cheap frequency counter

This frequency counter uses your existing digital multimeter as the display unit that is why it can be constructed at very low cost. Due to the high impedance of most DMMs, a frequency to voltage converter can be easily connected to it without matching problems. The converter shown in the diagram has a frequency range of 10 Hz up to 1 kHz (positio
cheap frequency counter - schematic

n A) and 1 kHz up to 100 kHz (position B). The sensitivity at low frequencies 10 Hz up to 1 kHz is around 35 mVpp and increases to 350 mVpp at a frequency of 100 kHz. The DVM you are going to use must be connected to the plus and minus terminals of the converter`s output. The conversion in A range is 1 kHz= 1V and in B range is 100 kHz= 1V.

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