Signal Detector (CB6663E)

This 1970 circuit triggers a load when it receives a signal. Components are common and SCR admits equivalent to load.

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Symmetrical Regulator LM380 (CB5879E)
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The circuit shown in the figure uses a TRIAC and an SBS for triggering, with a diode bridge and an...
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Very strong audio spikes in a headset can damage the ear. This circuit, from a 90s Popular...