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).
This stage for JFETs was found in a 1965 US publication, but is valid for modern components. |...
The transistor of this circuit can be the BC558. The circuit is from an old documentation...
We found this circuit in an English publication from the 80's. The circuit is perfectly current,...