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  • Four-Channel Digital Voltmeter with Display and Keyboard
    current is 150 mA. PORTA is rated for a 50 mA source current and 80 mA sink current. This makes the PIC16C71 ideal for driving 7-segment LEDs. Since the total number of I/O pins is limited to 13, the 8-bit PORTB is used to drive the 4 LEDs, while external sink transistors, or MOSFETs, are used
  • Flat-panel displays
    consist of liquid crystal sandwiched between polarizing glass plates. Liquid-crystal molecules are elongated in shape and align themselves to external electric fields. Molecular orientation determines how the material reflects light. Display segments are made visible or translucent by electrically

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