DS 7 clone

dnny · Last edited by dnny on Thu Dec 08, 2005 12:44 am; edited 3 times in total

Have you build the DS7-clone ?

well i did and its great.

mosc · Posted: Fri May 13, 2005 6:44 am Post subject:

Cool. Do you have any pictures and mp3 sound examples?

dnny · Posted: Thu Jun 16, 2005 4:34 am Post subject:

finally i got it in a decent case...

so here are some pic´s of my Dual DS7 clones - -
just need to ad labels to knobs

sound samples are soon here also

daniel

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dnny · Posted: Thu Jun 16, 2005 8:42 am Post subject:

Hi

here it is finally : sound sample of my DS7 triggered just whit finger on piezo.

its just one DS7

i will post soon some new samples of two DS7 and noisegenerator
just need to learn how to record whit my PC -

sorry about the quality of this .mp3

daniel

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mosc · Posted: Thu Jun 16, 2005 11:23 am Post subject:

Daniel, looks and sounds great. Congratulations. I'm sure you'll have many hours of fun playing with these toys.

If you want a good program for recording stuff on your PC that is free, be sure to check out Audacity. Please keep us posted with more mp3s and pictures. Smile

dnny · Posted: Tue Jun 28, 2005 4:00 am Post subject: DS7 mods

so here are some pics of DS7 mods

first there is the VCA input mod. (for signal not for CV)
run wire from jack to leg 3 of CA3080 via 100K resistor and 100K pot.
to the panel you ad VCA input (jack) and VCA input level (pot)

and second comes the manual trigger mod:
run wire from +9V via 1M resistor to momentary push button and from there to trigger sens pot point 3.
to the panel you ad momentary push button.

(you get continuos signal if you hold the button down.)

daniel

ps. the RJWsofts Schematic Publisher is great and the pics are made whit it.
Schematic Publisher free download

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Wild Zebra · Posted: Tue Jun 28, 2005 7:26 am Post subject:

Cool thanks dnny. Can't wait to dig into those ds7's

discointellect · Joined: Jan 08, 2006 Posts: 8 Location: UK

I was looking at building a couple of the DS-7s but I can't find the CA3080 anywhere (I think it's been discontinued) - anyone know where I might be able to source one (in the UK) or of an equivalent chip that could be used?
Thanks.

Macaba · Joined: Jul 13, 2005 Posts: 160 Location: UK

The chip that everyone knows about is the LM13700, which does the same thing, EXCEPT that its in a package twice as big, because it has two transconductance amplifiers on the same chip (twice the value!). So there is a replacement, but its rather impratical to get it on the board. Upon reading the datasheet, I notice at the top it says that there is NO recommended replacement. Outta luck?

discointellect · Joined: Jan 08, 2006 Posts: 8 Location: UK

Ta, bit of a pain that it won't fit the PCB but I'm planning on building a pair of them so I expect I can hack something together (flying leads to a bit of stripboard or something equally professional looking). I'm a complete novice at this electronics lark, so today I learn the no doubt valuable lesson of "make sure all the necessary components are available before you order the PCB" Wink

dnny · Posted: Sun Jan 08, 2006 7:06 am Post subject:

discointellect · Joined: Jan 08, 2006 Posts: 8 Location: UK

Cheers for the help - got my first one up and running with the LM13700; I've got a second DS7 PCB so I'll wire that in to the other half. Really cool little device and nice and simple to put together - I'm planning on getting a pair of DS8 boards as well and casing the whole lot up to act as a 4 channel percussion synth to be sequenced by my Regelwerk. Should be fun Wink

dnny · Posted: Sun Apr 09, 2006 2:25 am Post subject:

since the CA3080 (2MHz, Operational Transconductance Amplifier) is coming more hard to find. i made some adjustments to the PCB so you can use one LM13700 or LM17600 and have two DS7 run whit that one chip.

here it comes :
Posted Image, might have been reduced in size. Click Image to view fullscreen.

and here is the layout whit tree jumper wires:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

when you want a hi-resolution image of the PCB just email me and i will be glad to post it to you

HTH
daniel

Pehr · Posted: Wed Apr 26, 2006 10:45 am Post subject:

Trimlog has lots of CA3080E here, I've ordered a few from there. Trimlog is probably gonna close or they are going to sell it, I dunno... I do know that they have a sale Very Happy

dnny · Posted: Wed Apr 26, 2006 10:37 pm Post subject:

nice.
thanks Pehr for this tip.

i just got twenty LM13600´s from ELFA, so i think i will be fine whit those for a while. but for others this is great news.

