# midiphy Eurorack Expander Modules **URL:** \ **Category:** MIDIbox SEQ\ **Tags:** line-driver, modular, cvgate, eurorack\ **Created:** [September 12, 2019, 6:10pm UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605 "2019-09-12T18:10:17Z")\ **Posts on this page:** 16\ **Page:** 7
**Author:** ![latigid\_on](https://forum.midibox.org/user_avatar/forum.midibox.org/latigid_on/32/107_2.png) [@latigid\_on](https://forum.midibox.org/u/latigid_on)\ **Post date:** [April 16, 2021, 9:25am UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/121 "2021-04-16T09:25:02Z")
That pad (pad 3) is not connected, so you can ignore it! ---
**Author:** ![laual](https://forum.midibox.org/letter_avatar_proxy/v4/letter/l/9fc348/32.png) [@laual](https://forum.midibox.org/u/laual)\ **Post date:** [April 16, 2021, 9:30am UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/122 "2021-04-16T09:30:22Z")
Ah great! 🙂 ---
**Author:** ![laual](https://forum.midibox.org/letter_avatar_proxy/v4/letter/l/9fc348/32.png) [@laual](https://forum.midibox.org/u/laual)\ **Post date:** [April 16, 2021, 12:05pm UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/123 "2021-04-16T12:05:55Z")
Me again, I’ve managed to solder the VREF1 on transmute 8. The CV module is working well for a couple of minutes and suddenly begins to jitter. When it does, all the eurorack modules become unstable and send random (I guess) very fast signals. Any help appreciated. ---
**Author:** ![latigid\_on](https://forum.midibox.org/user_avatar/forum.midibox.org/latigid_on/32/107_2.png) [@latigid\_on](https://forum.midibox.org/u/latigid_on)\ **Post date:** [April 16, 2021, 12:47pm UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/124 "2021-04-16T12:47:12Z")
It is important with older euroceiver boards that the J0 jumper is installed. This grounds the two systems. Is yours grounded?  To rule out the line drivers, you can bypass them but you’d have to open the SEQ case of course… Something else to try would be a different power supply e.g. the USB+5V instead of the regulator etc. Best, Andy ---
**Author:** ![laual](https://forum.midibox.org/letter_avatar_proxy/v4/letter/l/9fc348/32.png) [@laual](https://forum.midibox.org/u/laual)\ **Post date:** [April 19, 2021, 11:10am UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/125 "2021-04-19T11:10:28Z")
Hi Andy, I opened up my seq but couldn’t find a J0 to jumper on the TX module or on the Euroceiver module. Can you tell me where it is located? I’ll try to use a different source of 5V and see what that gives me. Thanks! Best regards, Laurent ---
**Author:** ![latigid\_on](https://forum.midibox.org/user_avatar/forum.midibox.org/latigid_on/32/107_2.png) [@latigid\_on](https://forum.midibox.org/u/latigid_on)\ **Post date:** [April 19, 2021, 11:29am UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/126 "2021-04-19T11:29:54Z")
Hi Laurent, For euroceiver versions 1.5 or older there is a J0 jumper above J19, near the USB. There is a jumper on the line transmit board but it basically supplies power over the DB cable, which you don’t really want as there is a big voltage drop. If grounding is not the issue then I would typically expect power supply (e.g. noisy USB), bad cabling or similar. At least you can test directly without the line drivers now the SEQ is open. Best, Andy ---
**Author:** ![laual](https://forum.midibox.org/letter_avatar_proxy/v4/letter/l/9fc348/32.png) [@laual](https://forum.midibox.org/u/laual)\ **Post date:** [April 20, 2021, 7:04am UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/127 "2021-04-20T07:04:10Z")
Hi Andy, Can I power the euroceiver module with the USB-B plug on the module? Sorry, not entirely sure what the plug is for. Thanks, ---
**Author:** ![latigid\_on](https://forum.midibox.org/user_avatar/forum.midibox.org/latigid_on/32/107_2.png) [@latigid\_on](https://forum.midibox.org/u/latigid_on)\ **Post date:** [April 20, 2021, 8:02am UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/128 "2021-04-20T08:02:38Z")
Yes! Just switch the jumper appropriately. ---
