The 2020 Show Us Your DIY Builds Thread!

From circuitbending to homebrew stompboxes & synths, keep the DIY spirit alive!

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J3RK
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by J3RK » Fri Jun 05, 2020 1:30 pm

I had this cherry/purple heart wood case that my dad made me sitting around for the past couple of years. It was always too big to ship, so anything I built always went out in either boats or smaller cases. I decided to put some vector rails in one row for LW format modules, and start filling it up with all the things I have laying around that I built, and never used. (or finished up a couple of things that were sitting 90% built) I've decided to pull the sequencer panel out of the bottom section, put more rails in, and put more LW modules in, as I've mainly been sequencing with external sequencers, or just doing random stuff.

Are you lemon? Does your head come to a nub?

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Re: The 2020 Show Us Your DIY Builds Thread!

Post by twigathy » Sat Jun 06, 2020 11:22 am

Third module ever... This time, an attenuverter. The control PCB isn't one of my own layouts (It was sent to me by accident), and has a bit of a quirk that means the A and B pots and inputs/outputs are flipped. I designed a panel around it and finally got around to soldering it this afternoon. It seems to work! The only minor nit is that the PCB silkscreening for the panel got a bit chipped at one point, but I can live with that.
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Higher res photos here: https://photos.app.goo.gl/6zcztgo4FpR1wveC6
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indigoid
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by indigoid » Sat Jun 06, 2020 9:37 pm

edit: ignore this, found earlier post
Zap him again! ZAP THE SONOFABITCH AGAIN!

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Norgatron
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by Norgatron » Mon Jun 08, 2020 7:57 am

Edit - if you click on the images they are the right way round. Not sure why they rotate when attaching but they seem to be picking up the original orientation from the camera and no the corrected one.

It's been a while, but I'm back with a design of my own - almost...

Behold the YAMAWAH!
IMG_20200608_132307.JPG
If you have a spare Yamaha B75 organ that you bought just for a couple of the knobs you liked (only joking! Or am I??) then you could saw off the end of the board containing the Brass Wah section and make it into a VC LPF Eurorack module, like me!

The VCF inside this is the Yamaha iG02611, not the iG02610 found in the CS-01 mk1, but it's pin-for-pin. I did manage to get some control over the resonance by cutting a track but it flatly refused to self oscillate. I've also tried to figure out what this VCF actually is but I'm still unsure. It appears to be some kind of T based notch.

Anyway, the design evolved a bit during the build so the placement of controls is slightly off-kilter and I ended up with a wacky sideways arrangement so that I could use the Yammy era-specific control scales. I built-in scale and offset control because the Yamaha way is to single-side the supplies oneth negative, hence I needed an inverting amp anyway and the rest came along for the ride. the LED tell you when eth input is -ve so that you can offset it into the +ve so that the inverting op-amp can send it all fully negative.

It works pretty well but its cutoff frequency is only as high as about 10KHz. I might try changing some caps one day.

The panel is very rough laser-tran and I could probably do it again and fix the sketchy parts, but the rat-look seem to suit the hand drilled panel and the general air of make-do.
I was hoping to use this with my SS-30M strings project but it's not the right sound and now I'm building the Old crow RR480 CS-80 filter for that. I like it though. It's quite colourful and ballsy.
There's more on the process on my blog here: http://ss30m.blogspot.com/2020/05/fun-w ... s-pt1.html
and here: http://ss30m.blogspot.com/2020/05/fun-w ... s-pt2.html
and here: http://ss30m.blogspot.com/2020/05/fun-w ... s-pt3.html

More will follow there too.
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Yamaha SS30 strings - rack-mount with MIDI project - http://ss30m.blogspot.co.uk/

twigathy
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by twigathy » Mon Jun 08, 2020 4:17 pm

More soldering happened, this time with the added excitement of "all the diode silkscreens are backwards". I have NO idea how that happened. I basically just drew up Rene's "Fastest ADSR in the west" schematic in kicad, with the 1M pots change (https://www.schmitzbits.de/adsr.html).

