DS 7 clone

Jumawa99 · Posted: Fri Mar 29, 2013 2:46 am Post subject:

Hello All,,

I am new here..
My first project is to build this DS 7 / DS 8 clone,,
so, the first attempt is to build the one based on XPMTL / AK47 Design..

i populate the pcb based on the xpmtl instruction, except, i couldn't find the 10M resistor, so i change it to 1 M..
and i couldn't find the logarithmic pot, so i use linear for all pot, and i couldn't find the 2m2 pot, so i used 1M pot instead..

I am not sure if my DS clone working good or bad, or none of them..
but, the VCO knob is not working, i mean, there are no change on the sound whenever i play with it..and also the sweep knob, and the Mode knob..,have no idea what is happening down there..need help..

and yeah, i put the sound samples,,

please check it out..

So, maybe if someone know what is going on with my DS Clone..please advice me to advance to the next level..

cheers..

DS8 Clone.mp3

Description:

This is the sound samples of my DS 8 clone, based on XPMTL / AK-47 Design. It sound really glitchy,, and the VCO knob is not given any effect, also the Sweep knob, and the rate knob sounds weird..

Download

Filename:

DS8 Clone.mp3

Filesize:

5.2 MB

Downloaded:

23 Time(s)

JeanFé · Joined: Feb 03, 2013 Posts: 3 Location: France

sounds like IC2 is not doing the job, you may want to probe the signal to find if any faulty components : http://www.diystompboxes.com/pedals/debug.html

lots of wires and weird jumpers in this circuit; if space is not an issue i'd etch the bareille design which looks smarter to me! some nice glitches tho, with a decent amp and a bit of eq it could sound much more interesting than fully working unit (consider sampling before debbuging lol)

xpmtl · Joined: Aug 10, 2007 Posts: 122 Location: Brussels, Belgium

Nope, shouldn't sound like that. Your VCO doesn't work. 10M resistor and 2M2 pot aren't for the vco part so it's not the problem. Check the LM324 and trace signal.

i've posted a schematic of the circuit on page 13 I think, use that to debug.

And try to find a 10M resistor..

the 1M pot is fine if you don't find the 2m2.

x.

Jumawa99 · Posted: Sat Mar 30, 2013 2:25 am Post subject:

Hello Jeanfe

Thanks for the debugging link,,
but i still didn't understand it..(lol to myself)..i am a very newbie user of DIY electronic thingy..and since i have no experience on how to debugging plus i have no reference to what is the working ds clone sounds like, or looks like..so i have no comparison to what i want to debug..i know that the VCO and the sweep is not working..so it must be the IC2 the problem..

and yeah, i'll keep that one,,and make a new one..
would like to try the bareille design,,but i couldn't find one..

hey xptml..
i know it's not your design fault..clearly..
so, i make a new pcb,,and populated it with a new component..
but still the vco is not working..
but the sound is changing,,(compared to the first one)

what is it?? i start to be superstitious about it,,maybe some goat in the shell,,or my hand get a lot of static so it damage the ic and so on..

or maybe the components is broken? (caps, resistor, pots,etc)..
i got the components from the local store though...

i use some 1/4 watt resistors and some 1/2 watt resistors.., and some 50v and some 16v rate elco caps..

and yeah, another samples..

please tell me the simplest way how to debugging this circuit..

thanks

ds8 clone2.mp3

Description:

here is the second attempt of my ds clone based on xptml / ak47 design..

Download

Filename:

ds8 clone2.mp3

Filesize:

4.74 MB

Downloaded:

22 Time(s)

JeanFé · Joined: Feb 03, 2013 Posts: 3 Location: France

Check if any signal at pins 1,7,8 & 14 (on corners) of the LM324 with an audio probe as described in the link. If so, track it until errors with the help of xptml schematic ; could be cold joints, reversed or damaged elements.

You could make your day easier by: splitting the pcb and board-mounting your pots (or just using pcb connectors) / removing the footswitch as it's known to be useless / simplifying ground loop by outboard daisychaining pots & switches & all.

Xptml did a great cloning job, but Coron original package is sooo small! I breadboarded this circuit but ended up etchin a ds7 as the noise circuit was rather disappointing. Added with some nasty PT2399 delay is instant dub madness Smile

xpmtl · Joined: Aug 10, 2007 Posts: 122 Location: Brussels, Belgium

Sounds more like it now but do the sweep or vco pots do anything? The high pitched sound is odd, check your capacitors values and pots wiring.

It's pretty hard to debug a circuit like that and i'm afraid i can't offer much help.

If you can, post a high res picture of your board, maybe I could spot something.

x.

feggster · Joined: Sep 12, 2011 Posts: 24 Location: uk

I built the ak47 and got it working, but was not happy with the noise section..I'm guessing I need to try different transistor/s?
transistor q3 is confusing on the ak47 layout as it is shown as E-C-B (same as the original transistors = 2sc536) not E-B-C like bc547 shown in the BOM.