Crystal oscillator (CB9504E)

This circuit was found in a 90s Popular Electronics. It can generate signals from 3 to 10 MHz.

Voltage reference with REF01 (CB24681E)
This is a circuit with a period component that consisted of a voltage reference. The circuit is...
Tunnel Diode Regenerative Receiver (CB13339E)
This experimental circuit was found in a technical publication from 1976. The diode can be of...
Tone control (CB15478E)
Tone controls for audio applications can also be considered filters that must attenuate certain...