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Economical led bar display

Economical led bar display
A particular difficulty with LED har displays is the high current drain. LED driver LM3914 controls a chain of LEDS instead of as usual a number of parallel connected LEDs. This means that in principle only a single diode current is needed to make several LEDS light. The cost of this is. of course. a higher supply voltage, since account must be taken of a numher of diode forward voltages.
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