# Frequency Central MicroBus PCB Help **URL:** \ **Category:** DIY STUFF\ **Created:** [February 18, 2022, 6:24pm UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671 "2022-02-18T18:24:34Z")\ **Posts on this page:** 16\ **Page:** 2
**Author:** ![Farabide](https://avatars.discourse-cdn.com/v4/letter/f/ecc23a/32.png) [@Farabide](https://lookmumnocomputer.discourse.group/u/Farabide)\ **Post date:** [February 19, 2022, 10:29pm UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/21 "2022-02-19T22:29:26Z")
I’m hoping for the soundbender calendar next Christmas. ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [February 19, 2022, 11:10pm UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/22 "2022-02-19T23:10:10Z")
🎄 🎅 oh oh oh ! ![modular calendar 2023 sound bender](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/d/d/dd557cd3b4fd84df9d14ae0de147394c708dd7f1.jpeg) 🤣 ---
**Author:** ![MegaloDane](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/megalodane/32/26631_2.png) [@MegaloDane](https://lookmumnocomputer.discourse.group/u/MegaloDane)\ **Post date:** [February 24, 2022, 3:38pm UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/23 "2022-02-24T15:38:43Z")
This is the one I got. It’s only 1.5 amps, but I think that’s not bad for the PSU. > **[Amazon.com: Jameco Reliapro ADU120150E1012 AC to AC Wall Adapter Transformer 12V...](https://www.amazon.com/Reliapro-ADU120150E1012-Adapter-Transformer-Straight/dp/B09HL8W6LC)** > > Output connector Type: female 2.1mm inside diameter/5.5mm outside diameter straight plug. Jameco Reliapro ADU120150E1012 AC to AC Wall Adapter Transformer 12V @ 1500 mA Straight 2.1 mm Female Plug, Black ---
**Author:** ![unexpectedbowtie](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/unexpectedbowtie/32/10648_2.png) [@unexpectedbowtie](https://lookmumnocomputer.discourse.group/u/unexpectedbowtie)\ **Post date:** [February 24, 2022, 4:11pm UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/24 "2022-02-24T16:11:42Z")
Got my AC adaptor today from MyVolts and both PSUs work fine. I checked with a multi-meter and getting respectable readings from the expected places. 😃 ---
**Author:** ![MegaloDane](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/megalodane/32/26631_2.png) [@MegaloDane](https://lookmumnocomputer.discourse.group/u/MegaloDane)\ **Post date:** [February 24, 2022, 4:55pm UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/25 "2022-02-24T16:55:19Z")
Would you mind providing a link to the adapter you purchased? Thanks! ---
**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:** [February 24, 2022, 5:07pm UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/26 "2022-02-24T17:07:05Z")
![bitmap](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/c/6/c6770b08b1077f9e7f1b98c5072e41066b67e34f.png) Guess that’s the one I have too. Works, at least for several modules. I’m not sure if its limits are contributors to [this problem](https://lookmumnocomputer.discourse.group/t/psu-startup-problems/4296). ---
**Author:** ![unexpectedbowtie](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/unexpectedbowtie/32/10648_2.png) [@unexpectedbowtie](https://lookmumnocomputer.discourse.group/u/unexpectedbowtie)\ **Post date:** [February 24, 2022, 5:18pm UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/27 "2022-02-24T17:18:56Z")
Sure. > **[UK 12V myVolts Premium Power Supply compatible with Frequency Central...](https://myvolts.co.uk/product/75903/UK_12V_myVolts_Premium_Power_Supply_compatible_with_Frequency-Central_Eurorack-board_Microbus)** > > Need to power your Frequency Central Eurorack board Microbus? > > Get myVolts Premium power supply compatible with Frequency Central Eurorack board model Microbus > > Premium option includes 3 meter long extension lead and inline on/off switch. > > This new... I got the premium one with an extension and in-line switch which works great. ---
**Author:** ![Caustic](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/caustic/32/15588_2.png) [@Caustic](https://lookmumnocomputer.discourse.group/u/Caustic)\ **Post date:** [February 24, 2022, 7:13pm UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/28 "2022-02-24T19:13:14Z")
That’s the one I have as well. ---
**Author:** ![TylerTheFolf](https://avatars.discourse-cdn.com/v4/letter/t/c5a1d2/32.png) [@TylerTheFolf](https://lookmumnocomputer.discourse.group/u/TylerTheFolf)\ **Post date:** [February 25, 2022, 9:19am UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/29 "2022-02-25T09:19:50Z")
I had a weird issue with one where none of the leds lit up no matter what way they where in but i measured the pins and got the voltages i wanted so i said screw it and popped it in one of my boxes anyway ---
