# HaraldsWerk Modulation Sequencer DIY **URL:** \ **Category:** DIY STUFF\ **Created:** [March 11, 2020, 5:41pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378 "2020-03-11T17:41:19Z")\ **Posts on this page:** 20\ **Page:** 1
**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:** [March 11, 2020, 5:41pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/1 "2020-03-11T17:41:19Z")
I made my own version of the [HaraldsWerk Modulation Sequencer](https://www.haraldswerk.de/CV_Sources/Modulation_Sequencer/Modulation_Sequencer.html). I use mini rather than banana jacks and I rebuilt the panel in EasyEDA to be able to get it made from PCB and have the correct dimensions for all the holes. Mine vs. the original: ![IMG_5957](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/1X/080e38d6b335e9e7ac73a4d140256cf419c61968.jpeg) ![Modulation_Sequencer_101_front](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/1X/238469fda71d4b93feb38efa389ecb9a6ebdfb04.jpeg) I may still do a v2 of the panel to fix some niggles. I would put a layer of copper on the front in order to have it show through the masked off logo at the bottom and I would reposition the board mounting holes to actually match the board. The original uses a mounting bracket and I’d rather just use standoffs. Also, the bottom left rack mounting hole is off to the left because I somehow missed it when repositioning the top hole to the standard Eurorack position. All in all, I’m pretty happy with the result. ![IMG_5956](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/1X/6804c99cf7cc77ed8ab9b2c7d3511ace68a83e1c.jpeg) ![IMG_5958](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/1X/31762942851c035cd336379adbba22c8c9d2fe25.jpeg) I’m going to replace the pots with switches and resistors on one of the modules to use it as a trigger sequencer. I’ll build at least one more the same as the first one so that I have two of those. PCBs from JLCPCB in two separate orders because I couldn’t wait for myself to finish the panel 🤪 ![Screen Shot 2020-03-11 at 10.23.12](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/1X/be111c8566b45d0eb48a42a540f0248e17ebe90d.png) ---
**Author:** ![sketchie](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/sketchie/32/144_2.png) [@sketchie](https://lookmumnocomputer.discourse.group/u/sketchie)\ **Post date:** [March 11, 2020, 5:55pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/2 "2020-03-11T17:55:03Z")
that looks really cool 👍 🕶 ---
**Author:** ![sketchie](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/sketchie/32/144_2.png) [@sketchie](https://lookmumnocomputer.discourse.group/u/sketchie)\ **Post date:** [March 11, 2020, 8:22pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/3 "2020-03-11T20:22:14Z")
would you be into sharing your panel files? 🙏 👍 🕶 ---
**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:** [March 11, 2020, 8:37pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/4 "2020-03-11T20:37:38Z")
Yes, but let me tweak the panel a little first. EasyEDA let’s you export a few formats, but not many. Gerber is one of them, though. ---
**Author:** ![sketchie](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/sketchie/32/144_2.png) [@sketchie](https://lookmumnocomputer.discourse.group/u/sketchie)\ **Post date:** [March 11, 2020, 9:45pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/5 "2020-03-11T21:45:38Z")
I shall wait patiently 🙏 👍 😀 ---
**Author:** ![Maxhirez](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/maxhirez/32/42_2.png) [@Maxhirez](https://lookmumnocomputer.discourse.group/u/Maxhirez)\ **Post date:** [March 11, 2020, 11:52pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/6 "2020-03-11T23:52:03Z")
I too am a fan of that circular layout. It looks to my novice eye like a buffered Baby 8-is that a fair description? ---
**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:** [March 12, 2020, 12:38am UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/7 "2020-03-12T00:38:08Z")
> [@Maxhirez](#): > > It looks to my novice eye like a buffered Baby 8-is that a fair description? That’s exactly right! ---
**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:** [March 12, 2020, 1:06am UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/8 "2020-03-12T01:06:02Z")
Here you go: [EasyEDA and Gerber formats](https://drive.google.com/open?id=1aZt6Tp_fKURc0JauryIcU6cBVTNX2XIL). ---
