The frequency process of 555 oscillator is popularly known. For a known resistors and capacitor, the frequency can be determined by a formula. From the maths logic, if the oftenness and the resistors are known, then an unknown capacitor could be determined by the reverse of the formula. Someone who has a frequency counter are [...]
Source: http://circuitdiagramwiring.com/capacitance-meter-using-555-oscillator/
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