30 MHz Amplifier (CB5939E)

This low noise circuit was obtained from a 1980s US RF publication. Transistors used are uncommon today and the gain is 19 dB..

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Continuity Tester (CB4351E)
This circuit was obtained from an English magazine from 1977. The magazine no longer exists, but...
4-band microammeter (CB8210E)
Found in a 90s Radio Electronics this circuit requires precision resistors in the dividing...
Impedance Adapter (CB14897E)
This circuit consists of a pre-amplifier for high impedance microphones. The circuit uses a FET...