27 MHz Oscillator (CB24983E)

This tunnel diode oscillator was found in July 1986, Radio Electronics magazine. Note the low supply voltage.

Earphone Amplifier (CB416)
This is a amplifier for XTAL high impedance earphones or piezoelectric types. Current drain is...
Precision amplifier (CB9016E)
This circuit was found in a 70s American documentation. The operational amplifier supports a modern...
Generator for the MW band (CB25718E)
This circuit can be used both as a beat oscillator and for testing and adjusting AM receivers for...