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  • Four-Channel Digital Voltmeter with Display and Keyboard
    to sink the digit current (Figure 1). Another alternative is to use ULN2003 open-collector sink current drivers, which are available in 16-pin DIP or very small 16-pin SOIC packages. Each transistor on the ULN2003 can sink a maximum of 500 mA and the base drive can be directly driven from the PORTA pins.

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