Power Grid Monitor (CB21154E)

We found this circuit in a Popular Electronics from the 90s. Its purpose is to monitor a power line. The circuit uses optical couplers of the time.

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Thermometer for 5V operation with (CB8711E)
Found in a 90s 303 Circuits, this circuit uses the KTY10 sensor, widely used at the time. | Clique na...
Fluorescent SCR Inverter (CB12328E)
This circuit is from a 1967 publication. It is possible to power a fluorescent lamp from a 12 V...
Complementary Amplifier (CB24329E)
This unusual output stage was found in the October 1974 issue of Radio Electronics magazine. The...