New simple small capacitance detector circuit based on 5G7556
As shown, this circuit can be used to measure small capacitors from 50pF to 50nF. The left half of the 5G7556 constitutes a multivibrator with a fixed pulse width t1 and a period T, and the right half constitutes a one-shot circuit, and the size of the capacitor Cs to be measured is indicated by the meter M. The scale of the Cx capacity of the meter head can be adjusted with R3. In order to improve accuracy, a standard capacitor calibration scale is required.
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