DS 7 clone

Uncle Krunkus · Posted: Wed May 31, 2006 2:04 am Post subject:

Okay Daniel,
looks like there's an Uncle Krunkus stripboard version of the DS7 happening tonight. Well, I've got about 25 spare LM13700s so it will be a dual DS7 stripboard. Something new might get me moving again. I've kinda been a bit stuck lately.

Uncle Krunkus · Posted: Wed May 31, 2006 5:16 am Post subject:

Hey Daniel,
have you got a component overlay for the dual DS7 w LM13700 PCB layout?
Sometimes it helps with getting the stripboard tight.
Thanks

dnny · Posted: Wed May 31, 2006 5:47 am Post subject:

Uncle Krunkus · Posted: Mon Jun 19, 2006 6:46 am Post subject:

Here's the stripboard layout. I've double checked it, but I haven't built it.

DS7.jpg

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Uncle Krunkus · Posted: Mon Jun 19, 2006 6:47 am Post subject:

And here's the copper side cutting guide.

DS7(CS).jpg

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dnny · Posted: Mon Jun 19, 2006 8:17 am Post subject:

looking good!
banana

You are the master of Loch Master.

thanks for doing this

zipzap · Posted: Mon Jun 19, 2006 11:20 am Post subject:

Hey, that´s some art! Enjoy doing that? Looks like a puzzle (to get from the circuit to that layout). And i think it´s built as quick as using a pcb!
And no cpu around Wink

What´s the thing labled ATE on the top left?

dnny · Posted: Mon Jun 19, 2006 11:28 am Post subject:

zipzap · Posted: Mon Jun 19, 2006 12:07 pm Post subject:

I see. Never noticed in the schematic that it´s run on 5v. Could be 12 or 15 just the same i guess.

Uncle Krunkus · Posted: Mon Jun 19, 2006 12:16 pm Post subject:

Yeah,
I wasn't sure why it's regulated down to 5V, but I just copied the schematic. Maybe you should try shorting it out and see what happens. I bet with a 9V battery and no regulator the envelope follower contaminates the VCO.

Uncle Krunkus · Posted: Mon Jun 19, 2006 12:22 pm Post subject:

BTW,
there are 35 wire links. I always do all the cuts first. Then the IC sockets, then the links, so that by the time you get to the components which look different from each other you have plenty of 'landmarks' to guide you.

zipzap · Posted: Mon Jun 19, 2006 12:22 pm Post subject:

why?
your second post was quick...
I mean why contaminate?

dnny · Posted: Mon Jun 19, 2006 12:27 pm Post subject:

dnny · Posted: Mon Jun 19, 2006 12:32 pm Post subject:

post are flying in like moskitoes Smile

the original DS-7 runs on 9V battery and the schematic is cloned from it, so there must be a reason why the original has the regulator and not just the battery.

Uncle Krunkus · Posted: Mon Jun 19, 2006 12:34 pm Post subject:

Because when C1 starts to charge you get a quick virtual short across the power which is probably too much for C20 to deal with by itself. It would only make the tone slide a bit (which it does anyway)
Well that's only a theory, you'd have to check it out with someone a bit more qualified than me to be sure. Maybe Jan or Stein.

Uncle Krunkus · Posted: Mon Jun 19, 2006 12:39 pm Post subject:

Yeah,
if it's designed for a 9V battery it makes sense to have the circuit set up for 5V, then you overshoot the regulator by 4V and you have a rock solid 5V rail. More reliable.

zipzap · Posted: Mon Jun 19, 2006 12:43 pm Post subject:

The differnt parts of the schematic look to me like stuff i find in my modular, running with 12v.
The thing about the short with c1 is interesting. guess you meen c2 can´t handle. But also cabs going to ground, charging and discharging can be found often, in envs, lfos mad many other.

you guys type too quick i can´t get this posted Smile

zipzap · Posted: Mon Jun 19, 2006 12:45 pm Post subject:

solid 5v from battery. Sounds very reasonable.

Uncle Krunkus · Posted: Mon Jun 19, 2006 1:27 pm Post subject:

It's strange that we don't go to the chat room in a situation like this. I guess the electro-music crowd just aren't much into chatting. I've been in there to see if anyone is around about a dozen times now and I've never found anyone!
BTW, No, I meant C1. I kept all the designators the same as the schematic and just made the 10uF power cap C20 for clarity. Otherwise it's the same as the PCB (which has a number of pins on the 324s different to the schem)

creekree · Posted: Mon Jun 19, 2006 1:30 pm Post subject:

he guys,

my ds7´s volume is too low, i really have to turn the gain on my mixer WAY UP in order to work with it. how to make the thing louder? i guess it is about changing a resistor value, but in all honesty i have no idea of where to start...

thanks, christian

Uncle Krunkus · Posted: Mon Jun 19, 2006 5:40 pm Post subject:

R33(10K), sits between C6 and one side of the volume pot. Try changing it down to 5K6.

creekree · Posted: Sun Jun 25, 2006 3:05 pm Post subject:

unkle krunkus,

i replaced the resistor, i soldered a second 10k parallel to the first one, i did what i could... the overall volume didnt improve that much.
anywhere else to look at?

creekree

Uncle Krunkus · Posted: Sun Jun 25, 2006 4:39 pm Post subject:

Are you sure you've got the volume pot connected properly? Try shorting the output straight to R33 (turn your amp down!)

dnny · Posted: Fri Jul 21, 2006 1:13 am Post subject:

i got a PM and i touhgt it would serve everybody better if it's posted here.

zipzap · Posted: Fri Jul 21, 2006 1:30 am Post subject:

Cool site! never been there before. lots of stuff to check out and a nice collection of schematics (Böhm Trickverzerrer! i like that stuff)