555 additional circuit for measuring voltage with a frequency meter
As shown in the figure, this circuit consists of an unsteady multivibrator composed of 555 and R1, RP1, and C1, and a decay resistor. As a voltage-to-frequency converter, it can measure a DC voltage of 0 to 5V.
Potentiometer RP1 determines that when the input voltage is 0V, the reading of the frequency meter is 0Hz; RP2 is used to adjust the reading of the frequency meter to 50Hz when the input voltage is 5V, that is, the full-scale adjustment. This additional circuit allows the measurement frequency to be replaced by the measured frequency.
The frequency meter, also known as the frequency counter, is an electronic measuring instrument that specifically measures the frequency of the signal under test. The frequency meter is mainly composed of four parts: a time base (T) circuit, an input circuit, a counting display circuit, and a control circuit.
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