Dual temperature monitor (CB21377E)

This circuit was obtained from a 1967 GE SCR manual. It is intended for controlling relays responding to a decrease or increase in temperature.

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Old RIAA Equalizer (CB1375E)
This circuit is from a Japanese magazine of 1973. The circuit is designed to withdraw the power...
Special Sound Generator (CB4454E)
This is an interesting sound effects circuit that uses only discrete components. Components are common...
Burned Lamp Detector (CB15721E)
This circuit causes a green LED to light up when we step on the brakes and the rear lamps to light...