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 Forum index » DIY Hardware and Software
DS 7 clone
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nuclearsound



Joined: Jul 16, 2013
Posts: 15
Location: Nantes, France

PostPosted: Wed Aug 21, 2013 12:38 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Jumunius for your reply. But since I'm a beginner, what pins should I test on each IC ?

Another user asked for pictures, so find my hi-res pics if it's helpful :

http://dl.free.fr/b4A77O77q
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xpmtl



Joined: Aug 10, 2007
Posts: 158
Location: Brussels, Belgium

PostPosted: Wed Aug 21, 2013 3:35 am    Post subject: Reply with quote  Mark this post and the followings unread

For U1 : +5V at pin 7, GND at pin 4
For U2 : +5V at pin 4, GND at pin 11
For U3 : +5V at pin 4, GND at pin 11
For U4 : +5V at pin 7, GND at pin 4

Check that U100 (7805) is outputting +5V.

Which components are heating up?

Hum could be a bad ground connection.

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feggster



Joined: Sep 12, 2011
Posts: 50
Location: uk

PostPosted: Wed Aug 21, 2013 3:42 am    Post subject: Reply with quote  Mark this post and the followings unread

you missed the connection for trigger input, try a 47k-50k pot.


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nuclearsound



Joined: Jul 16, 2013
Posts: 15
Location: Nantes, France

PostPosted: Fri Aug 23, 2013 12:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Indeed, with that pot, it works... Confused The only thing now is that the output volume is reaaaaaaly low, even with the volume pot @ 100%. I plan to change R30 to a 330k or even 470k. But it seems so low that i can't imagine it could be enough. Just a quick question : are the pots current conductive ? Because I screwed them all on an iron plate on the back side.
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nuclearsound



Joined: Jul 16, 2013
Posts: 15
Location: Nantes, France

PostPosted: Mon Aug 26, 2013 12:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Now I have no more hum with the insulation of the bottom of the box. And battery does not heat anymore. I changed R30 to 470k, sound is a bit higher, but still tiny. Will try the measurements. thanks
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nuclearsound



Joined: Jul 16, 2013
Posts: 15
Location: Nantes, France

PostPosted: Mon Aug 26, 2013 1:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

One last thing, i didn't get by reading all pages of that topic, the use of C5. It says optional on my version of the bom, and I can't find its place on my PCB. Could it help to solder it somewhere ?
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jumunius



Joined: Apr 19, 2010
Posts: 346
Location: San Francisco, CA
Audio files: 13

PostPosted: Mon Aug 26, 2013 9:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi, I asked Marc Bareille about this when I built mine. He said, "this one is optional . Mount it if the noise filter ( color) op-amp self oscillate ..."

I don't think there's a place for it on the board, you would just solder it to each end of R35. It won't make your unit any louder, it would just clean up some noise affecting the opamp I guess.

For what it's worth, Marc was really responsive whenever I had questions to ask him, so if you get stuck and aren't finding what you need here you might ask him as well.

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nuclearsound



Joined: Jul 16, 2013
Posts: 15
Location: Nantes, France

PostPosted: Tue Aug 27, 2013 12:36 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Jumunius for your reply. For Marc, I doubt he would be of any help, since he didn't reply my last e-mail back in June when I asked for a final doublecheck on my BOM. Hopefully this community will replace that.
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jumunius



Joined: Apr 19, 2010
Posts: 346
Location: San Francisco, CA
Audio files: 13

PostPosted: Tue Aug 27, 2013 12:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

nuclearsound wrote:
Thanks Jumunius for your reply. For Marc, I doubt he would be of any help, since he didn't reply my last e-mail back in June when I asked for a final doublecheck on my BOM. Hopefully this community will replace that.


Ah, perhaps. Well, it's easy to let an email get beyond us now and again. I have gotten at least half a dozen replies from him over the years, so I wouldn't give up all hope. But if you're getting what you need here, all the better.

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nuclearsound



Joined: Jul 16, 2013
Posts: 15
Location: Nantes, France

PostPosted: Tue Aug 27, 2013 4:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

I just tested the UCs and all are fine. I also noticed since the beginning that the sound is mostly in the high frequencies range. I can obtain a low bass at the end of the VCO pot, but only an end, not in the middle. In other words, my DS-8 is more synth-ish than kick-ish. Don(t know if it can help to locate the problem.
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jumunius



Joined: Apr 19, 2010
Posts: 346
Location: San Francisco, CA
Audio files: 13

PostPosted: Tue Aug 27, 2013 10:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

nuclearsound wrote:
I just tested the UCs and all are fine. I also noticed since the beginning that the sound is mostly in the high frequencies range. I can obtain a low bass at the end of the VCO pot, but only an end, not in the middle. In other words, my DS-8 is more synth-ish than kick-ish. Don(t know if it can help to locate the problem.


Earlier in the thread you mentioned you'd installed all Linear pots. The VCO is spec'd as log. Maybe just switching to Lin would solve it -- having the wrong pot can mean your response curve is wrong, which could mean that your range is right but it is hard to dial in the right result at one end of the spectrum.

