Heart Monitor –Transmitter (CB25406E)

This circuit was found in a Radio Electronics magazine from November 1991. The circuit operates at 2.2 MHz and has a low impedance output.

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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...