[IN STOCK] Manual Voltage Processor - 16hp of Euro utility

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xahdrez
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Post by xahdrez » Sat May 03, 2014 6:55 am

Swapping those SOIC chips worked fine, and much easier soldering them the second time round. Seems I also had a dodgy mixer chip - not sure if it was me or it was just faulty, but swapped that out an new one and it's working a treat! Great module, can see its gonna work it's way into all my patches!

Thanks for all the help Jason! :banana:

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negativspace
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Post by negativspace » Sat May 03, 2014 2:47 pm

Sweet! Glad you got all the issue ironed out. :party:

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Post by mouldi101 » Sun May 04, 2014 1:42 pm

I've finally got around to putting mine together, and of course immediately come up with a fault...

You wouldn't happen to have a schematic or possibly a PCB layout for the daughterboard about would you?

It seems that somehow, I've ended up with -24v on the ground section of the jacks on the daughterboard, and only 2 of the three LEDs are working correctly... How can it go so wrong?

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makers
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Post by makers » Sun May 04, 2014 3:25 pm

Quick question regarding the mixer section of this design...

I've scanned through the thread but didn't see anything.

Does the MVP use the same/similar mixer design as the 4hp MA MIX module?

Thanks!

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Post by negativspace » Sun May 04, 2014 10:49 pm

mouldi101 wrote:It seems that somehow, I've ended up with -24v on the ground section of the jacks on the daughterboard, and only 2 of the three LEDs are working correctly... How can it go so wrong?
Which LED isn't working? One of the two TL062s only handles a single LED - if that's the dead one then your issue is likely with or near that IC.

Have you used the continuity tester on your meter to check for shorts between power rails and ground? (Probably none since 2 LEDs work.)

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negativspace
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Post by negativspace » Sun May 04, 2014 11:31 pm

makers wrote:Does the MVP use the same/similar mixer design as the 4hp MA MIX module?
Same building blocks arranged a little bit differently...

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Post by mouldi101 » Sat May 10, 2014 12:01 pm

negativspace wrote: Which LED isn't working? One of the two TL062s only handles a single LED - if that's the dead one then your issue is likely with or near that IC.

Have you used the continuity tester on your meter to check for shorts between power rails and ground? (Probably none since 2 LEDs work.)
It's the one on the right (i.e. one of the ones using the TL062 that's shared... the other side is working though).

Will order myself a few more TL062s and find out...

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Post by bkbirge » Thu May 29, 2014 9:56 pm

I picked up a bunch of 16PJ138 connectors for this as the BOM said they'd work but they don't seem the same as the erthenvar ones as far as connections go, will these still work?

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Post by vicpop » Fri May 30, 2014 12:25 am

Image

Just finished mine, works nicely so far! I'm a little confused as to how I should be calibrating the trimpots though. Everything I've put through it sounds fine but I'd still like to know what I should be doing with them

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Post by negativspace » Fri May 30, 2014 3:35 am

bkbirge wrote:I picked up a bunch of 16PJ138 connectors for this as the BOM said they'd work but they don't seem the same as the erthenvar ones as far as connections go, will these still work?
Yes, the only difference is the ground tab. You'll want to run some bus wire to all of the jacks' ground tabs and then run that to one of the many open ground pads on the PCB. Odds are that the jacks will ground themselves via the panel if you omit this step, but best practice is not to leave that up to chance.

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Post by negativspace » Fri May 30, 2014 3:36 am

vicpop wrote:Just finished mine, works nicely so far! I'm a little confused as to how I should be calibrating the trimpots though. Everything I've put through it sounds fine but I'd still like to know what I should be doing with them
Looking good! :party:

The trimmers set the gain of the two mixer sections. I trim them for unity gain at max CW but you can trim them for more if you want.

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Post by bkbirge » Fri May 30, 2014 9:51 am

negativspace wrote:
bkbirge wrote:I picked up a bunch of 16PJ138 connectors for this as the BOM said they'd work but they don't seem the same as the erthenvar ones as far as connections go, will these still work?
Yes, the only difference is the ground tab. You'll want to run some bus wire to all of the jacks' ground tabs and then run that to one of the many open ground pads on the PCB. Odds are that the jacks will ground themselves via the panel if you omit this step, but best practice is not to leave that up to chance.
Cool, thanks, looking at the board and the connections it looks like all the ground tabs should be pointing down toward the bottom of the panel, I mean in terms of orientations so that the correct non-normalled tab is in the right place, is that correct?

