Crystal oscillator (CB9504E)

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

Brightness control for LEDs (CB9711E)
This automatic brightness control that uses an LDR as a sensor, was found in American...
Simple field strength meter (CB23668E)
The coils used depend on the frequency range that can be used with this device. We found it in a...
Overtone Oscillator (CB24030E)
This oscillator for the fifth overtone of a crystal was found in a Radio Electronics magazine from...