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This document summarizes a circuit design for a bidirectional bar graph voltmeter using an LM3914 chip. The circuit uses MOSFET transistors to control the direction the LEDs light up, allowing the display to indicate either positive or negative input voltages. An adjustable resistor ensures symmetry by setting the voltage across one resistor to 1/11 of the reference voltage. The bargraph sensitivity is determined by the ratio of two resistors in the voltage divider.
- Author
- Tatiiieleee
- Language
- EN