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Old 10th November 2013, 12:19 PM   #1
akis is offline akis  United Kingdom
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Join Date: Jul 2008
Default Another capacitor ESR meter

Hello

I cannot remember where exactly I stole the ideas from, but I made this at home and it works very well. Until another one I bought from ebay arrived a few days later :-)

It only requires a few components, but it needs a 100K-500KHz sine source with internal resistance of 50R (depicted as Rs) and it needs a DC mV meter at the end to show the ESR, where 1mV is equivalent to 1mOhm. The figure displayed also contains the capacitor's impedance at that frequency, but for typical electrolytics at 500KHz it is quite small as to be ignored.

The output of the voltage source (4Vp), the internal and external resistors and the Av of the first stage have been chosen so as to be able to read in mV the equivalent ESR with 1:1 ratio.

I have tried it with two op-amps, the LT1361 and the LM6172, the latter has much higher input currents but is half the price of the LT1361.

Thanks
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