HaraldsWerk Modulation Sequencer DIY

DIY STUFF
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I made my own version of the HaraldsWerk Modulation Sequencer. 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
IMG_59574032Ă—3024 2.28 MB
Modulation_Sequencer_101_front
Modulation_Sequencer_101_front1059Ă—978 122 KB

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
IMG_59564032Ă—3024 2.72 MB
IMG_5958
IMG_59584032Ă—3024 2.17 MB

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 :crazy_face:

Screen Shot 2020-03-11 at 10.23.12
Screen Shot 2020-03-11 at 10.23.122136Ă—1074 344 KB

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that looks really cool :+1: :sunglasses:

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would you be into sharing your panel files? :pray: :+1: :sunglasses:

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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.

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I shall wait patiently :pray: :+1: :grinning:

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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?

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That’s exactly right!

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Here you go: EasyEDA and Gerber formats.

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you’re a gentleman! thank you kindly :pray: :+1: :sunglasses: :grinning:

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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 ? .

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Oh, now that looks polished! Nicely done good sir!

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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
image3024Ă—4032 3.25 MB

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For this BC550C transistor
image
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.)

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2N3904 is backwards (and has lower gain) but this looks like an “any small-signal transistor should work” case.

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I’ve built it with both and they work just fine

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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!

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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
molex1200Ă—748 116 KB

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I’ll check on mine and report back…

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OK, you have everything right, except you should connect 1-7, not 2-8.

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Sorry, I was unclear. For the rotary switch the numbers refer to the numbering on the panel, not the component pin numbers. Thanks!

1 Like