowing its use as a symmetrical source. In...