Amplifier stage (CB21940E)

This circuit with germanium transistors was found in a publication by Gernsback from 1960. The circuit is low power, a few tens of milliwatts.

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Darlington Push Pull Stage (CB6971E)
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Digitally Controlled Siren (CB11866E)
The oscillator shown in the figure emits sound when or another input is taken to a high level and...
1 kHz CMOS Oscillator (CB19232E)
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