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 Forum index » DIY Hardware and Software » Thomas Henry designs
The Thomas Henry Mega Percussive Synthesizer
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jumunius



Joined: Apr 19, 2010
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PostPosted: Tue Feb 01, 2011 2:16 am    Post subject: Reply with quote  Mark this post and the followings unread

casperelectronics wrote:
Did a bunch of range tweaking as well.
-increased filter resonance by switching the 20k range resistor (R46) with a 1k.


A lot of good tips there, thanks! I just "finished" my MPS tonight -- ok, it's bare metal... someday I will do a proper panel, and add some of those send/receive jacks plus a further mod here or there.

But I really appreciated the call-out to tweak R46. Added resonance ring really improves the noise filter, very useful for percussive sounds. However, in my build I found something more like 5.6k to be the right range. At 1k I was getting a bit too much distortion in the towards the top range of the pot, whereas at 5.6k, I can achieve a nice sharp ringing, and only on the very top 10% of the pot at LP setting do I start to get distortion.

For those interested, definitely give this a try. And if you, like me, are too lazy to desolder your board, just add a resistor between the leftmost (as seen from the rear) lug of your Resonance pot (R78) and ground. (This is the pad that connects to J16-8.) Since it will act in parallel with the existing 20k R46, a value of 8.2k achieves my desired setting of 5.6k (or so) and 1.1k would get you close to casperelectronics' 1k. Use a banana clip and try out a range to see what works for you. Check out response on both LP and BP too.
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Luka



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PostPosted: Mon Feb 14, 2011 1:47 am    Post subject: Reply with quote  Mark this post and the followings unread

hey does anyone know if i can alter the pcb so i can use 100k pots for every pot?

i have a tonne of pcb mount 100k pots and i want to use them before i puchase any more pots

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tommi



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PostPosted: Mon Mar 07, 2011 4:51 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi,
I feel like the noise output is a bit too low. Looking at the schematics i thougt i could maybe lower R66, or R61?

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jordroid



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PostPosted: Sat Apr 02, 2011 10:01 am    Post subject: Reply with quote  Mark this post and the followings unread

Luka wrote:
hey does anyone know if i can alter the pcb so i can use 100k pots for every pot?

i have a tonne of pcb mount 100k pots and i want to use them before i puchase any more pots


My semi uninformed answer is, maybe, but you would have to recalculate a bunch of stuff, and the non 100k pots may be there for a good reason.

The three 1 meg pots are variable resistors and control how quickly the EGs decay after a trigger pulse, a 100k pot here would cause them to decay much faster than the 1 meg pot, so maybe increasing the size of the associated cap would make the range workable? There is also a series resister in line with the pot, so you would probably want to mess with that as well to get the pot to feel nice. The noise decay, for instance looks like it is controlled by R12 and R95 in series, both in parallel with C22, maybe mess with them and see what happens? The potentiometers responsible for A,D and R functions of envelope generators are very often 1meg, my guess is that there is a good reason this is so.

The 10k pots seem to be there for impedance reasons? They are all voltage dividers, several of them hanging off transistor emitters, i'd be hesitant to mess with them before getting a more informed opinion than i am capable of, but the worst that could happen is the release of some magic smoke Twisted Evil I'm not sure about the sensitivity control R36, you could easily adjust the resistors on either side of it to have the same ratios? I think i remember reading that it took some tweaking to get the mixer section to work nicely, so messing with the 10k pots here may throw things off? It probably won't hurt anything to try adjusting the mixer section, but it seems like some work went into optimizing it.

This post is partially to answer your question to the best of my abilities, and partially to lure smarter people out, in the hopes that they will feel compelled to correct any misinformation i have given you Smile

regards,

jordan
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jordroid



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PostPosted: Sat Apr 02, 2011 10:04 am    Post subject: Reply with quote  Mark this post and the followings unread

tommi wrote:
Hi,
I feel like the noise output is a bit too low. Looking at the schematics i thougt i could maybe lower R66, or R61?


