Electromechanical Counter (CB21682E)

This photoelectric circuit from a 1960 publication uses a 6.3 V electromechanical counter, common at the time.

Audio Selector (CB213E)
S1 changes the selection of the input signals in the circuit shown here. Other type of circuits,...
Musical Organ (CB20744E)
Found in documentation two years 80, this toy instrument uses an integrated circuit little...
Transistor Power Operational (CB19383E)
With this configuration, greater power can be obtained from an operational amplifier, thanks to...