**Author:** ![sketchie](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/sketchie/32/144_2.png) [@sketchie](https://lookmumnocomputer.discourse.group/u/sketchie)\ **Post date:** [March 12, 2020, 1:46pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/9 "2020-03-12T13:46:38Z")
you’re a gentleman! thank you kindly 🙏 👍 🕶 😀 ---
**Author:** ![devicex](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/devicex/32/28_2.png) [@devicex](https://lookmumnocomputer.discourse.group/u/devicex)\ **Post date:** [March 12, 2020, 11:55pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/10 "2020-03-12T23:55:49Z")
Thanks for sharing this, looks like a fun build . did you use the same circuit pcb files as the Haraldswerk seq. ? if not would you possibly share those files as well ? . ---
**Author:** ![JonGreen](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/jongreen/32/203_2.png) [@JonGreen](https://lookmumnocomputer.discourse.group/u/JonGreen)\ **Post date:** [March 13, 2020, 12:17am UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/11 "2020-03-13T00:17:35Z")
Oh, now that looks polished! Nicely done good sir! ---
**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:** [March 13, 2020, 2:29am UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/12 "2020-03-13T02:29:13Z")
Yes, I just used the Gerbers from his site. It leads to a little bit of a funky power workaround, but it actually saves components to be on 12v in this case: ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/1X/c1e0f098e2cd912f20ca5c302a2c327dd063a1ed.jpeg) ---
**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:** [September 2, 2020, 11:59am UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/13 "2020-09-02T11:59:38Z")
For this BC550C transistor ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/4/4bab8d3be7febc26f22ee93261e87b30d04b57a7.png) and the 7 like it… That’s just an NPN switch and a BC550B or even a 2n3904 ~~(same pinout)~~ would work just fine, right? [_Edit:_ Wrong about the pinout, I Googled too hastily, 2n3904 is reversed from BC550 and would have to be installed “backwards”.] (Don’t even get me started on the 10k, 11k, and 12k resistors.) ---
**Author:** ![fredrik](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/fredrik/32/682_2.png) [@fredrik](https://lookmumnocomputer.discourse.group/u/fredrik)\ **Post date:** [September 2, 2020, 12:03pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/14 "2020-09-02T12:03:21Z")
2N3904 is backwards (and has lower gain) but this looks like an “any small-signal transistor should work” case. ---
**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:** [September 2, 2020, 3:15pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/15 "2020-09-02T15:15:22Z")
I’ve built it with both and they work just fine ---
**Author:** ![THOGRE](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/thogre/32/5189_2.png) [@THOGRE](https://lookmumnocomputer.discourse.group/u/THOGRE)\ **Post date:** [September 2, 2020, 3:50pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/16 "2020-09-02T15:50:08Z")
Very good job, I think your panel is a little prettier. It could be because his banana sockets are colorful, that somehow doesn’t fit. Again, good job! ---
**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:** [October 26, 2020, 1:20pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/17 "2020-10-26T13:20:44Z")
Getting ready to wire this. If there’s anything in the documentation explaining the Molex terminal orderings I can’t find it. I stared at the Gerbers and came up with this, let me know if you spot an error. ![molex](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/f/f8fe26d47f1d4b46ff226e0c98ae4b7a3ebfb5ec.png) ---
**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:** [October 26, 2020, 2:42pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/18 "2020-10-26T14:42:56Z")
I’ll check on mine and report back… ---
**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:** [October 27, 2020, 6:52pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/19 "2020-10-27T18:52:50Z")
OK, you have everything right, except you should connect 1-7, not 2-8. ---
**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:** [October 27, 2020, 7:31pm UTC](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378/20 "2020-10-27T19:31:19Z")
Sorry, I was unclear. For the rotary switch the numbers refer to the numbering on the panel, not the component pin numbers. Thanks! [Next page](https://lookmumnocomputer.discourse.group/t/haraldswerk-modulation-sequencer-diy/378.md?page=2)