Three-input majority gate (CB7248E)

This interesting logic circuit was found in a manual of neon lamp applications.

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Small guitar amplifier (CB22150E)
We found this circuit for guitar training in an English documentation from 1989. The components are from...
Two-step relay lock (CB8835E)
This circuit produces a voltage drop in the first pulse, turning off the relay. On the second...
Tonal Corrector (CB16292E)
Readers who like sound or sound effects cannot fail to examine this interesting circuit. What we...