5_pF_TO_1μF

Published:2009/7/5 22:47:00 Author:May | From:SeekIC

Consists of an oscillator using two gates from CD4011 quad NAND gate, separated from diode rectifier by another NAND gate. Increasing oscillator frequency gives more pulses per second and higher integrated meter reading. Each meter range is linear, so value of 5-pF capacitor can be read on lowest range.Diodes are 1N34 or equivalent. R1 is 12K, and R2-R6 are 50K trimpots set to values shown in table. R7 is 5K, and R8 is 10K trimpot. B1 is 9-V transistor battery. Article covers construction and calibration with known capacitors.-E. Landefeld, Build a Simple Capacitance Meter, 73Magazine, Jan. 1978, p 164-165.



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