Positive ground tachometer (CB9352E)

This circuit was found in RCA documentation from the 1960s. The circuit uses components from that time and can measure speeds up to 10,000 rpm.

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SCR surge protector (CB8711E)
Found in a 90s nHands On Electronics, this circuit triggers a relay that shuts off the load when...
DC Motor Control 555 (CB24908E)
Another of the many similar configurations we have in this section. This one is from a Radio...
Sound Activated Dimmer (CB24602E)
This circuit for incandescent lamps was found in the January 1980 Radio Elecronics magazine. The...