Solid State Relay (CB21717E)

Equivalent optocouplers can be used in this relay or solid-state shield. The power of the load depends on the triac used.

Fuel Low Warning (CB24111E)
This circuit was found in the April 1971 Radio Electronics magazine. It uses common transistors and can...
Telephone Scrambler (CB23524E)
This voice scrambler and descrambler circuit was found in a Radio Electronics from July 1963....
Ladder Generator (CB21245E)
Using a 4017 as a base, this circuit from a 1990s Popular Electronics generates low-frequency...