The LED car voltmeter (3)

The LED car voltmeter consists of the filter circuit, voltage distribution filter circuit, voltage amplifier circuit and LED display circuit, see as figure 7-77. The regulator filter circuit consists of the 3-terminal IC1 and filter capacitor C1. The voltage distribution filter circuit consists of the resistors
The LED car voltmeter (3) - schematic

R1-R7 and capacitor C2. The voltage amplifier circuit consists of the 6 NOR gate circuitS IC2 (D1-D6). The LED display circuit consists of the LED vl1-vl6 and resistors R8-R13.

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