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scoreboard for cricket

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crutschow

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Most Helpful Member
The collector of a bipolar transistor can act as a constant current source. With a resistor in the emitter circuit, the current will be proportional to the voltage across the base junction - emitter resistor.

The size of the display is not significant, it's how much current each display segment requires.
 

SamX

New Member
dear carl the idea of collector as a constant current source is not driving the segment properly it requires atleast 30 milli amp cirrent with voltage variation of 7.5 to8 volts ....
 

SamX

New Member
more over when i connect all the segments of this active low 7 segment the is a tremendous voltage drop in the output of the segment resulting in the increase of voltage across resistor and heating them..........
 

crutschow

Well-Known Member
Most Helpful Member
Need a schematic to understand what you are doing. Sounds like something is incorrectly connected.

Why would you connect all the segments to the 7 segment?
 
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