**Author:** ![SuperSci](https://avatars.discourse-cdn.com/v4/letter/s/e56c9b/32.png) [@SuperSci](https://lookmumnocomputer.discourse.group/u/SuperSci)\ **Post date:** [March 20, 2022, 8:54pm UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/30 "2022-03-20T20:54:42Z")
Hi folks, Total newb to electronics. I have managed to build a beautifully operating Kosmo-Euro hybrid, but now I want to expand and I need more power. I haven’t found any resource that clearly explains wiring the microbus in parallel (in a way a 4 year old could understand). Does anybody know where I might find such a resource? LMNC’s video on cases and power supplies flashes past it a little too quick for me. My plan is a case 4 rows high, 8 modules across. Some are half-size like the ADSR and dual buff multis, so it will be more like 12 modules per row. I figure I probably need 1 PSU per row. Is it reasonable to wire 4 microbuses in parallel, fed from the same wall-wart? Or is that going to demand too much from a 12v 1000ma wall-wart? Any help would be greatly appreciated! 😁 ---
**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:** [March 20, 2022, 9:24pm UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/31 "2022-03-20T21:24:08Z")
I’m seeing an average with my modules of about 35 mA (total on +12 and -12 V rails). Of course yours will probably differ, but using that, 12 modules per row comes to 420 mA. Add whatever your Eurorack demands from 5 V, if anything. The Microbus is rated to deliver ~500 mA (per rail, I _think_, which would be 1000 mA total), so one per row should be well within spec. But that’s 4 times 420 mA or 1680 mA delivered to the modules, in terms of power about 20 VA. That’s well beyond your 1000 mA wall wart. And in fact FC recommends a 1000 mA wall wart to power _one_ MicroBus. If each row’s pulling 420 mA, well under what the MicroBus is rated for, really that wall wart could probably power two PSUs, but not four. You can shop for a 2000 mA wall wart, but it might be easier just to use two 1000 mA or 1500 mA ones, two rows for each. As for how: > [@Power supplies choices?](https://lookmumnocomputer.discourse.group/t/power-supplies-choices/357/3): > > Assuming one AC wall wart and two FC power supplies, and that your wart has enough amps to power both supplies, you can connect them in parallel: same wire from the wart to AC1 on both supplies, the other to AC2 on both supplies. EDIT: See [this picture](https://lookmumnocomputer.discourse.group/t/power-supplies-choices/357/19). If you mix things up, you’ll short the supplies (see [this post](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-power-supply-bom/151/25) for why). ---
**Author:** ![SuperSci](https://avatars.discourse-cdn.com/v4/letter/s/e56c9b/32.png) [@SuperSci](https://lookmumnocomputer.discourse.group/u/SuperSci)\ **Post date:** [March 24, 2022, 12:38am UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/32 "2022-03-24T00:38:01Z")
That’s amazingly helpful! Thanks so much! ---
**Author:** ![TheDJT003](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/thedjt003/32/26293_2.png) [@TheDJT003](https://lookmumnocomputer.discourse.group/u/TheDJT003)\ **Post date:** [June 15, 2023, 6:44pm UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/33 "2023-06-15T18:44:37Z")
I’m new here, hello everyone. I am contacting you with a request regarding the DIY kit Frequency central micro bus, after powering all the cleaning components, I have 14.8V on the + 12V and - 12V pins and 5.8V on the + 5V pins It is normal ? I would hate to destroy a module. Does anyone have a solution where the problem is? Used regulators L7812CV, L7912CV, MC78L05 Use 12VAC, 0.5A Wallwart Thank you in advance for your help ---
**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:** [June 15, 2023, 10:57pm UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/34 "2023-06-15T22:57:30Z")
I suppose one has to ask: Did you check it with more than one multimeter? Or have you checked a known voltage source with the same multimeter? Could be it’s out of calibration and the PSU is fine. But if those measurements are correct then no, it’s not normal — regulation should be much better than that. But it’s odd because they’re different regulators for each voltage and _all_ of them are too high. Why would all three regulators be wonky like that? Are you measuring between regulator pin and ground? Using the VDC setting on the multimeter? ---
**Author:** ![TheDJT003](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/thedjt003/32/26293_2.png) [@TheDJT003](https://lookmumnocomputer.discourse.group/u/TheDJT003)\ **Post date:** [June 16, 2023, 2:39am UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/35 "2023-06-16T02:39:32Z")
Hallo , the truth is that I have a cheap multimeter , I will definitely try . I hadn’t thought of that . Thank you very much for your help and I really appreciate your time spent thinking about someone else’s thing. THANK YOU VERY MUCH. T003 ---
**Author:** ![TheDJT003](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/thedjt003/32/26293_2.png) [@TheDJT003](https://lookmumnocomputer.discourse.group/u/TheDJT003)\ **Post date:** [June 16, 2023, 2:58am UTC](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671/36 "2023-06-16T02:58:12Z")
yes man you are a genius , good news , I could not sleep until I solve it , I changed the batteries in the multimeter and I have + 12V and -12V and +5V , yes yes yes Thank you again T003 [Previous page](https://lookmumnocomputer.discourse.group/t/frequency-central-microbus-pcb-help/4671.md?page=1)