Try looking here http://www.birthofasynth.com/Thomas_Henry/Pages/MPS_project.html halfway down the page in the blue rectangle after "Here's a description of Sheet 1 in Thomas Henry's own words:", and this thread http://electro-music.com/forum/topic-47233.html

cheers,

jordan Smile
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tommi



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PostPosted: Sat Apr 02, 2011 6:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks jordan!
I had already readed Scott Stites explanation of the noise section and i ended up increasing the noise volume at the input of the LM13700.
R11, wich originally was 820 ohm, is there to pull down the volume of the noise to an acceptable level for the lm13700, wich can handle a maximum level of 20mV pp (talking about signal's average value).
Looking there with the scope it turned out that i could increase the volume. I calculated that, given the average value i measured r11 could be 2k. So i changed that resistor and now i have a better balance between the three voices.
cheers,
t

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Eraser127



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PostPosted: Mon Apr 11, 2011 12:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

Alright, i've got a bit of a problem:

i was busy moving my MPS from my cardboardbox to a 19" rackunit, when i accidentally touched a component (resistor? not sure) with my tweezers on the right side of the TL074 on the pcb. Now the MPS stopped working Sad I already replaced and tried the TL074, 4046 and the 2206 ic's but it's no good. Even when I replace one of the LM13700's it make's no use.

I looked at all the resistors and diodes and they seem to look fine. Could it be one of the transistors or something in the mixer area? I've gone over the scheme so many times that i've lost it right now.

Does anyone have an idea?

regards,

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Eraser127



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PostPosted: Tue Apr 12, 2011 8:48 am    Post subject: Reply with quote  Mark this post and the followings unread

I already checked the + and - voltages to the ic's and that's fine. Also in the cardboard box is worked fine
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unterbit



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PostPosted: Fri Apr 22, 2011 3:21 pm    Post subject: WiringSwitch#2,on MPS,HELP Reply with quote  Mark this post and the followings unread

Somebody can tell how he\she had wired switch#2,particularly Lp out,i cant find pad for it.
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jumunius



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PostPosted: Fri Apr 22, 2011 3:45 pm    Post subject: Re: WiringSwitch#2,on MPS,HELP Reply with quote  Mark this post and the followings unread

unterbit wrote:
Somebody can tell how he\she had wired switch#2,particularly Lp out,i cant find pad for it.


LP is J 16-5
Center is J14-7
BP is wired to Resonance "top" (where J16-6 is wired)
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Eraser127



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PostPosted: Sat May 07, 2011 5:00 am    Post subject: Reply with quote  Mark this post and the followings unread

Eraser127 wrote:
Alright, i've got a bit of a problem:

i was busy moving my MPS from my cardboardbox to a 19" rackunit, when i accidentally touched a component (resistor? not sure) with my tweezers on the right side of the TL074 on the pcb. Now the MPS stopped working Sad I already replaced and tried the TL074, 4046 and the 2206 ic's but it's no good. Even when I replace one of the LM13700's it make's no use.

I looked at all the resistors and diodes and they seem to look fine. Could it be one of the transistors or something in the mixer area? I've gone over the scheme so many times that i've lost it right now.

Does anyone have an idea?

regards,

Yay, I got some sound out of it, even though the voltages to the ic's were there it doesn't mean the ic's are good ( d'oh). I replaced the "shell" and "impact" lm13700 and they work ok now (although the ringmod give's no sound). I also tried it with the "noise" opamp but that doesn't change anything and when I turn up the noise volume I get a hum, so I also need to fix that. At least i'm happy I got some sound out of it again. I'll just go on with my quest for sound Razz

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worldbank



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PostPosted: Sun Jun 12, 2011 7:24 am    Post subject: Reply with quote  Mark this post and the followings unread

Heyy

i have 2 mps boards populated, now starting to wire them up.. but, as i look more of pics of your mps's i get more confused.. in some you have 4 pots for the noise section.. cutoff, res, decay, sweep.. some have also "sens" in there.. in some you have "center" ? whats going on.. what is this "center" ?

also.. is there somewhere clear instructions on how to add the separate trig inputs for the noise,impct and shell ?

thanks..
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jumunius



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PostPosted: Sun Jun 12, 2011 1:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

worldbank wrote:
Heyy
i have 2 mps boards populated, now starting to wire them up.. but, as i look more of pics of your mps's i get more confused.. in some you have 4 pots for the noise section.. cutoff, res, decay, sweep.. some have also "sens" in there.. in some you have "center" ? whats going on.. what is this "center" ?


