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How to measure ESR?
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OM222O:

--- Quote from: Shock on May 04, 2019, 07:31:51 pm ---If you are interested in a simple design forum member Jay_Diddy_B has one here with a written overview. It's 100kHz and has input voltage protection and a low build cost. Requires a multimeter to read the measurement. https://www.eevblog.com/forum/projects/esr-meter-adapter-design-and-construction/

If you are interested in a kitset or off the shelf. Chinese ones start from $20 upwards. I'd recommend though a Bob Parker ESR meter design. Altronics, EVB and Anatek sell them for around $100, these can be cheaply modified to have better input voltage protection.

The DER EE DE-5000 (LCR meter) also measures ESR and has multi frequency support, you're looking at also around $100. Not the simplest for in circuit testing and no decent input protection, a good value instrument however, hard to beat features and accuracy for $100.

--- End quote ---

he also designed the 5 transistor ESR meter which somebody else posted  :-DD he must love designing ESR meters  :-+
I would still like to try to create one from scratch using the bridge method which I mentioned earlier, as It's a great opportunity to learn something that I'm not very familiar with!
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