Microphone preamp (CB22043E)

This preamp was found in an old English publication. Any usage JFET can be employed. The output is high impedance.

Crossing Signal For Railroad Modeling 3 (CB3856E)
This circuit uses two sensors that are placed at the intersection of a miniature railroad, causing the LED...
Crystal unijunction oscillator (CB20679E)
This circuit was obtained in an Electronics World of 1969. It is a crystal oscillator with a 100...
10 MHz Tuned Resonator Oscillator (CB6142E)
This circuit was found in a 1980s documentation for amateur radio. The circuit makes use of...