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 Forum index » DIY Hardware and Software
ARP Odyssey Oscillators
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isak



Joined: Dec 13, 2009
Posts: 703
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PostPosted: Sat Jan 11, 2014 2:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi xpmtl

i used regular Fairchild ones, 2N3904/06, didnt matched them at all.
if it helps i put them together with thermal grease.

maybe my test is not so clear, i'll explain better.
i have the lite ,midi2cv, it gots only 5 octaves.
http://www.acxsynth.com/midi2cvlite/midi2cvlitefr.htm
when i change the Tune of the ody VCO, to high i got a great scale track up to 9 oct Smile
meaning...say i play C1 it will be perfect up to C5, then i cant get any higher cause the midi2cv lite wont let me, then... changing the Ody VCO Tune so what was C1 now will be C5 then i get perfect scale for higher notes up to 9 or even more Smile
i hope i explain this better now.

cheers,
Isak E.

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xpmtl



Joined: Aug 10, 2007
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PostPosted: Sun Jan 12, 2014 5:25 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Isak,

I've soldered thru-hole trannies on the original smd pads (not easy) and now i get 8 octaves perfectly in tune. 9th octave is a tiny bit off.

Used 3904/3906 as you did.

Thanks for your input!

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isak



Joined: Dec 13, 2009
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PostPosted: Sun Jan 12, 2014 6:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Happy to hear you got it to work, enjoy this amazing vco Wink
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pdman1



Joined: Mar 28, 2007
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PostPosted: Tue Mar 11, 2014 6:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

Been off these forums for a while. Does anyone sell already etched PCB's for this Arp VCO?

Thanks
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isak



Joined: Dec 13, 2009
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PostPosted: Wed Mar 12, 2014 12:24 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi, I pm'd you.

cheers.

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xpmtl



Joined: Aug 10, 2007
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PostPosted: Fri Mar 14, 2014 1:02 am    Post subject: Reply with quote  Mark this post and the followings unread

pdman1 wrote:
Been off these forums for a while. Does anyone sell already etched PCB's for this Arp VCO?

Thanks


I'll have dual VCOs + ringmod PCBs to sell in MOTM and EURO format really soon, will be SMD tho.

Just need to order an new prototype to validate some changes.

Check my sig for more info (in projects section).

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steffensen



Joined: Jul 11, 2012
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PostPosted: Fri Mar 14, 2014 1:42 am    Post subject: Reply with quote  Mark this post and the followings unread

xpmtl wrote:

I'll have dual VCOs + ringmod PCBs to sell in MOTM and EURO format really soon, will be SMD tho.

Just need to order an new prototype to validate some changes.

Check my sig for more info (in projects section).


SMD - interesting. How did you solve the issue with matching of the BJT's and possible JFET's i wonder?
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xpmtl



Joined: Aug 10, 2007
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PostPosted: Fri Mar 14, 2014 3:07 am    Post subject: Reply with quote  Mark this post and the followings unread

I didn't Very Happy

Results are pitiful with smd transistors for the expo pair but quite good with thru-hole 2N3904/3906. I had matched a series of transistors so i used a pair with the same values and epoxied them together. So it's not a matched pair per say but it should be really close. I get 8 octaves of usable tracking, 9th octave is a bit off but stll usable.

I've ordered some matched pairs in sot-323 format (BC846bpn & mmdt3946) to test, If it doesn't work i'll stick with the thru-hole pair.

Don't think the fets need to be matched.

I read somewhere that the expo pairs in the oddy weren't matched, so....

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steffensen



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PostPosted: Fri Mar 14, 2014 3:14 am    Post subject: Reply with quote  Mark this post and the followings unread

xpmtl wrote:
I didn't Very Happy

Results are pitiful with smd transistors for the expo pair but quite good with thru-hole 2N3904/3906. I had matched a series of transistors so i used a pair with the same values and epoxied them together. So it's not a matched pair per say but it should be really close. I get 8 octaves of usable tracking, 9th octave is a bit off but stll usable.

I've ordered some matched pairs in sot-323 format (BC846bpn & mmdt3946) to test, If it doesn't work i'll stick with the thru-hole pair.

Don't think the fets need to be matched.

