Super heterodyne input stage (CB8393E)

Found in a 90s Popular Electronics, this circuit uses components from that time, for a superheterodyne receiver design.

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Audio Frequency Meter (CB20477E)
Found in a Popular Electronics from 1992, this circuit uses a PLL567 in an audio meter bridge that...
Comparator for opposite polarity voltages (CB5083E)
We found this circuit in an American 1980s documentation, but it can be implemented with modern...
Beat Frequency Oscillator (CB25319E)
This BFO or OFB for listening to SSB (Single Sideband) signals was found in the January 1996 issue...