If you really want to see some soldering gore, wrongly sized footprints etc., then click at your own risk: https://photos.app.goo.gl/GvXe7XN4XsYGQYW8A

Through building this module, I've learned a few things:
1. Check the size of the footprints against the size of components, carefully. I didn't realise 1/4w metal film resistors were so huge compared to their carbon film brothers.
2. Check the silkscreen against the schematic to make sure diode direction makes sense - and if it doesn't, fix it before sending off for PCBs to be made.
3. Sand the little blobs on the side of the PCB that the fab adds for panelling before building the thing and sticking knobs on!!!

In any case, here's the ADSR in 5hp, complete with a panel that I'm pretty pleased with.
adsr-cropped.jpg
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elmegil
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by elmegil » Mon Jun 08, 2020 4:28 pm

twigathy wrote:
Mon Jun 08, 2020 4:17 pm
More soldering happened, this time with the added excitement of "all the diode silkscreens are backwards". I have NO idea how that happened.
Your symbol has pins 1 & 2 as anode & cathode, but your footprint has pins 2 & 1 as the same.

Or vice versa, but basically the footprint and the symbol don't agree about which is anode and which is cathode.

I don't remember if this has happened to me with diodes, but it has happened to me with transistors and jacks.

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Re: The 2020 Show Us Your DIY Builds Thread!

Post by twigathy » Mon Jun 08, 2020 4:33 pm

elmegil wrote:
Mon Jun 08, 2020 4:28 pm
twigathy wrote:
Mon Jun 08, 2020 4:17 pm
More soldering happened, this time with the added excitement of "all the diode silkscreens are backwards". I have NO idea how that happened.
Your symbol has pins 1 & 2 as anode & cathode, but your footprint has pins 2 & 1 as the same.

Or vice versa, but basically the footprint and the symbol don't agree about which is anode and which is cathode.
Yup, I think you got it! The symbols were backwards from what I thought they ought to be. Which side do you think the anode and cathode ought to be here? :)
adsr-kicad.PNG
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elmegil
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by elmegil » Mon Jun 08, 2020 9:52 pm

My guess would be the slash indicates which way the diode "points" so pin 1 would be the cathode.

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das_Produkt
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by das_Produkt » Tue Jun 09, 2020 12:56 pm

I build some pedals for my new Microgranny and my tape stuff.

First a 5 input, 4 output matrix mixer. (Basically a CGS33 in a pedal.)
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Then an Echo Base. It sounds good, but I overetched the case.
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Lastly, a Wasp Filter. Learned a lot about etching with the Echo Base, it worked a lot better this time.
I need a black or yellow MXR style knob, the red one I'm using only temporarily, hopefully.
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Eloc
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by Eloc » Tue Jun 09, 2020 6:46 pm

I quite like the 'over-etched' one, that and the celtic knots give it an artifact kind of feel

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seal_cobblr
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by seal_cobblr » Wed Jun 10, 2020 4:57 am

Indeed! Great work

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chuckg
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by chuckg » Thu Jun 11, 2020 1:55 pm

I'll give another thumbs-up for the over-etched case. Looks badass!
….working on it.

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Dr. Sketch-n-Etch
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by Dr. Sketch-n-Etch » Fri Jun 12, 2020 12:09 pm

Here are some videos of my Frequency Shifter project. The concept of a Bode frequency shifter is discussed in the first video, the thing is demonstrated in the second video, and my final prototype is shown in the third video. For the final prototype, I added outputs for the onboard VCO ("sine" and "cosine" outputs) and created "Connector PCBs" to replace nearly all of the wiring. In a few days, I'll have some PCB-mountable jacks from Small Bear, and I'll put on a Jack PCB and eliminate wiring altogether.

I'm selling these for $450 US if anyone is interested.







Incidentally, those Lissajous figures in the third video are obtained by taking the SUM and DIFF outputs of the frequency shifter to the X and Y inputs of the oscilloscope. A sine wave from my homemade Rubicon is being fed to the input, and the different waveforms of the shifter are being selected to get the different figures.
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by sduck » Fri Jun 12, 2020 12:36 pm

Brilliant! Love it! Great videos!
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by steviet » Fri Jun 12, 2020 12:56 pm

Dr. Sketch-n-Etch wrote:
Fri Jun 12, 2020 12:09 pm
Here are some videos of my Frequency Shifter project.
:hail:
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by tele_player » Sat Jun 13, 2020 8:54 pm