The 4 pots for noise is the standard, exactly as you listed them. "Sens" is trigger sensitivity. I think casparelectronics was talking about adding separate triggers for each section, which is where the additional pot would come in. That would be a mod though and I don't think anyone has documented how to do that.

I don't know what "Center" is but maybe it's someone's term for "Ring Balance? Or BPF cutoff on the noise filter? For the most part, the Bugbrand wiring diagram found in this thread is the best resource in terms of official build wiring. But even it veers from the schematics. If you look back a couple pages I itemize a lot of the differences between Bugbrand's wiring and TH's original design. Comparing BB's wiring against the schematic (even if you aren't great w/ schematics) is a very useful exercise at this stage.
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rumpofsteelskin



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PostPosted: Tue Sep 20, 2011 12:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

hmmm.... just put together my (first!) MPS - is the impact generator 4046 meant to be triggered or is it just going all the time and the trig pulse opens the VCA? My impact generator sounds pretty weak and I can't figure out why......

definitely wouldn't be able to get the nice attack like here http://www.youtube.com/watch?v=6Tvn2nHs4lI
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jumunius



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PostPosted: Tue Sep 20, 2011 1:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

rumpofsteelskin wrote:
hmmm.... just put together my (first!) MPS - is the impact generator 4046 meant to be triggered or is it just going all the time and the trig pulse opens the VCA?


Yup, it should be going all the time. When you are in "locked" mode (as opposed to trigger mode), everything is essentially going at once -- Impact, Shell, Noise, Ring.

I don't know what's going on for you but impact should sound significantly louder than Shell, since Impact is a square wave and Shell is a triangle wave.
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rumpofsteelskin



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PostPosted: Wed Sep 21, 2011 4:13 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah this impact generator doe not sound right/good I think something's a miss here.... I would have expected the impact to be triggered - otherwise you run the risk of getting two transients in quick succession on some hits and only one on others, depending where the VCA turns on in the wave.... are there any sound files (just the impact generator would be good) or measurements anywhere for reference?
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jumunius



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PostPosted: Wed Sep 21, 2011 11:00 am    Post subject: Reply with quote  Mark this post and the followings unread

rumpofsteelskin wrote:
Yeah this impact generator doe not sound right/good I think something's a miss here.... I would have expected the impact to be triggered - otherwise you run the risk of getting two transients in quick succession on some hits and only one on others, depending where the VCA turns on in the wave.... are there any sound files (just the impact generator would be good) or measurements anywhere for reference?


If I understand your triggering concern correctly, wouldn't the problem exist for both voices? Meaning, in an ideal world wouldn't you be triggering both waveforms to start from zero at the same time?

As for sound files, I would normally be happy to do that but I've disassembled my MPS in order to mod it a little.
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Eraser127



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PostPosted: Tue Sep 27, 2011 5:00 am    Post subject: Reply with quote  Mark this post and the followings unread

Alright, finally continued with the MPS and got some sound but there are 2 problems:

1. the BP/LP switch doesn't work although i hear the noise generator doing it's work. It just doesn't filter.

2. i built the thing inside a 2he 19" rack, but i got a grounding problem. The test build was in a cardboard box (see earlier posts) so there was no grounding problem. However now it's inside a metal box i hear a hum. The grounding points of the pots/jacks (some metal pots) are all connected to a small print with one wire to the power supply:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Can someone help me to finally get this thing ready?

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TheAncientOne



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PostPosted: Thu Sep 29, 2011 1:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Might be worth putting a 'scope on your power supply line: with a 12V AC wall wart and half-wave rectification, there is a chance that the regs may be dropping out on load, momentarily.

Just a thought, not a certainty, but worth checking, in my opinion.

If you don't have a 'scope, then a DVM set on 'AC Volts' might show a reading, indicating ripple on the supply line, (for certain, use the DVM with a series capacitor, say 100n, to block DC - some 'true RMS' meters will read an AC + DC total).

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mosc
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PostPosted: Thu Sep 29, 2011 7:32 am    Post subject: Reply with quote  Mark this post and the followings unread

TheProf wrote:

If you don't have a 'scope, then a DVM set on 'AC Volts' might show a reading, indicating ripple on the supply line, (for certain, use the DVM with a series capacitor, say 100n, to block DC.


