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Variable range 1.2~1000V line mode sound and light voltmeter circuit
Source: InternetPublisher:宋元浩 Updated: 2017/02/22
As shown in the figure, the circuit is composed of LED display drive circuit, voice circuit, audio power amplifier circuit, etc. It can linearly display a voltage of 1.2 to 1000V with 10 LEDs. When it is close to the upper limit voltage, the circuit will send out a voice call-holding signal.
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