DS 7 clone

Uncle Krunkus · Posted: Sun Dec 03, 2006 7:46 am Post subject:

What's the worst that could happen? Blood sprayed all over the room. Deregistration? I don't know. I'm only a doctor. A drum doctor it's true, but still only a doctor. If I knew everything then it would be impossible for anyone to sue me for malpractice! Insurance premiums would plummet! I wouldn't be able to justify the outrageous fees that I charge! Rolling Eyes

Actually, speaking of fees, is your account current? I'll put your invoice in the mail tomorrow! Very Happy

PS Short answer: - Not sure. Embarassed

Pehr · Posted: Sun Dec 03, 2006 8:37 am Post subject:

Pehr · Posted: Wed Dec 20, 2006 6:25 am Post subject:

Hi!

Here's a PCB layout for the DS8 if anyone needs it. It's for the CA3080 though.

dnny · Posted: Wed Dec 20, 2006 7:00 am Post subject:

Thanks Pehr.

do you have the parts layout too?

Pehr · Posted: Wed Jan 03, 2007 4:07 am Post subject:

Pehr · Posted: Thu Jan 11, 2007 5:40 am Post subject:

dnny · Posted: Thu Jan 11, 2007 8:33 am Post subject:

thanks pehr.

i didn't know i was so blind that i haven't seen that discointellect had all ready posted that - sorry cyclops

Pehr · Posted: Thu Jan 11, 2007 11:03 pm Post subject:

Pehr · Posted: Thu Jan 11, 2007 11:12 pm Post subject:

goodrevdoc · Posted: Sat Jan 13, 2007 11:40 pm Post subject:

Alright, i've gone and done it now. Finally got two out of four finished, with parts on the way for the other half!

Also managed to kludge the board a bit for PCB mounted pots. I have a pdf of the layout if anyone's interested. Here's a pic of the twins:

Pehr · Posted: Sun Jan 14, 2007 1:11 am Post subject:

goodrevdoc · Posted: Mon Jan 15, 2007 1:05 am Post subject:

Here ya go Pehr!!!
-justin

Pehr · Posted: Mon Jan 15, 2007 4:11 am Post subject:

Thanks!

Pehr · Posted: Sat Feb 03, 2007 12:16 pm Post subject:

Another question:

On the DS8-schematic there is a resistor (R31) with value "NC". Does it mean "no connection" or should I just use the same value as i the DS7 (220k)? Confused

goodrevdoc · Posted: Sat Feb 03, 2007 9:06 pm Post subject:

Generally that means not connected, so as just a guess, i would leave it out. the worst that can happen is that it wont work.
-justin

Pehr · Posted: Sat Feb 03, 2007 11:08 pm Post subject:

Pehr · Posted: Sun Feb 04, 2007 12:24 am Post subject:

Yet another question:

How is the envelope generator affected if I would use 4.7uF caps instead of 3.3uF?

My guess it would just make the decay time a little bit longer, right?

goodrevdoc · Posted: Sun Feb 04, 2007 2:07 pm Post subject:

Yeah, probably just a bit longer, but would it also raise the minimum decay time? Nah, it looks like that's set by R3. Also the other cap is for the sweep control, so changing it wouldn't affect the decay.
-justin

Pehr · Posted: Sun Feb 04, 2007 2:24 pm Post subject:

Thanks again! Very Happy

scorpiistar · Joined: Feb 28, 2007 Posts: 9 Location: australia

hi....im new....i just completed the DS7 on a breadboard, and am ready for testing! seems you can pull C2 3u3/sweep and it makes no audible difference ........i think tomorrow ill try the attack decay mod.....any requests?!

Sonarbase

6079smith · Posted: Tue Mar 27, 2007 6:44 pm Post subject:

Hi, just a few comments and whatever...
a decoupling cap (or two) is a good idea. I had a horrible highpitched squeal going on that a 100nF cap across the power rails got rid of.
I don't know what power supply others are using but I'm using 15 volts... and that regulator gets hot. Painful hot. Heatsink is also a good idea. I made one out of a tin can; works fine.
anyone sort out the volume problem? Is it because a 5volt module just can't put out the same levels as ones using +/-15? I have the same problem with the wasp filter. Anyone point me towards a transistor amplifier?
I'll give some of the different mods a go tomorrow, see if there's anything else to add... and thanks to all involved for this module.
Andrew.

richardc64 · Posted: Wed Mar 28, 2007 7:46 am Post subject:

6079smith · Posted: Wed Mar 28, 2007 10:56 am Post subject:

Thanks for the response... I've actually tried both of these. Even raised the feedback resistor to 10M(!) with no real difference. Oh well, back to the drawing board...

Sonarbase · Posted: Wed Mar 28, 2007 11:18 am Post subject: