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.

Two-tone generator (CB8446E)
This circuit was found in a 90s Popular Electronics. It generates tones given by the oscillators and...
500V Current Monitor (CB5380E)
This current monitor can operate on 500V circuits. The circuit is suggested by a 2005 Linear...
Multi-Feedback Band Pass Filter (CB4025E)
This circuit is from the Motorola Linear Databook published in 1990. The circuit for 1 kHz can be...