.. and discharged, but to measure high value capacitors, R8 cannot be decreased too much. The best way is to decrease the frequency for example, using a 4060 , and selecting the appropriate output. Then, the fine adjustment may be done ...
.. Design Idea presents a very accurate, yet very inexpensive, capacitance meter. It was specifically designed for measurements of low value capacitance with an accuracy of better than 1 pF ...