The 2016 Show Us Your DIY Builds Thread

av500 · Post by **av500** » Sat Dec 17, 2016 5:02 pm

4hp triple attenuator/attenuverter using three Fonitronik attenuverter chicklet PCBs, modified by adding attenuator-only switches.

stringsthings · Post by **stringsthings** » Sat Dec 17, 2016 5:33 pm

Love that wood panel!

timpecter · Post by **timpecter** » Sun Dec 18, 2016 7:07 am

It's not really 100% complete without the rails and power installed but...

Laser cut 6U Eurorack cabinet with frequency modulated joints! The soot from the laser is pretty hard to get off. I'll give it a light sanding and coat it with polyeurethane. The only thing I botched is that it's approximately 1mm too short in the interior to fit the rails! I'll need to grind them down a touch to fit.

jsleeio · Post by **jsleeio** » Sun Dec 18, 2016 7:24 am

Looking good! Very happy to see the venting on the back. Going to paint it? Looks like ply, yes?

I've used polyurethane varnish on bamboo ply a bit, it turned out really nice after a few rounds of sand/coat/sand/coat/etc. Though on my more recent stuff I haven't bothered.

Silver · Post by **Silver** » Sun Dec 18, 2016 11:56 am

Vintage samsonite crocodile briefcase 8u

SlightlyNasty · Post by **SlightlyNasty** » Thu Dec 22, 2016 3:32 am

Well, there goes my last excuse for not writing the build docs...

flab · Post by **flab** » Thu Dec 22, 2016 9:12 am

4hp triple attenuator/attenuverter using three Fonitronik attenuverter chicklet PCBs, modified by adding attenuator-only switches.

. Can you explain your mod please, really interested

Starspawn · Post by **Starspawn** » Thu Dec 22, 2016 9:15 am

Id assume switch is for the input (middle leg) going to either chicklet or attenuator pot.

av500 · Post by **av500** » Thu Dec 22, 2016 9:20 am

not quite

the switch makes the cut marked here:

and thus converts the attenuverter into a simple buffered attenuator.

note, this is not the chicklet schematic, since it has a "do not reproduce" note on it, it's a generic attenuverter...

flab · Post by **flab** » Thu Dec 22, 2016 9:27 am

so you just connect a switch from the pad to the one leg of a standing resistor

av500 · Post by **av500** » Thu Dec 22, 2016 9:29 am

flab wrote:so you just connect a switch from the pad to the one leg of a standing resistor

on the chicklets there is actually a resistor and a trimmer, I cut the trace between them and wired the switch inbetween.

flab · Post by **flab** » Thu Dec 22, 2016 10:29 am

thanks for the asnwer, is that between R3 and leg 1 from the trimpot?

hermbot · Post by **hermbot** » Thu Dec 22, 2016 10:33 am

Hmm does this count? I modified a Rast rack to add a 1U space, giving me 7U total:

The whole album is here:

av500 · Post by **av500** » Thu Dec 22, 2016 10:36 am

flab wrote:thanks for the asnwer, is that between R3 and leg 1 from the trimpot?

yes

snaper · Post by **snaper** » Thu Dec 22, 2016 3:22 pm

SlightlyNasty wrote:Well, there goes my last excuse for not writing the build docs...

You should start finally talking moooore about these

sanders · Post by **sanders** » Fri Dec 23, 2016 1:17 pm

SlightlyNasty wrote:Well, there goes my last excuse for not writing the build docs...

Just beautiful. two wave shapers, and symmetry control? excellent.

Is this an available design? modified Buchla 258?

sanders · Post by **sanders** » Fri Dec 23, 2016 1:22 pm

snaper wrote:
SlightlyNasty wrote:Well, there goes my last excuse for not writing the build docs...
Just beautiful. two wave shapers, and symmetry control? excellent.

Is this an available design? modified Buchla 258?

PWM · Post by **PWM** » Fri Dec 23, 2016 2:27 pm

SlightlyNasty, What a looker!

cygmu · Post by **cygmu** » Fri Dec 23, 2016 4:08 pm

sanders wrote:
SlightlyNasty wrote:Well, there goes my last excuse for not writing the build docs...
Just beautiful. two wave shapers, and symmetry control? excellent.

Is this an available design? modified Buchla 258?

Take a look at SlightlyNasty's other posts and prepare to be impressed.

Jarno · Post by **Jarno** » Fri Dec 23, 2016 4:37 pm

Silver wrote:Vintage samsonite crocodile briefcase 8u

Nice suitcase! What's that, 60ies?

SlightlyNasty · Post by **SlightlyNasty** » Fri Dec 23, 2016 7:00 pm

Thanks guys! You can definitely expect to hear more about these in the very near future, now that I've got some skin in the game (those panels aren't cheap to manufacture!)

sanders wrote:Just beautiful. two wave shapers, and symmetry control? excellent.

Is this an available design? modified Buchla 258?

It's a completely original design, using only discrete transistors (BC550, BC560, and a couple of 2N7000 FETs). The actual underlying architecture is a fairly vanilla sawtooth-core design, but reimplementing everything in simple discrete circuitry gives it some nice character (and some quirks!)

Panels and PCBs should be available soon, I just need to make some very minor final tweaks to the PCB and write up the build docs as I mentioned. I should also get a few more demos up once I've completed the multimode filter I'm currently working on.

jsleeio · Post by **jsleeio** » Fri Dec 23, 2016 7:21 pm

Euro version of that VCO in the future? It looks fab

Jop · Post by **Jop** » Sat Dec 24, 2016 2:23 am

Yocto with Altitude909 Nava knobs

cygmu · Post by **cygmu** » Sat Dec 24, 2016 5:45 am

SlightlyNasty wrote: Panels and PCBs should be available soon

Tremendous! Not that I have a shortage of things I want to build, but it has been really fun watching your designs emerge and I'm excited to try them out.

PWM · Post by **PWM** » Sat Dec 24, 2016 9:06 am

Jop, sexy!

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The 2016 Show Us Your DIY Builds Thread