First power up was today. So far, no unpleasant surprises.
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by Norgatron » Sun Jun 14, 2020 3:23 pm

Old Crow RR480 for Eurorack. 28 HP of CS-80 filter clone goodness.
IMG_20200614_132758.JPG
Boards from Modular Addict. Parts went down with no issues although I added some spacers between the panel and the pots and switches to get them aligned with the jack sockets. Worked first time and sounds amazing. Very happy with this!
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The BOM has a health warning on it. It's 4-5 years old and yet the instructions are still a bit off unfortunately. I will post a summary of the ammendments in the original build thread as there's never been one brought together and it's a bit hard to follow what is wrong.
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Yamaha SS30 strings - rack-mount with MIDI project - http://ss30m.blogspot.co.uk/

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Re: The 2020 Show Us Your DIY Builds Thread!

Post by bodmin-moor-boy » Sun Jun 14, 2020 6:20 pm

Hi Guys, a kind Super Deluxe Wiggler suggested I repost this build here to inspire more Wigglers!!

New to the forum, just finished my homebrew DIY modular.
Meaning to do it for years.
Mainly based on R.A.Penfold's Electronic Synthesiser Construction, Babani Publications, with a few other bits thrown in.
A couple of Chaos generators of my own design. A 16 bit sequencer like Ray Wilson but I went off piste, two gate/trigger channels mainly, also split CV range a bit to avoid Coarse/Fine pots.
Totally scratch built including case, rails and PSU.
I am Cornish and like the North Coast, so not East/West coast but North Coast Atlantic waves!
Very happy with the results but still learning to drive it.
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by Dr. Sketch-n-Etch » Thu Jun 18, 2020 11:09 pm

Hey bodmin-moor-boy, as the great Carla Lalli Music would say, that's pretty "gorge". That's my kinda DIY!

Really lovin' the ARPey knobs, too! (OK, they're not really very ARPey on closer inspection, but from a distance they give that 2500 vibe a little bit.)
this night wounds time,

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Re: The 2020 Show Us Your DIY Builds Thread!

Post by mome rath » Sat Jun 20, 2020 1:43 am

Norgatron wrote:
Mon Jun 08, 2020 7:57 am
Edit - if you click on the images they are the right way round. Not sure why they rotate when attaching but they seem to be picking up the original orientation from the camera and no the corrected one.

It's been a while, but I'm back with a design of my own - almost...

Behold the YAMAWAH!

IMG_20200608_132307.JPG


i love this! :love:
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by soup » Sun Jun 21, 2020 1:04 pm

A couple of really nice filters in banana frac, mahattan analog svvcf and yusynth minimoog...
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:banana: :nana:
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by sduck » Sun Jun 21, 2020 9:00 pm

This kit had been sitting in it's box since 2018 or so when it first came out - it kept being pushed back in the backlog. I got a pair of these in here for repair, and that kicked my butt into gear on this.
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by forrest » Fri Jun 26, 2020 1:22 pm

My first build from gerbers using eagle to figure out what I needed and where it went. Also my first panel design / manufacture, both from JLCPCB. It's a forestcaver SMD Benjolin. Got the labeling mixed up on the SQR/TRI outputs and would back the copper layer off a little bit under the mask next time, lots of lessons learned all around.
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Re: The 2020 Show Us Your DIY Builds Thread!

Post by skautkurt » Fri Jun 26, 2020 1:41 pm

Wow! That panel is so beautiful! Great combination with those knobs. Well done (I dont even have benjolin, but I want one hehe)

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Re: The 2020 Show Us Your DIY Builds Thread!

Post by Reese P. Dubin » Fri Jun 26, 2020 6:33 pm

forrest wrote:
Fri Jun 26, 2020 1:22 pm
My first build from gerbers using eagle to figure out what I needed and where it went. Also my first panel design / manufacture, both from JLCPCB. It's a forestcaver SMD Benjolin. Got the labeling mixed up on the SQR/TRI outputs and would back the copper layer off a little bit under the mask next time, lots of lessons learned all around.

IMG_3192.jpeg
Do you by chance have a non eagle doc for the parts layout? I have a few of these forestcaver PCBs. I forget where they came from and the silk is illegible in a number of zones. i really want to build them but am kind of stuck ATM.

looks awesome!

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