4511B Common-Anode Display Driver Circuit

  
The use of a switching transistor (like a 2N2222 or 2N3904) allows use of the CD4511B with a common-anode display. should be chosen to provide about 1 mA to drive Ql and Rr should provide enough current to drive the display.
4511B Common-Anode Display Driver Circuit - schematic

For this circuit, the transistor gain (Hfe) should be at least the ratio of the segment drive current to the current through R.




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