Complementary AC switch (CB20717E)

With this circuit it is possible to simultaneously control two low voltage incandescent lamps. SCRs are from the 70s, admitting modern equivalents.

Motor Speed Control (CB12048E)
This control for motors with current up to 1.5 A was obtained in a 1989 publication, but it can...
Code practice oscillator (CB8697E)
This circuit was found in a 90s Wels' Think Tank. The frequency depends on C2 and R3. The handset...
Peak Indicator (CB5329E)
This circuit is from an old documentation but still current for assembly. Just use BC548 instead...