Microfarad Counter

  
This circuit measures capacitance by the time it takes an unknown capacitor to reach 6.32 V (10 V 63% or 1RC time const
Microfarad Counter - schematic

ant) when charged through resistor R. The LED used as a timebase is pulsed by Q3, Q4, and Q5. By counting seconds (two flashes per second) until threshold detector Q1/Q2 stops the count, you can directly read the number of microfarads. RXf R2, Rz, Ri, and R5 can be any convenient values, such as 1 KOhm, 10 KOhmhm, 100 KOhmhm, 1Mohm, 10Mohm.




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