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Cheap Dot-mode Bargraph Display

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The five-stage linear dot-mode bargraph display shown in here has a number of distinct advantages, which may be summarized as:
1. the resistor chain is fully customizable;
2. IC1's high input impedance results in minimal loading on circuits;
3. IC1 and IC2 have a wide supply voltage range, between 3V and 15V
4. If a higher supply voltage is used, all colour LEDs may be employed with a single ballast resistor R3.
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