Programmable attenuator (CB6793E)

This circuit was found in Harris' 90s documentation. The used component is uncommon today.

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Simple Timer 555 (CB19025E)
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Photoelectric comparator (CB7508E)
This circuit compares two light intensities, providing the indication on an analog instrument. The...
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This circuit was obtained in a 1983 publication. It is a 1-transistor voltmeter, capable of...