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Oscillator coil with common wires?
Oscillator coil with common wires?
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Old 10th July 2019, 04:11 PM   #11
Elvee is offline Elvee  Belgium
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This project has most of the building blocks required for an ESR meter; just a few cosmetic arrangements are required:
My take on the winding's phase-finder (AKA "Phasedots tester&quot

Click the image to open in full size.

The stimulus generation section U1 U2 is basically OK, the frequency could be increased, and the test current adjusted, but that's no big deal.

The preamplifier U3 can also be used, but without the clipping diodes.

The phase detector U4 is not required, and can simply be ignored, or converted into another amplifier.

Finally, a diode detector would drive the meter

As the circuit has already been tested in its previous form, the new version could be made to work with a minimum work of debugging
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Old 10th July 2019, 07:22 PM   #12
Elvee is offline Elvee  Belgium
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Phantom, if you indicate your preferences, I will provide an adapted schematic for the phase tester, and I will even breadboard it, to check that it performs as intended.

It will not be more complicated than your initial choice (1 cheap, common IC required), and it will operate in a much more deterministic manner: it will even provide semi-calibrated results if you want.

What I mainly need to know, is your preferred indicating device: a 50µA galvanometer, a multimeter, or else?

I think that such a project might help other members, and is worth pursuing.

If you find another alternative, you can submit it: we will check its sanity.
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Old 10th July 2019, 10:05 PM   #13
PhantomBox is offline PhantomBox  Venezuela
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Thank you very much, I will most certainly accept your offer. What I need is not so much a phase tester but ESR meter. And I don't have a clue if both meters are basically the same...
Here is what I have on hand:
A digital multi-meter with 2000µ / 20m / 200m / 10 DC Ampere on its scale.
Some analog meters but these have a range up to 100 DC Ampere, that's probably way to much for a few µA squeezed on a 1.5 inch scale...
A regulable DC power supply, based on the LM317 adjustable regulator.
Thanks again for taking on the herculean task of developing a schematic.

Phantombox
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Old 10th July 2019, 11:03 PM   #14
mirlo is offline mirlo  United States
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You might take a look at Alan Wolke (W2AEW)'s design: google "W2AEW ESR meter".
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Old 11th July 2019, 04:11 AM   #15
PRR is offline PRR  United States
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Quote:
Originally Posted by rayma View Post
The 741 is rated for 20V minimum, not 5V. ...
An incomplete specification. Perhaps to promote sales of later "low voltage" chips.

The turning-point is 7V. Above that all the guts get proper current. There is considerable internal drop in a '741 but you still get some output swing.

Below 7V the guts starve for current, gain and GBW fall off quick, and the fairly constant voltage losses leave very little output swing.

Still for a utility audio oscillator, it may do fine even at 5V. If it does not do all the spec-sheet says, you have no complaint because you did violate the "minimum".

Thousands of guitar pedals showed that it did in fact "work", at some useful level, with 9V batts fading to 6V.

Agree that page's "ideas" are maybe not the best, maybe not good.
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Old 11th July 2019, 12:40 PM   #16
PhantomBox is offline PhantomBox  Venezuela
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While looking at the Alan Wolke design, I found a link to another project esr meter – awsh.org. What do you think of that?
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Old 11th July 2019, 02:32 PM   #17
Elvee is offline Elvee  Belgium
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It is a much better option, and at least it will actually work.
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Old 11th July 2019, 02:42 PM   #18
PhantomBox is offline PhantomBox  Venezuela
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Thanks again for your expertise.
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Old 11th July 2019, 02:58 PM   #19
Elvee is offline Elvee  Belgium
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It can be simplified somewhat without problem, for example:
Attached Images
File Type: png EditedESR.PNG (49.4 KB, 34 views)
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Old 11th July 2019, 03:19 PM   #20
PhantomBox is offline PhantomBox  Venezuela
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I can observe that you left out some components (R13/14/16/20/21/22, C4/6) from the original design, that would be the "blanc" spaces?
Also there some new parts and modified values.
Would your modified circuit work as is is?
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