Comparator with AND gate (CB9407E)

This tunnel diode circuit was found in American documentation from 1966. The tunnel diode is the critical component of this circuit.

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Class A power amplifier (CB22236E)
This circuit is from an American publication from the 60's. The power is on the order of 600 mW....
LED Driver MC34071 (CB15285E)
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Device On indicator (CB7014E)
Found in a European magazine from the 90s, this circuit emits beeps that are several seconds apart to...