Logical optical driver (CB7300E)

We found this circuit in a Motorola documentation from 1968. Phototransistors are common and bipolar general purpose.

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Power Control (CB19813E)
This power control for powers up to about 10 W uses wire potentiometers in an arrangement that...
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This simple transistor test circuit was found in Radio Elecronics magazine from October 1961. It...
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Another triggered oscillator that we found in the November 1984 Radio Electronics magazine. The...