Modular & Dork Rock:
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https://www.modulargrid.net/e/racks/view/88730
https://www.modulargrid.net/e/racks/view/89177
https://www.modulargrid.net/e/racks/view/379579


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Post by bkbirge » Fri May 30, 2014 10:17 pm

In progress pics, the smt components are a little rough but I think they are in ok, hopefully I didn't heatsink into them too much, just waiting on my Tayda order for the pots to finish, cool fun and quick project...

Image
Image
Image

Modular & Dork Rock:
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https://www.modulargrid.net/e/racks/view/88730
https://www.modulargrid.net/e/racks/view/89177
https://www.modulargrid.net/e/racks/view/379579


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Post by LektroiD » Mon Jun 02, 2014 3:41 pm

bkbirge wrote:In progress pics, the smt components are a little rough but I think they are in ok, hopefully I didn't heatsink into them too much, just waiting on my Tayda order for the pots to finish, cool fun and quick project...
Do yourself a huge favour and grab yourself a rework station and some solder paste from eBay...


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bkbirge
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Post by bkbirge » Mon Jun 02, 2014 4:50 pm

cool, definitely looks useful as more and more diy seems to be smd though I'm not sure about that manufacturer as apparently one was delivered with the mains voltage miswired to the gun casing itself. Amazing no one was killed.

I also like in the video how the inside of that rework station actually has zero smd parts itself, lol.

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https://www.modulargrid.net/e/racks/view/89177
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negativspace
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Post by negativspace » Mon Jun 02, 2014 5:10 pm

It's pretty easy to solder SOIC parts by hand but it definitely takes some practice. That's not bad for a first go.

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Post by bkbirge » Sat Jun 07, 2014 5:26 pm

Well I did indeed screw up one of the led drivers so need to re-order that part and as many others did I got the LED's backwards but the rest of it works, love the attenuverters!

Image

Modular & Dork Rock:
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https://www.modulargrid.net/e/racks/view/89177
https://www.modulargrid.net/e/racks/view/379579


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negativspace
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Post by negativspace » Sat Jun 07, 2014 10:13 pm

:party:

Strictly speaking you have the LEDs correct - I know the stoplight code teaches us that green is positive and red is negative but in the synth world the convention is reversed. :hihi:

All of the ones I build (and thus the retail version) are +R/-G. Same with the CVPs, and same with fonik's MH01 and several other bipolar modules I'm aware of.

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Post by bkbirge » Sat Jun 07, 2014 10:59 pm

I was indeed thinking of go/stop, and have no problem with not having to dive in and resolder those LEDs. I love how the LEDs track the pos/neg input, very cool feature. It is definitely a must have module.

Modular & Dork Rock:
https://bkbirge.bandcamp.com/
Racks:
https://www.modulargrid.net/e/racks/view/88730
https://www.modulargrid.net/e/racks/view/89177
https://www.modulargrid.net/e/racks/view/379579


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Post by sd88me » Sat Jul 05, 2014 3:14 am

so was pretty hungover today, but had a go at putting together an MVP anyway... bad idea!

Just finished putting it all together and realised I had done it all backwards :bang:

I was wondering why everything wasnt quite lining up !! I had soldered all the jacks on the wrong side of the big PCB

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negativspace
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Post by negativspace » Sat Jul 05, 2014 3:22 am

Ack! Fortunately those are pretty easy to remove with a solder sucker, the holes are pretty big. :hihi:

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Post by sd88me » Sun Jul 06, 2014 5:16 am

still does not sound like fun :/

PMed you negativespace, wondering if you have any PCB sets in stock?

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xahdrez
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Post by xahdrez » Mon Jul 14, 2014 7:23 am

wait...are the LED's meant to light up when there is nothing plugged in? after months of using this and thinking i'd finished trouble shooting...its just occurred to me that I never tested to see if it generates an offset, and it doesn't light up until something is plugged into the input...gonna have to try when I get home, maybe those SOIC's are backwards after all! :doh:

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negativspace
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Post by negativspace » Mon Jul 14, 2014 5:26 pm

Yeah, the LEDs should light up at any setting other than 12:00 with nothing plugged in. If they light up with an input signal then the SOIC chips are OK. It'd be the LM78L05 that's suspect or the connections between its output and the switching lugs on the jacks.

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xahdrez
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Post by xahdrez » Tue Jul 15, 2014 7:50 am

Thanks Jason (for the on going support!) - will take a look into it, think this will get it all up to speed!

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