Photo FET trigger (CB8329E)

The photo FET is not a common component today. In this 1964 Electronic Design application we have a light switch circuit.

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Battery Charger (CB4388E)
This circuit, obtained from a 1965 magazine, can still be assembled using some modern equivalent...
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The LEDs act as diodes, so if good they will show the same characteristic curve. Arrangment shown...
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We found this circuit in an ancient American documentation. It can be adapted to operate in other...