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ikihsek



Joined: Nov 27, 2013
Posts: 1
Location: Leeds

PostPosted: Wed Nov 27, 2013 9:36 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi all. New user here, found you guys after coming into some trouble with my DS7 clone, hope someone could help me out. I've built it the standard M.baraille way with a CA3080.

Basically there're drum synth sounds coming out but the Rate pot does nothing and the Mode pot is just acting as a pitch control. I noticed that the wiring for the Rate pot was reversed on the schematic from marcs site (R8 is connected to an outside lug AND wiper on the schem, but the hook-up diagram has the wiper+lug connection going into the LM324 and 47n cap). I swapped it to match the schematic and it worked! Fully funtional for about two day until it stopped during use, reverting back to the Rate pot problem. Tried swapping them back to the parts diagram way and still no Rate control.

I've thoroughly checked all the connections twice now, component to component rather than solder to solder so I'm pretty sure that's not a problem. Can't find any shorts. Have tried switching the LM324s which didn't change anything so I din't think theres anything wrong with them. Don't really know what to try next, any ideas?

The fact that it was fully funtional then just stopped is totally confusing me!
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new voodoo



Joined: May 06, 2013
Posts: 90
Location: RVA USA

PostPosted: Sat Nov 30, 2013 5:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

ikihsek wrote:

The fact that it was fully funtional then just stopped is totally confusing me!

Yea sounds confusing to me as well..all I can think of is some sort of overage?
Perhaps also chek yr caps for failure?
Also, if you dont have one, you could build an audio tracer thingy. (Dont know whathe technical name is) Its perhaps an Audio Probe? Basically its just a audio wire with a connection you either can connect to an amp (3.5mm or 1/4") on one end (or a speaker, amp, etc) and a wire for connectn to ground and a probe wire with a clip or whatever with a capacitor soldered into the circ. Super simple, should take u maybe ten minutes to make and yuo can use it to trace audio being made at any point in the circuit by touching the wire clamp-y end thinagamajigger to a point anywhere on the lines and dots in a PCB. (sorry not really up on terminology)

hope that helps?

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jumunius



Joined: Apr 19, 2010
Posts: 346
Location: San Francisco, CA
Audio files: 13

PostPosted: Sun Dec 01, 2013 11:31 am    Post subject: Reply with quote  Mark this post and the followings unread

ikihsek wrote:
I noticed that the wiring for the Rate pot was reversed on the schematic from marcs site (R8 is connected to an outside lug AND wiper on the schem, but the hook-up diagram has the wiper+lug connection going into the LM324 and 47n cap).


Hi, I don't have any great advice except to say that this pot can be wired either way. It's a variable resistor. The wiper could link to either lug and it shouldn't have the effect of making the rate pot work or not. So the fact that the LFO started working for you after you did this is a red herring.

More likely, when you went to mess around with the wiring, you jostled something so that suddenly it was making a connection, and then eventually the connection failed again. I think you've said you already checked continuity from component to component. I assume this includes all the wiring as well. I'd try that again, especially for the rate and mode pots, and maybe jostle the wiring gently while you do it to see if it makes the continuity cut in and out especially on any connection.

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sneakthief



Joined: Jul 24, 2006
Posts: 525
Location: Berlin

PostPosted: Sun Feb 16, 2014 1:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

For anyone that wants to convert a Coron DS7 to a DS8, I filled in the components overlay that was posted in this thread a long time ago:

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

(The 10K listed in bold italic was already stuffed on my DS7 board)

You have to remove the second foot-switch jack on the top next to the intensity pot and put in the "VCO/Noise Balance" pot.

You also need to drill 2 holes for the 2 new On-Off-On switches.

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burtondelfuturo



Joined: Jun 10, 2013
Posts: 4
Location: Buenos aires

PostPosted: Wed Mar 05, 2014 2:11 pm    Post subject: trouble
Subject description: it doesn´t sound good
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hi,
I finised a double coron but it doesn´t sound good, it sound very loud, when a move any pot it sound both chanels and the trigger do not work.
i think it is a trouble with the wiring, because i was extremely careful with the pcb.

All the ground to a single point, the jacks too
I use a guitar amplifier
I use external 9v, negative ground

can someone help my?
thanks
there are two pictures of the divice

thank
Martin


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burtondelfuturo



Joined: Jun 10, 2013
Posts: 4
Location: Buenos aires

PostPosted: Wed Mar 05, 2014 2:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

the front of the machine...


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jumunius



Joined: Apr 19, 2010
Posts: 346
Location: San Francisco, CA
Audio files: 13

PostPosted: Wed Mar 05, 2014 3:21 pm    Post subject: Re: trouble
Subject description: it doesn´t sound good
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burtondelfuturo wrote:
hi,
All the ground to a single point, the jacks too
I use external 9v, negative ground


Are you actually wiring your grounds? It looks to me like some of your ground wires aren't even connected (for example, I see unconnected ground lugs of some pots and jacks). You need to solder every ground wire to ensure that everything is properly grounded.

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burtondelfuturo



Joined: Jun 10, 2013
Posts: 4
Location: Buenos aires

PostPosted: Mon Mar 10, 2014 5:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

jumunius:
Thanks for your reply, the grounds are wiring with the metalic case, I will check it with the tester anyway.
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