Audio Frequency Meter

A scheme in the audio frequency of 555 meters with a monostable multivibrator (one-gun trigger). A monostable multivibrator can act as frequency-to-voltage converter because it produces a fixed pulse width, with the level of repetition / density is proportional to the trigger input frequency.

Resistor R3, set the scope of work measurement, better use Rotary switch to select different values for different ranges. If the obstacles R1 set 1M generate 50Hz, 500Hz generate 100K, 10K produce 5000Hz. For ampere meter, you can use both analog or digital ampere meters. A cheap dual-slope ADC digital meters.
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