I read somewhere that the expo pairs in the oddy weren't matched, so....


Thought so.. been looking for a alternative myself, to match SMD BJT's & JFET's.

I would be highly interested on how you find the matched SOT-23's to work, please let me know once you have tried them. Smile

Yea, matching isn't essential for the tracking imo. It's enough if you use the ones from the same tape. (when it comes to TH anyway)
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xpmtl



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PostPosted: Fri Mar 14, 2014 4:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Well matching is for temperature stability so it won't affect tracking anyways, what i look for is having the two but in one package possibly on the same die (i doubt they will).

BTW why do you think the FETs should be matched?

I'll keep you inform of the results.

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steffensen



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PostPosted: Fri Mar 14, 2014 8:18 am    Post subject: Reply with quote  Mark this post and the followings unread

xpmtl wrote:
Well matching is for temperature stability so it won't affect tracking anyways, what i look for is having the two but in one package possibly on the same die (i doubt they will).

BTW why do you think the FETs should be matched?

I'll keep you inform of the results.


Yes, sorry, i meant drifting not tracking.
Regarding FET's, I'm just going by own experience here regarding another kind of related VCO. Wink
Would be nice if there was a SMD option, thats all.

Anyhow, looking forward to your results!
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patroche



Joined: Feb 26, 2012
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PostPosted: Wed May 07, 2014 2:23 am    Post subject: Reply with quote  Mark this post and the followings unread

So i have just cloned it

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

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isak



Joined: Dec 13, 2009
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PostPosted: Wed May 07, 2014 2:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice job my friend, well done!
Any vid clip to see the beast in action?

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Sebo



Joined: Apr 27, 2007
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PostPosted: Wed May 07, 2014 3:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

Great Job!!!
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My Music:
www.cosaquitosenglobo.com.ar
www.myspace.com/cosaquitosenglobo
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patroche



Joined: Feb 26, 2012
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PostPosted: Thu May 08, 2014 12:29 am    Post subject: Reply with quote  Mark this post and the followings unread

A view from the inside

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

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isak



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PostPosted: Thu May 08, 2014 1:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice work!
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patroche



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PostPosted: Thu May 08, 2014 5:17 am    Post subject: Reply with quote  Mark this post and the followings unread

you can find all schématics and PCB at http://www.crazy-patroche.com/article-clonage-du-arp-odyssey-2800-mk1-123562495.html
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isak



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PostPosted: Thu May 08, 2014 6:18 am    Post subject: Reply with quote  Mark this post and the followings unread

oh man, such a beauty work you did over there Smile
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patroche



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PostPosted: Thu May 08, 2014 2:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
Any vid clip to see the beast in action?

https://www.youtube.com/watch?v=hl6Mit7GdpE&feature=youtu.be

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Zodiak



Joined: May 20, 2007
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Location: Gillingham, Kent UK

PostPosted: Thu May 08, 2014 3:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

Nice job, that must have taken ages, you must be proud Very Happy
Whats next a MiniMoog? Razz
PS Where did you get the slider and switch caps from?

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patroche



Joined: Feb 26, 2012
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PostPosted: Thu May 08, 2014 11:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

The next is the seq ARP 1601
For the sliders you can got its here
http://www.synthpatchers.com/product-category/arp/arp-odyssey-mk-i-2800/

For colored caps
http://www.smallbearelec.com/servlet/Detail?no=44

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isak



Joined: Dec 13, 2009
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PostPosted: Thu May 08, 2014 11:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the links!
Where did you get the big pcb's boards from?

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patroche



Joined: Feb 26, 2012
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PostPosted: Fri May 09, 2014 1:19 am    Post subject: Reply with quote  Mark this post and the followings unread

here are big PCB
http://www.tme.eu/fr/katalog/?idp=1&search=laminate&cleanParameters=1

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Sebo



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PostPosted: Fri May 09, 2014 10:03 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for sharing patroche!!!
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Zodiak



Joined: May 20, 2007
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PostPosted: Sat May 10, 2014 1:36 pm    Post subject:   Reply with quote  Mark this post and the followings unread

Thanks for the pointer to the caps, I have been looking for them at a reasonable price for ages.
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