Pehr · Posted: Fri Apr 28, 2006 1:44 pm Post subject:

Jim Patchell has CA3280 for sale at the Patch Hell Website and AD633 too Cool

Wild Zebra · Posted: Mon May 08, 2006 7:44 am Post subject:

Thanks dnny,
Although I have seen CA3080, It's nice to see a new design and using only one chip. Who doensn't need a couple of extra LM13700's laying around, Guess it's time I order up. I still need to make those DS7's.
You sent those files many moons ago.

creekree · Posted: Mon May 29, 2006 12:33 pm Post subject:

hi all,

been lurking here for quite some time now, and if i am not mistaken, this is my first post, so hello!

dnny kindly sent me the pcb layout for the ds7-clone, which i now have finished. alas... it is not working. actually, i made some kind of kraakdoos, since i do get strange noises by putting my finger on various spots of the pcb. however, i´d like to trigger it with my 606. maybe with the 707. whatever - i want it to work the way it is intended to work.

my question: i didnt have two specific components at hand, so i substituted C6, a .1uF electrolytic, with a .1uF tantalum cap.
also i used a ceramic 1n cap for C5.
could this be the problem?
i do not know that much about caps to answer those questions myself, so maybe someone here could enlighten me?
oh, the voltages on the ICs are correct, and the pcb i made looks quite good too - so i´d like to exclude the possibility of shortcuts.

thank you, creekree

toppobrillo · Posted: Mon May 29, 2006 1:05 pm Post subject:

hey creekree, welcome to the forum...

so first off, C6 in the schematic is actually a 1uF... it's just a decoupling cap [eliminating a DC bias] and .1 would work here too, but like this, the cap is a high pass filter and you would get less low frequency signal at the output. if you use a polarized cap, make sure it is oriented properly.

ok, and C5 in the schematic is actually supposed to be 100nF [.1 uF], i suspect this to be your problem, as a smaller cap in this position like 1nF [.001uf] would make very high frequency oscillations with very small amplitude.

replace this cap with a .1uF ceramic, mylar, whatever.. if you use a polarized, make sure it is negative end to ground.

anyways, good luck, hope this is the fix..

josh

creekree · Posted: Tue May 30, 2006 7:38 am Post subject:

topp,

youre the man!
your suggestions about the capacitor values were right - i didnt notice since i just collected the parts according to the BOM and then stuffed the PCB.
the BOM is not correct on those caps.
also, and that was the tricky part, the BC550 i used was broken. i guess that is the price you have to pay when you salvage parts from broken electronic devices - they´re not broken for no reason, eh?

anyway, thanks for the help. my ds7 is working just fine now! - time to look into adding a noise source.

creekree

toppobrillo · Posted: Tue May 30, 2006 8:17 am Post subject:

cool glad it works!

dnny · Posted: Tue May 30, 2006 1:01 pm Post subject:

creekree -
glad to hear that it works - now:)
and doesn't it sound great for such a small and easy to build device?
i think everyone should make at least one of these.

creekree · Posted: Tue May 30, 2006 2:30 pm Post subject:

yeah dnny youre right - nice toy indeed, it does go very well with my modded 606.
it is easy to build, i spent one lazy rainy day on etching, stuffing the pcb and building a case - all in all maybe 3 hours? if it hadnt been for my problems, that is... (dang 550, who would´ve thought...)
i added a switch to toggle between 100 and 560 on R11 as the "bass boost" sometimes goes undesirably too low (speak: speaker-blowing) for my taste.
how does the VCA input behave? is it just an audio gate or does it filter the signal? havnt tried it yet but will someday (i have plenty of jacks lying around - people! salvage junk! harvest parts! save money!)

thanks to monsieur bareille for cloning the thing and publishing schematics!
... also thanks to you, dnny, for the directions of how to add a trigger button.

as a sidenote: my girlfriend immediately fell in love with the ds7. she is a huge kraakdoos (cracklebox) fan (probably one of the best gift EVER that i gave her) and we would jam for like one hour with the 606, x0xb0x and her tweaking the hell out of the ds7 running through a delay. now she wants the noise source implemented - "hey, can you put more knobs on this thing that i can turn?!?" oddly enough, she does not want to learn to operate the x0x... sigh, girls......

Uncle Krunkus · Posted: Tue May 30, 2006 2:47 pm Post subject:

Hey Creekree,
be thankful your girlfriend is interested in electronic music at all!! Laughing

I'm thinking I might have a go at one of these DS7s myself!!

dnny · Posted: Tue May 30, 2006 10:18 pm Post subject: