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 Forum index » DIY Hardware and Software » Thomas Henry designs
MPS wiring diagram for the Bridechamber Panel Layout
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marvkaye



Joined: Mar 14, 2011
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Location: Fla

PostPosted: Tue Oct 18, 2011 6:33 am    Post subject: Reply with quote  Mark this post and the followings unread

TheProf wrote:

If anyone knows of a good cheap source for the 'Tefzel' wore that will work in my 'Strip 'n Wrap' bit, (the ordinary 'Kynar' has problems, I'd be very happy.


Cheap...Tefzel... two words that don't often collide in the same sentence, almost an oxymoron. Just the same, what gauge(s) are you looking for?? I have a great electronics surplus place in Orlando where I buy almost all of my wire... I suspect they may have what you need.

<marv>
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moonagedaydream



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PostPosted: Mon Oct 31, 2011 12:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ok, so I got my panel in the mail today. I'm a little confused about which cv inputs to leave out to keep from killing my mps. Question are you guys talking about additional mods? or are these things that are marked on the panel that shouldnt be there...
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jumunius



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PostPosted: Mon Oct 31, 2011 1:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

The Noise CV is not supposed to be used, and in fact was left off the board.

But some people have added it without problems. I just added it to my build and didn't break anything yet. (Well, I did fry one chip but I think it fried due to a short.)

To add Noise CV, I just added a diode in series with the Noise CV signal to remove any negative voltages. This seems to work well for adding external percussive envelopes or square wave lfos, but works poorly for other LFO shapes since you lose the bottom half of the waveform.

I was also thinking that the better way to do this would involve putting the diode between the sum of CVs (frequency knob + sweep knob + noise CV input) and the pin of the 13700 that the cvs feed into. But I'm kind of a dilettante; people like Uncle Krunkus probably have a much clearer understanding of what would work best there. (I mean, if Thomas Henry took it out of his design there must have been good reason!)
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moonagedaydream



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PostPosted: Mon Oct 31, 2011 1:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

ok, thats what i thought from what i've read in the other thread. thank you. now this is the unmarked jack above impact, correct? so i also will not need the noise filter cv pot?
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Uncle Krunkus
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PostPosted: Mon Oct 31, 2011 1:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thomas didn't take it out of his design, it was never there.
The pads which give you the option of connecting to the summing point are just that. Pads which have been added at that point. Thomas never entertained the idea of adding these CV inputs, as he knew it could create problems.

I don't know what CVs are referred to on your panel. In Thomas' original design there were NO external CVs at all.

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moonagedaydream



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PostPosted: Mon Oct 31, 2011 1:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

http://www.bridechamber.com/Mega_Percussive_Synth.html

that is the panel i have. honestly i am kinda confused as to what the send and receive jacks are for, i hope the sends are not all cv inputs. does this mean i should leave off the shell cv, is it unsafe as well?
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jumunius



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PostPosted: Mon Oct 31, 2011 2:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

Uncle Krunkus wrote:
Thomas didn't take it out of his design, it was never there.


Sorry, yes, thanks for the clarification.

Quote:
I don't know what CVs are referred to on your panel. In Thomas' original design there were NO external CVs at all.


There's a Shell CV towards the bottom right of Sheet 3 of the schematics. But there's no Noise or Impact CV in the schematics.

-Jim
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jumunius



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PostPosted: Mon Oct 31, 2011 2:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

moonagedaydream wrote:
honestly i am kinda confused as to what the send and receive jacks are for, i hope the sends are not all cv inputs.


See Sheet 4 of the schematics. The idea is that you can process each voice (impact, shell, noise) separately before mixing them in the MPS. The design calls for switching jacks on the receiving end so that your signals bypass their respective send/receive jacks unless you have something plugged in.

A lot of people seem to have ignored these. Since panel space is not an issue for you, they seem useful enough to me to keep.
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moonagedaydream



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PostPosted: Mon Oct 31, 2011 2:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

well, looks like everything is cleared up for me. Thanks again guys!
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Uncle Krunkus
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PostPosted: Mon Oct 31, 2011 3:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

jumunius wrote:
There's a Shell CV towards the bottom right of Sheet 3 of the schematics. But there's no Noise or Impact CV in the schematics.

-Jim


Even the shell CV is a switch which controls whether the impact or noise sections are going to modulate it. It is not meant to be used as an external CV input.

I think Thomas put the send/recieve jacks there so you could send your CVs to an external VCA, VCF etc. and thereby have CV control of all three sections. Which, by the way, is a pretty good idea. As long as you have some external VCAs, VCFs, etc. to patch in.

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jumunius



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PostPosted: Mon Oct 31, 2011 4:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

Uncle Krunkus wrote:
Even the shell CV is a switch which controls whether the impact or noise sections are going to modulate it. It is not meant to be used as an external CV input.


Hmm, but there's a switching jack (J7) depicted on Sheet 3 of the schematics (and also listed as one of 4 switching jacks in the BOM).
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jumunius



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PostPosted: Mon Oct 31, 2011 4:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

Also a direct quote from Thomas's write-up at Scott Stites' page:

"Note too that an external control voltage can be added in via J7."
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Uncle Krunkus
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PostPosted: Mon Oct 31, 2011 6:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sorry, yes, you're right.
(I haven't studied these schems since I laid out the PCB, but it's all coming back to me now! Laughing )
It was the fact that this one simply went to the summing node that made us think an option for the other two summing nodes would be okay. Thomas, however, was adamant that it was a different story for the other summing nodes.

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jumunius



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PostPosted: Mon Oct 31, 2011 8:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

Uncle Krunkus wrote:
Sorry, yes, you're right.
(I haven't studied these schems since I laid out the PCB, but it's all coming back to me now! Laughing )
It was the fact that this one simply went to the summing node that made us think an option for the other two summing nodes would be okay. Thomas, however, was adamant that it was a different story for the other summing nodes.


Indeed, I think most people would have trouble remembering how to use the finished 18-knob module in a period of a couple years; if I wasn't working on this 2 weeks ago I wouldn't have much hope of remembering the schematics. Smile
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moonagedaydream



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PostPosted: Tue Nov 29, 2011 1:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

well, i've decided to add the extra noise cv, and just try remember not to use it. i couldn't stand the empty hole on the panel. so if i'm wiring in a diode, it should go from the noise cv jack, to ground, cathode facing ground? is this correct? and i'm assuming a NTE109 would work fine?
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jumunius



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PostPosted: Tue Nov 29, 2011 2:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

moonagedaydream wrote:
well, i've decided to add the extra noise cv, and just try remember not to use it. i couldn't stand the empty hole on the panel. so if i'm wiring in a diode, it should go from the noise cv jack, to ground, cathode facing ground? is this correct? and i'm assuming a NTE109 would work fine?


Only the sleeve terminal should go to ground if you want it to do anything. If you want to add the jack, you should do something more like connecting the noise CV jack (tip) to the diode, and the cathode end of your diode to the noise CV summing point (I think it's the junction around R64 but I may be misremembering -- the noise frequency pot connects here via resistor). The idea would be to prevent negative voltages from getting through. The result will be that the lower swings of CVs (like the bottom half of a sine LFO) gets flattened.

Don't know about the NTE109 specifically.

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netpusher



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PostPosted: Sun Jun 10, 2012 9:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for posting this! I used it to finally finish up my MPS. Though I am not sure why but the Impact section and LED stopped working. Possibly one of my IC's got damaged?
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jumunius



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PostPosted: Sun Jun 10, 2012 10:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

netpusher wrote:
Thanks for posting this! I used it to finally finish up my MPS. Though I am not sure why but the Impact section and LED stopped working. Possibly one of my IC's got damaged?


Probably just an intermittent wiring connection, header issue, etc. LED and impact are fairly exclusive. I'd check all your wiring first. Easiest thing to do is to lightly fiddle with your impact wires while powered on and see if that makes a difference, then go from there.

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netpusher



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PostPosted: Sun Jun 10, 2012 11:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Jim, I will give that try.
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netpusher



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PostPosted: Mon Jun 18, 2012 11:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

So I finally got a chance to do some trouble shooting on my MPS tonight. I am noticing that my IC4 (4046) is getting really hot! I am wondering if my R88 200K resistor might be bad. Anyone know if that might cause the 4046 to heat up or not?
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