The 2021 Show Us Your DIY Builds Thread!

[Kelaifu]

Here are my latest Lego stuff...

I almost went full duplo when i started out, was trying to do something 'original' but in the end I failed to resist the convince of euro.

Made a duplo teensy midi controller for a friend though, so it wasnt a totally wasted effort!

[hox3d]

BA662DIY.jpg
My build of a BA662 clone based on the remarkable work of user @guest documented here.
A tiny pcb embedded in transparent epoxy resin. To be used in my 303 clone.

Wow, it looks so great ! Did you document the whole process (i.e especially with epoxy "casing" like that etc)?

[joeSeggiola]

Yep, this is just FR-4. I used the standard 1.6mm thickness, HASL (ROHS) process for the panel and ENIG for the control board. It does give a little if you really try to bend it, but with the jacks down at the bottom this isn't really a problem.

Cool, thanks for the reply. In fact, I just realized what makes my quote so pricey is the 2mm thickness process. I guess I'll try order some 1.6mm too and see how it goes.

[squarewavesurfer]

Hacked together a 10 channel passive voltage divider, specifically for converting 10V CV to 5V.

[Kelaifu]

Hopefully these images work, a couple of through hole boards I had spare that I soldered up using SMT where possible, just for the practice.

[waldenpotato]

I just finished the Oakley Sound Systems Dual VCO.

[formica]

Hey,

I just made this simple passive mult.

I designed the panel in OnShape CAD, and cut it on a CO2 laser cutter in walnut hardwood. Not sure if that is going to hold it's more brittle than I anticipated - I think I now know why most panels are aluminum

I used this schematic; https://aisynthesis.com/ai001-multiple-build-guide/

[DEEMARKAY]

Another tool missing from my modular was a slew limiter, so armed with the D107 schematic (http://www.dintree.com/#D107), I went ahead and made up a PCB and panel. I diverged from the schematics a bit to add in (buffered) red-green bi-colour LEDs for both the input and output which actually worked really well - visual feedback on what's happening to a signal is something I like to have .

I also built that slew limiter but found that the range of the knobs are really tight, meaning they completely cut out the signal already around 9 o‘clock. I played around with capacitor values. I understand that the low-pass filter at the core of the module just has a certain frequency response and corresponding roll-off. I wasn‘t really able to find a ratio that is useful across a variety of voltages though.

[dot matrix madness]

Hey,
I just made this simple passive mult.
I designed the panel in OnShape CAD, and cut it on a CO2 laser cutter in walnut hardwood. Not sure if that is going to hold it's more brittle than I anticipated - I think I now know why most panels are aluminum

hardwood is still stiffer than cardboard of the same thickness.

[twigathy]

Another tool missing from my modular was a slew limiter, so armed with the D107 schematic (http://www.dintree.com/#D107), I went ahead and made up a PCB and panel. I diverged from the schematics a bit to add in (buffered) red-green bi-colour LEDs for both the input and output which actually worked really well - visual feedback on what's happening to a signal is something I like to have .

I also built that slew limiter but found that the range of the knobs are really tight, meaning they completely cut out the signal already around 9 o‘clock. I played around with capacitor values. I understand that the low-pass filter at the core of the module just has a certain frequency response and corresponding roll-off. I wasn‘t really able to find a ratio that is useful across a variety of voltages though.

Ah weird. I have to admit I've only really played about with it in the first maybe third of the pot range. Perhaps a log potentiometer instead of a linear would help get more usable range out of it?

[forestcaver]

ssi2130 8hp module (also done an expansion module to support the vc-mixing on the ssi2130).

[ericneilj]

ssi2130 8hp module (also done an expansion module to support the vc-mixing on the ssi2130).

Looks great!

Are you hand soldering the QFN?

[forestcaver]

ssi2130 8hp module (also done an expansion module to support the vc-mixing on the ssi2130).

Looks great!

Are you hand soldering the QFN?

Thanks!

Yes - hand-soldering it... (well, lightly tinned the pads with an iron and solder wire, then hot air, then reflow the outer pads with an iron). It’s pretty easy to do tbh.

[OIP]

I designed the panel in OnShape CAD, and cut it on a CO2 laser cutter in walnut hardwood. Not sure if that is going to hold it's more brittle than I anticipated - I think I now know why most panels are aluminum

hell yeah, i made a lot of panels out of laser cut plywood (got lucky with a job having a fab lab on site) and it holds up surprisingly well over time. hardwood looks great.

would recommend putting the grain longways, it makes a significant difference to strength.

[formica]

I designed the panel in OnShape CAD, and cut it on a CO2 laser cutter in walnut hardwood. Not sure if that is going to hold it's more brittle than I anticipated - I think I now know why most panels are aluminum

hell yeah, i made a lot of panels out of laser cut plywood (got lucky with a job having a fab lab on site) and it holds up surprisingly well over time. hardwood looks great.

would recommend putting the grain longways, it makes a significant difference to strength.

Thanks a lot for the the tip on grain direction. I see that it is very important with small panels with holes in them

[Bodo1967]

A desktop drum synth consisting of the "Um-Tss" which was presented in this forum a while ago (4 years or so, actually), 3 SynTom II and 2 SynBal boards. All outputs are internally routed to a simple stereo mixer (modified version of an old MFOS design) which allows stereo panning. The thing runs on a 9 V wall wart. Each of the 8 instruments (the Um-Tss includes three) can be triggered individually. I used 8 instrument voices in total since that exactly suits the drum sequencer included in the Beatstep Pro.

Re: different and missing knobs - concerning pots I used what I had lying aroung, so there are to different shaft types => different knobs. And I ran out of Davies style (1900h, iirc) knobs so I am currently waiting for a shipment to arrive.

[Luka]

01IMGP3726.jpg

A desktop drum synth consisting of the "Um-Tss" which was presented in this forum a while ago (4 years or so, actually), 3 SynTom II and 2 SynBal boards. All outputs are internally routed to a simple stereo mixer (modified version of an old MFOS design) which allows stereo panning. The thing runs on a 9 V wall wart. Each of the 8 instruments (the Um-Tss includes three) can be triggered individually. I used 8 instrument voices in total since that exactly suits the drum sequencer included in the Beatstep Pro.

Re: different and missing knobs - concerning pots I used what I had lying aroung, so there are to different shaft types => different knobs. And I ran out of Davies style (1900h, iirc) knobs so I am currently waiting for a shipment to arrive.

Looks great!

[Luka]

Finished my Jurgen Haible Vocoder a few months ago

[soup]

Wow!

[Kampfzwerg]

MYSEM front

MYSEM back

Hey folks, it's been a while and I still need to fix some flaws but I was super excited about how
the screenprinted panel looks on the first of eight SEMs Im about to build.

Have a nice day