10 Hz to 10 kHz VCO (CB8746E)

This 3-decade operating range VCO was found in a 90s Popular Electronics. The circuit uses components that admit of equivalents.

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Pulse generator shield 555 (CB8196E)
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Found in an Electronic Design of 1965, this circuit consists of NOR gates and can be used in...
5V x 500 mA Buck Converter (CB9952E)
Found in documentation from the 1970s, this reducing regulator uses integrated circuits and...