# Current meter - eurorack

**URL:** <https://lookmumnocomputer.discourse.group/t/current-meter-eurorack/4943>\
**Category:** DIY STUFF\
**Created:** [April 26, 2022, 1:27pm UTC](https://lookmumnocomputer.discourse.group/t/current-meter-eurorack/4943 "2022-04-26T13:27:46Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![AlphaCrucis](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/alphacrucis/32/19405_2.png) [@AlphaCrucis](https://lookmumnocomputer.discourse.group/u/AlphaCrucis)\
**Post date:** [April 26, 2022, 1:27pm UTC](https://lookmumnocomputer.discourse.group/t/current-meter-eurorack/4943/1 "2022-04-26T13:27:46Z")

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Hi folks,

Naive question: would it be possible to adapt one of these cheap aliexpress current/voltage meters ([0.56'' Dc 100v 10a Voltmeter Ammeter Blue + Red Led Amp Dual Digital Volt Meter Gauge Car Motocycle Voltage Current Meter - Voltage Meters - AliExpress](https://www.aliexpress.com/item/1005003775628909.html)) to check how much current an eurorack setup is drawing? Are there any DIY alternatives?

Cheers!

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**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\
**Post date:** [April 26, 2022, 2:12pm UTC](https://lookmumnocomputer.discourse.group/t/current-meter-eurorack/4943/2 "2022-04-26T14:12:18Z")

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There’s some discussion of something similar, but from 11 years ago, here:

[https://modwiggler.com/forum/viewtopic.php?t=46075](https://modwiggler.com/forum/viewtopic.php?t=46075)

I can’t see anything in your AliExpress listing about voltage drop. If it’s as low as the one mentioned in the above link it’s presumably not a big problem, if it’s much larger it might be.

In that discussion one person says

> I think I’m right in saying we definitely don’t want a ‘lowside’ connection in a synth environment though - the extra handful of millivolts above ground could cause trouble…?

and I don’t know if that’s a legitimate concern or not, but it does appear the AliExpress module is made for a lowside connection.

On a quick search the only synth ammeter product I found was the ADDAC ADDAC200A

> **[ADDAC200A - - Products - ADDAC System | Instruments for Sonic Expression](https://www.addacsystem.com/en/products/modules/addac200-series/addac200a)**
>
> All things Eurorack Modular manufacturer based in Lisbon, Portugal

which I guess isn’t DIY and for which they seem to provide NO documentation whatsoever! [Here](https://modwiggler.com/forum/viewtopic.php?t=184029) it says (in 2017) “More information coming soon!” — and then no more information.

I don’t think current draw for a module is likely to vary a lot, so maybe just measuring each module once and then keeping track of the total plugged into each PSU is adequate.

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<div class="post-metadata">

**Author:** ![AlphaCrucis](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/alphacrucis/32/19405_2.png) [@AlphaCrucis](https://lookmumnocomputer.discourse.group/u/AlphaCrucis)\
**Post date:** [April 26, 2022, 2:18pm UTC](https://lookmumnocomputer.discourse.group/t/current-meter-eurorack/4943/3 "2022-04-26T14:18:38Z")

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There’s this one too: [Test 3 – Joranalogue Audio Design](https://joranalogue.com/products/test-3)

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**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\
**Post date:** [April 26, 2022, 2:32pm UTC](https://lookmumnocomputer.discourse.group/t/current-meter-eurorack/4943/4 "2022-04-26T14:32:04Z")

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Good find. The schematic and firmware are available with CC BY-SA and GPL licensing. Not the PCB design, unfortunately.

> **[GitHub - joranvg/test-3: Test 3 Eurorack V/mA Meter](https://github.com/joranvg/test-3)**
>
> Test 3 Eurorack V/mA Meter. Contribute to joranvg/test-3 development by creating an account on GitHub.

Anyway, it’s in stock at SynthCube.

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<div class="post-metadata">

**Author:** ![ChristianBloch](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/christianbloch/32/56_2.png) [@ChristianBloch](https://lookmumnocomputer.discourse.group/u/ChristianBloch)\
**Post date:** [April 27, 2022, 12:43pm UTC](https://lookmumnocomputer.discourse.group/t/current-meter-eurorack/4943/5 "2022-04-27T12:43:41Z")

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Note than the Test 3 is limited to 1A max on each rail.