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4511B_COMMON_ANODE_DISPLAY_DRIVER

2016-12-01 15:39  
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4511B_COMMON_ANODE_DISPLAY_DRIVER
The use of a switching transistor (like a 2N2222 or 2N3904) allows use of the CD4511B with a common-anode display. Ry should be chosen to provide about 1 mA to drive Q1 and Rx should provide enough current to drive the display. For this circuit, the transistor gain (HFE) should be at least the ratio of the segment drive current to the current through Rx