100 kHz VCO (CB21489E)

This voltage-controlled oscillator was found in a 1965 Electronic Design. Transistors are from the time, and modern equivalents can be tested.

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Stepper Motor Control (CB13805E)
This configuration was found in a 1976 publication. The outputs of the logic circuits are applied to...
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The very high-input impedance of the CMOS gate allows this kind of device to be used as a...