Receiver for the 40m band LM602 (CB25305E)

This circuit uses an FM IF transformer for tuning. The circuit is from a Radio Electronics magazine from April 1990.

Temperature sensor shield (CB5093E)
This circuit was found in an old publication and can be adapted for use with modern...
Voice Suppressor (CB4751E)
This interesting circuit found in a European publication from the 1990s eliminates the voice that...
Simple Electronic Thermometer (CB525E)
This circuit can also be used as a simple thermoscope (temperature changes indicator) in the...