Great suggestion, Mike. A very simple idea that I've not heard before. And I thought I knew everything. Wink

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Eraser127



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PostPosted: Sun Oct 02, 2011 6:17 am    Post subject: Reply with quote  Mark this post and the followings unread

Ok, checked the voltage and that seems to be fine. I've got the potmeters wired in a "star" shaped ground (all going to a print and one wire from print to J12). I also had to ground pin 12 of IC1 (LM13700) otherwise the noise won't trigger.

I'm glad the thing makes sound, but I want to completely get rid of the hum and want the LP/BP filter to work again. Sad

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TheAncientOne



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PostPosted: Sun Oct 02, 2011 8:28 am    Post subject: Reply with quote  Mark this post and the followings unread

OK: Formal fault finding mode.

1) Have you got some high impedance headphones? If so, wire them to the output. Don't hit trigger! Can you still hear a hum? If no hum, then the problem is a ground loop between the MPS and your mixer/amp. Check cabling and system earthing.

2) Did you wire the break jacks? Get 3 shorting jacks (standard jack with tip and sleeve shorted, just short them with a couple of turns of wire or a croc clip lead). Plug them into the 'mixer in' jacks and listen again - still humming? then the problem is most likely the MPC power supply, since all you are listening to is the output mixer. If you don't have the jacks, just turn all 3 level controls to zero. Shorting jacks just make it more certain.

3) Pin 12 of IC1 is the output stage before the buffer. IC1 IS the filter, short the output to ground and you will get nothing, (and you may well have fried the chip too).

4) I'm assuming that you do have trigger on the shell and impact circuits here. To check trigger on the noise: put your DVM across the Noise Filter Sweep pot, (R37, 10K). set the noise decay long, and trigger the MPC. You should get a sudden rise in voltage that decays away. The decay time is variable with R95. If this doesn't happen, check that you haven'y got D1 in backwards, and that C22 is good.

5) To If you get a triggered voltage shift across R37, then it may be that the noise VCA, or it's drive circuit is a problem. First lock the system up, with S1, and turn the shell and impact levels to zero. Check that you have over 5V across R37. You can check the VCA, by powering down, disconnecting the wiper wire of S2, and linking it temporarily, via a 100n cap to the collector of Q2, (if you have a scope, just check Q2 collector to make sure you actually do have some noise in the first place - I'm assuming you have). If you get unfiltered noise on power up, then switch to triggered and see if you get envelope shaped noise at the output. If you don't, then replace IC1, and relink S2, making sure you remove the short from pin12 to ground, first.


Hope this helps

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jumunius



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PostPosted: Sun Oct 16, 2011 2:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

casperelectronics wrote:

I added a second decay circuit in the impact section to control the amplitude decay (labeled ADCY).


Question for casparelectronics and anyone else who has added additional decay circuitry:

Did you notice any reduction in the sweep/VCA envelope ranges when adding an envelope? I've tried to add 3, all pretty closely replicating the section from the diode (junction of D1/D2/D6) through to the 100k resistor at the CV junction (R65, etc.) The result appears to reduce the oomph of the VCA a bit, as well as the range that the various voices' envelopes sweep.

It appeared that reducing the resistor that feeds the envelope to the CV summing / inverting opamp (e.g. R65) a bit helps the CV sweeps, and maybe something similar could be done for the VCAs. But I was wondering if anyone had any other words of wisdom here.
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moonagedaydream



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PostPosted: Wed Nov 02, 2011 2:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Question. The .01uF Disc caps (c4-c12) i ordered are huge. Would it be okay for me to just use the mylars? What kind of difference would it make if I did?

I'm such a noob.
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jumunius



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PostPosted: Wed Nov 02, 2011 3:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

moonagedaydream wrote:
Question. The .01uF Disc caps (c4-c12) i ordered are huge. Would it be okay for me to just use the mylars? What kind of difference would it make if I did?


These are decoupling caps. I believe mylar would work just as well here; people usually spec ceramics because they are more cost-effective. But if you have 8 mylar you can spare then it's probably worth the couple pennies of difference to just go for the mylar.
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