Reverse pulse counter circuit based on ZN425E

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM
Photocoupler

If a digital-to-analog converter is used in the feedback loop of an op amp, the amplification gain is inversely proportional to the input digital or input code of the digital-to-analog converter, and the reversal causes the scaling and the positive voltage to be inversely proportional.

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