audio frequency meter

Posted on Feb 7, 2014

This is a circui for audio frequency meter. This circuit uses 555 IC as a mono stable multi vibrator (one-shoot trigger). A mono stable multi vibrator can act as a frequency-to-voltage converter because it produces a fixed pulse width, with the repetition rate/density is proportional to the triggering input frequency. This is the figure of the cir

audio frequency meter
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cuit. For resistor R1, because it set the measurement range, it`s better to use a rotary switch to select different values for different ranges. For the ampere meter, you can use analog or digital ampere meter. A cheap dual-slope ADC digital meter is suitable because its averaging characteristic, but a fast digital multimeter can also be used although it may show some uncertainty because of their fast sampling.

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