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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Two-Transistor Darlington Amplifier (MSB035)
This two-transistor amplifier can be used as power stage for intercom, experimental receivers,...
Electroscope (CB22132E)
This sensitive circuit was found in old English documentation. Transistors may be modern...
Logarithmic Converter (CB19486E)
This configuration, already presented in other points of this section and website, is of a...