10 MHz counter (CB20128E)

This meter has a 0.001% tolerance and was found in an old American publication. The circuit has a selectable output.

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Positive Peak Detector (CB15310E)
Other operational amplifiers of the same series can be used on this circuit found in Motorola's Linear...
1 second flash (CB22199E)
Found in 1980s documentation, this circuit produces 1 Hz flashes. The op amp supports equivalent. R5...
Dual Tuning Circuit with Varicap (CB13344E)
In the figure we have the way to use a single control voltage to act on two varicaps...