Electronics > Projects, Designs, and Technical Stuff
Digital ESR meter design
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stefan_trekkie:

--- Quote from: Shock on January 30, 2020, 08:51:56 am ---If your circuit has calibration or can zero out the lead resistance

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Yes, it has two calibrations. For zeroing and second for fine tuning by using known accurate calibrating resistance of few ohms

 
--- Quote from: Shock on January 30, 2020, 08:51:56 am ---should be looking at an LCR meter.
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I have dedicated Capacitance meter up to 20000 µF


--- Quote from: Jay_Diddy_B on January 30, 2020, 11:56:45 am ---
You may want to consider my other design:

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Nope I did not know of it. But i know now  :-+ It looks very linear and again simple enough .

***
That is the deal, folks .. The circuit is not good from 9 volt battery. When turned on it displays the usual (-1***) but after half of second the digits start go all over the place. After scoping found that the voltage is dropping to around 7 on the battery itself and 3.9 volts for the 5 volt digital stuffs. I have shunted the safety diode for additional 0.7 volts but it is not enough.
The drive signal is good, op amps are working nice.

jaxbird:
I did a digital version of Jay_Diddy_B's 5 Transistor ESR Meter some years ago and I still use it today to check for bad caps in circuit.

However it appears all the details (images) are gone: https://www.eevblog.com/forum/projects/esr-meter-build/
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