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.

15 Channel Remote Control (CB13997E)
This decoder TTL circuit for 15-channel remote control was found in Selezione Radio, Italian...
Simple voltmeter (CB23544E)
This is the circuit of a sensitive voltmeter using a difficult-to-obtain 5 uA full-scale...
Photoelectric comparator (CB7508E)
This circuit compares two light intensities, providing the indication on an analog instrument. The...