关键词: low powered op amps, quad op amps, rail-to-rail inputs, rail-to-rail outputs, rail-to-rail op amps, opamp
Abstract: In its simplest form, the PC voltmeter consists of a 4-channel, 10-bit A/D converter (IC2) with a few passive components, connected to the PC printer port via a 25-pin male D-type connector.
Circuit Enables PC-Based Voltage Measurements.pdf 
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STM32
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