We found in this American documentation this circuit for activating common cathode displays. In it we have the way to cascade the 4033 to drive two displays (dozens and units).
Found in a 1970 EEE, this circuit uses general-purpose transistors of the time. Transistors support...
In the figure we have a simple signal tracer circuit to be coupled to the volume control of an AM...
This is a small audio amplifier for headphones for experimental receivers. The transistor can be...