**Author:** ![laual](https://forum.midibox.org/letter_avatar_proxy/v4/letter/l/9fc348/32.png) [@laual](https://forum.midibox.org/u/laual)\ **Post date:** [April 22, 2021, 2:26pm UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/129 "2021-04-22T14:26:42Z")
Hi, After some more debugging, I could not find the problem… But, some blue smoke later, it turns out my tantalum caps were reversed on the SUPERDAC (anode is marked on the caps, not the cathode…). It should be more stable now. Sorry for the disturbance… Thanks for the help, Andy! I’ll try and make some music now 🙂 Take care, ---
**Author:** ![latigid\_on](https://forum.midibox.org/user_avatar/forum.midibox.org/latigid_on/32/107_2.png) [@latigid\_on](https://forum.midibox.org/u/latigid_on)\ **Post date:** [April 22, 2021, 3:44pm UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/130 "2021-04-22T15:44:33Z")
Awesome! Glad that you could get to the bottom of it and that the caps didn’t explode too violently! ---
**Author:** ![ear\_ear](https://forum.midibox.org/letter_avatar_proxy/v4/letter/e/7bcc69/32.png) [@ear\_ear](https://forum.midibox.org/u/ear_ear)\ **Post date:** [February 1, 2022, 6:27pm UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/131 "2022-02-01T18:27:31Z")
Can anyone tell me the power consumption of these boards (Euroceiver, A1, D1, D2, D3)? ---
**Author:** ![latigid\_on](https://forum.midibox.org/user_avatar/forum.midibox.org/latigid_on/32/107_2.png) [@latigid\_on](https://forum.midibox.org/u/latigid_on)\ **Post date:** [February 1, 2022, 7:34pm UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/132 "2022-02-01T19:34:38Z")
[Modular grid](https://www.modulargrid.net/e/modules/browser?SearchName=&SearchVendor=811&SearchFunction=&SearchSecondaryfunction=&SearchHeight=&SearchTe=&SearchTemethod=max&SearchBuildtype=&SearchLifecycle=&SearchSet=&SearchMarketplace=&SearchIsmodeled=0&SearchShowothers=0&order=newest&direction=asc) has you covered! ---
**Author:** ![ear\_ear](https://forum.midibox.org/letter_avatar_proxy/v4/letter/e/7bcc69/32.png) [@ear\_ear](https://forum.midibox.org/u/ear_ear)\ **Post date:** [February 1, 2022, 7:38pm UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/133 "2022-02-01T19:38:25Z")
Aha, thanks very much! 🙂 ---
**Author:** ![jaytee](https://forum.midibox.org/user_avatar/forum.midibox.org/jaytee/32/442_2.png) [@jaytee](https://forum.midibox.org/u/jaytee)\ **Post date:** [March 12, 2023, 8:47pm UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/134 "2023-03-12T20:47:16Z")
Hey there getting some more work done on my euro modules that I hope to connect to my MB-6582 (I know Ive been working on this for like three years, lmao, always something else I need to do first).   Anyway, just trying to get a handle on the USB port on the euroceiver module. It is \*exclusively\* used as a 5V power input, correct? But…what is the intended use case for that scenario? with the onboard vreg \*and\* the option to get 5V from the euro power bus, I can’t think of why anyone would ever want to pump in 5V over USB from the front? Can the gate/CV modules also run from the USB 5v or something?   I’m designing my own panel that combines the euroceiver, one gate out module, and one CV out module. Is it chill to just leave the USB port off the board and close up that hole in the panel? or is there an important reason to keep it around that I’m just missing? ---
**Author:** ![latigid\_on](https://forum.midibox.org/user_avatar/forum.midibox.org/latigid_on/32/107_2.png) [@latigid\_on](https://forum.midibox.org/u/latigid_on)\ **Post date:** [March 13, 2023, 8:42am UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/135 "2023-03-13T08:42:02Z")
You can leave off the USB, it’s only an additional +5V power option selectable by jumper..  ---
**Author:** ![jaytee](https://forum.midibox.org/user_avatar/forum.midibox.org/jaytee/32/442_2.png) [@jaytee](https://forum.midibox.org/u/jaytee)\ **Post date:** [March 13, 2023, 7:23pm UTC](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605/136 "2023-03-13T19:23:10Z")
Thanks! [Previous page](https://forum.midibox.org/t/midiphy-eurorack-expander-modules/20605.md?page=6)