Product Detector for SSB (CB26010E)

This circuit with the NE602 was found in the February 1997 Electronics Now magazine. The NE602 integrated circuit is not very common these days.

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High impedance window comparator (CB6091E)
General Electric suggests this circuit in a 1980s documentation. The operational of the time is...
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This circuit, from a 1973 publication, locks the relay when the light that falls on the LDR is cut...
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