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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Simple 1-transistor receiver (CIR22512E)
This circuit is from 1950, from the time when some still called the crystal triode transistor. The circuit is...
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In the circuit shown in the figure, when the input voltage rises to 27 V, the TL431 triggers the...
Full wave rectifier filter (CB7582E)
This circuit was found in a Popular Electronics from the 90s. The power source must be symmetrical...