# My build progress **URL:** \ **Category:** DIY STUFF\ **Created:** [March 1, 2020, 8:57pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345 "2020-03-01T20:57:53Z")\ **Posts on this page:** 20\ **Page:** 5
**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 26, 2020, 5:56pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/81 "2020-03-26T17:56:30Z")
I built a commercially available Eurorack module based on that circuit — there are some changes but that was the starting point. Nice thing about it is it has trimmers on each output for calibration, rather than just a fixed gain that’s _supposed_ to be unity. And in fact I intentionally “miscalibrated” one channel on mine to slightly more than unity gain to get around a problem with the Mother-32 control voltage. If you’re so inclined you could buy the PCB and use it to make a Kosmo module. (But you have to buy the Eurorack panel with it.) > **[horstronic buffered multiple v2.1](https://synthcube.com/cart/horstronic-buffered-multiple)** > > This is a precision Buffered Multiple, originally designed by Dave Jonespcb v2.1aluminum panel with black graphicsbuild thread: buffered mult Or you could even buy the kit, but be aware if you do: The PCB allows for either through hole or 1208 SMT resistors and capacitors; the kit comes with SMT resistors and THT capacitors, for some reason. Also it’s missing a few components because SynthCube was working off the BOM for an earlier version. I wasn’t ready for SMT at the time so returned the kit and sourced my own parts. ---
**Author:** ![CTorp](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/ctorp/32/15023_2.png) [@CTorp](https://lookmumnocomputer.discourse.group/u/CTorp)\ **Post date:** [March 26, 2020, 6:25pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/82 "2020-03-26T18:25:40Z")
Pretty sure you could have both a 3.5 and 1/4” wired to each other on the out of the buffered multiple and it would still work as intended unless you pulled a signal from both? I could be off here ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/e/ea70286833564d3591a0d4a349c1427b06e9becc.jpeg) ---
**Author:** ![CTorp](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/ctorp/32/15023_2.png) [@CTorp](https://lookmumnocomputer.discourse.group/u/CTorp)\ **Post date:** [March 26, 2020, 6:30pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/83 "2020-03-26T18:30:13Z")
No kidding! I’m glad it’s a decent design! I also like the trimmer adjustments and the fact that each out gets independently buffered. Saw some other “buffered multiples“ that seem like they aren’t really buffered. This was more just a jump off point to learn kicad for me. I think I’m about half way there with probably 12 hours in 😁 ---
**Author:** ![Farabide](https://avatars.discourse-cdn.com/v4/letter/f/ecc23a/32.png) [@Farabide](https://lookmumnocomputer.discourse.group/u/Farabide)\ **Post date:** [March 26, 2020, 6:35pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/84 "2020-03-26T18:35:20Z")
Thanks. That makes sense. I built a 1/4" jack patch panel years ago (all switched) and that popped in my head when I saw the pictures. A buffered multiple is much more practical and safer. ---
**Author:** ![CTorp](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/ctorp/32/15023_2.png) [@CTorp](https://lookmumnocomputer.discourse.group/u/CTorp)\ **Post date:** [March 26, 2020, 6:39pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/85 "2020-03-26T18:39:58Z")
Like this design, wouldn’t adding more output cables and splitting the signal pull your voltage further and further away from the input voltage? ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/c/c490e4efddb700d18988de30b18093198b09424e.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:** [March 26, 2020, 6:41pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/86 "2020-03-26T18:41:33Z")
Yeah, that’s buffered in the sense that the input is buffered from the outputs, but the outputs are not buffered from each other. ---
**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:** [March 26, 2020, 6:56pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/87 "2020-03-26T18:56:29Z")
The opamp gets its feedback from before the 1k output resistors, so they’ll all see the same voltage. As long as you connect sane devices (i.e relatively high impedance inputs, decent cables) it should be fairly robust. ---
**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 26, 2020, 7:55pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/88 "2020-03-26T19:55:01Z")
When I’ve done it, I’ve just done parallel. ---
**Author:** ![Bitnik](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/bitnik/32/274_2.png) [@Bitnik](https://lookmumnocomputer.discourse.group/u/Bitnik)\ **Post date:** [March 26, 2020, 7:58pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/89 "2020-03-26T19:58:15Z")
> [@CTorp](#): > > Pretty sure you could have both a 3.5 and 1/4” wired to each other on the out of the buffered multiple and it would still work as intended unless you pulled a signal from both? I could be off here I think you should wire them in parallel if they’re open jacks, and in series if they’re switching jacks. The reasoning is that a switching jack will short the other jack it’s in parallel with, which is undesirable behaviour on an output and potentially extremely damaging in an input. If you’re using open jacks in parallel for an output, they’re basically a passive multiple. ---
**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 27, 2020, 3:13am UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/90 "2020-03-27T03:13:55Z")
cool I’ve built cigar box guitars , never thought about cigar box synths . you may be on to something , think I’ll have to try one . ---
**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 27, 2020, 4:14am UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/91 "2020-03-27T04:14:22Z")
This one’s done, now that I’ve gotten the pot connections the right way around. My first module based on PCBs of my own design, and first PCB front panel. ![IMG_20200327_000844](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/8/801ad41c923e39471859937e3dcdcb394a051e72.jpeg) ---
**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 27, 2020, 4:26am UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/92 "2020-03-27T04:26:54Z")
![20200326_2306201](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/1/147ede0aeb3a094fd6f6ae7ad6a1a5380afb3985.jpeg) got my mini ADSR’s done today just waiting on some smaller knobs that will somewhat match the bigger ones on the other modules . ---
**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 27, 2020, 10:09pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/93 "2020-03-27T22:09:49Z")
Posted a video ---
**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 27, 2020, 10:38pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/94 "2020-03-27T22:38:39Z")
Awesome video! So fun to see someone you’ve been interacting with online too 🙂 ---
**Author:** ![Farabide](https://avatars.discourse-cdn.com/v4/letter/f/ecc23a/32.png) [@Farabide](https://lookmumnocomputer.discourse.group/u/Farabide)\ **Post date:** [March 28, 2020, 4:31am UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/95 "2020-03-28T04:31:12Z")
Loved it! Any more laid back you’d be horizontal. Good to see you. ---
**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 28, 2020, 4:36am UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/96 "2020-03-28T04:36:40Z")
I’m kinda the antiSam. ---
**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 28, 2020, 5:21am UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/97 "2020-03-28T05:21:33Z")
Certainly a bit more measured 🤣 ---
**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:** [March 28, 2020, 9:43am UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/98 "2020-03-28T09:43:20Z")
the bigining of my 3rd cabinet panel cut, and an ADAR ![synthetiseur modulaire - preparatifs cabinet 3 - sound bender](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/7/75fcde12417fd0e0a3ddae4df14cdcf755f0c6fe.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:** [March 28, 2020, 1:54pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/99 "2020-03-28T13:54:21Z")
You might also detect a subtle difference in our front panel design preferences ---
**Author:** ![Bitnik](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/bitnik/32/274_2.png) [@Bitnik](https://lookmumnocomputer.discourse.group/u/Bitnik)\ **Post date:** [March 28, 2020, 4:06pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/100 "2020-03-28T16:06:34Z")
I appreciate the Art Deco lettering and the Bakelite-style knobs. [Previous page](https://lookmumnocomputer.discourse.group/t/my-build-progress/345.md?page=4) [Next page](https://lookmumnocomputer.discourse.group/t/my-build-progress/345.md?page=6)