Piezoelectric Buffer (CB21152E)

This circuit was found in American documentation from the 90s. It serves as an amplifier for a piezoelectric transducer.

Vswr protection circuit (CB20375E)
This protection circuit for standing waves was found in a manual of high frequency circuits and...
Code Switch (CB6536E)
We found this circuit in a Popular Electronics of the 80s. Used integrated circuits are uncommon...
Nixie tube circuit (CB23938E)
This experimental circuit with Nixie tube was found in the Radio Electronics magazine of March...