JH Living Vocoder [BUILD THREAD]

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bsilverberg
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Post by bsilverberg » Tue Apr 11, 2017 7:42 am

Good news...it didn't blow up! Decided to use two old patch panels gathering dust as my "panel." The upside is, once complete I'll be able to rackmount it. Still ways to go, waiting on parts, finalizing values, etc., but it works!Image

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Techman
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Post by Techman » Tue Apr 11, 2017 7:48 am

bsilverberg wrote: but it works!
:bananaguitar: :bananaguitar:

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Starspawn
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Post by Starspawn » Tue Apr 11, 2017 9:34 am

My PCB is nearly done, and Ive got a panel lazertranned and ready, just have to finish term paper and get some free time ...

The basic design is this, made to match my other Yamaha looking 5U stuff.
Image

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GryphonP3
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Post by GryphonP3 » Wed Apr 12, 2017 1:41 pm

Someone, sell me a PCB! You know it will just sit around in your back drawer for 20 years! :deadbanana:

Great to see people making progress with this!
My cat can eat a whole watermelon ...

bsilverberg
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Post by bsilverberg » Thu Apr 13, 2017 4:43 am

Let the troubleshooting begin... Noise trim has no effect. Voltages around the bc550's all look right, what else should I look for? Should I be able to hear or see white/pink noise at a particular point? Also, Attack / Release trims affect nothing, same question. Everything else seems responsive! Thanks for any help you can provide.

bsilverberg
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Post by bsilverberg » Tue Apr 18, 2017 7:30 am

Update: its a dense board, I missed some of the part substitution recommendations, so all good now on the previous issues. On to calibration. Any tips?

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Reese P. Dubin
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Post by Reese P. Dubin » Mon May 22, 2017 7:26 pm

Have the PCB I will be building for a friend in my possession.
Its big.

Going to begin to collect every note available before soldering component number one, even tho I want to start SO BAD

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the bad producer
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Post by the bad producer » Mon May 22, 2017 7:28 pm

I think you could comfortably crack on with the caps on the back!

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the bad producer
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Post by the bad producer » Mon May 22, 2017 7:30 pm

Actually - and apropos of nothing in particular - seeing these made me realise I could actually maybe 'properly' finish mine with a properly nice panel:

Image

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Reese P. Dubin
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Post by Reese P. Dubin » Tue May 23, 2017 8:58 am

Repro Rogans???
WHERE?

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the bad producer
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Post by the bad producer » Tue May 23, 2017 9:23 am


bsilverberg
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Post by bsilverberg » Wed May 24, 2017 8:14 am

Agreed, start with the bypass caps or sockets. There's plenty of rote assembly to be done before you need to start worrying about the debugging portion. That's where I'm at now trying to figure out why the filterbank is just filtering noise and picking up local radio stations!?

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Reese P. Dubin
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Post by Reese P. Dubin » Sat Jun 24, 2017 11:38 am

I have the filter bands all populated except for the 1% caps and trimmers. Not bad at all, its so organized it goes very easy. SO is there somewhere in the world a component overlay with PART NUMBERS? I want to start filling in the various control sections with the newly recommended part values, but figuring out whats what is VERY difficult!

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Starspawn
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Post by Starspawn » Sat Jun 24, 2017 11:41 am

one of the earlier posts has links to three pictures from electro music with those relevant parts numbers.
(last post page 9)

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Reese P. Dubin
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Post by Reese P. Dubin » Sat Jun 24, 2017 11:23 pm

Huge thanks, I am getting worse all the time at detail combing

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Techman
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Post by Techman » Fri Jun 30, 2017 7:30 am

Finally got this beast cased :guinness: Image

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Luka
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Post by Luka » Fri Jun 30, 2017 7:34 am

wow that is a massive box techman

i just finished my backlog and am about to get back into this

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wiperactive
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Post by wiperactive » Fri Jun 30, 2017 8:17 am

Really admire those that have the skills and bravery to take this on. Techman's build looks every inch 'classic vocoder'. Always wanted something like the big Sennheiser/EMS models and this promises something similar.

I do hope that this goes on to be available as an updated PCB based project for those like myself who don't quite have the knowledge and trouble shooting skills to deal with it as it is.

JanneI
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Post by JanneI » Fri Jun 30, 2017 8:46 am

Luka wrote:wow that is a massive box techman

i just finished my backlog and am about to get back into this
Nice build! I hope I'll have enough time to start this thing too!

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Reese P. Dubin
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Post by Reese P. Dubin » Fri Jun 30, 2017 10:55 am

That looks great. Wasnt sure knobs would do it justice, but this is pretty convincing.

As far as updating/improving the PCB for the less adventurous, i dont think there is really anything to do it, other than change the values of the components that the trailblazers have worked out.

Hoping to have the one I am doing done by fall. Finding it fun to take projects more slowly than I have in the last ten years, at least the giant ones.

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Eric the Red
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Post by Eric the Red » Fri Jun 30, 2017 11:46 am

Anyone know if there will ever be another run of these boards? I would love to build this monster.

-Eric
Abandon all hope, ye who wiggle.

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LektroiD
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Post by LektroiD » Fri Jun 30, 2017 2:05 pm

Techman wrote:Finally got this beast cased :guinness: Image
Nice work! Do you have any photos of various stages of your case build?

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Techman
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Post by Techman » Fri Jun 30, 2017 3:43 pm

LektroiD wrote:
Nice work! Do you have any photos of various stages of your case build?
Do I f***. Sorry. It's just a 5U case 500mm deep which I painted in a textured Matt black. Back panel has an iec mains inlet and also has the toroidal transformer and psu transistors. I'll post a piccy of the back tomorrow.

I do my builds in the loft, and this is a bit like building a yacht in your basement. Not sure how I'll get it out again :eek:

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Techman
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Post by Techman » Fri Jun 30, 2017 6:37 pm

double post :doh:

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Techman
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Post by Techman » Sat Jul 01, 2017 5:59 am

Image
Image
Image

More pictures showing the gory details of the inside and round the back. If anyone wants the front panel details then I've attached the fpd file. :tu:
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