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 Forum index » DIY Hardware and Software » YuSynth
Yusynth Modules in Euro (12 Volt) Systems
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gdavis



Joined: Feb 27, 2013
Posts: 160
Location: San Diego

PostPosted: Wed Apr 09, 2014 1:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Anyone tried the VCO yet? I haven't seen anything so I'm taking a stab at it.

U1, U2 7xL15 -> 7xL12
R50 100k -> 70k (restores "5V" reference of saw core, pretty important)
R36, R51 12k -> 7.5k (restores full range of pulse width control)
R7 270k -> 216k (restores full range of coarse control).

For R7, 216k is the ideal value but might be difficult to find. Should be OK to just get as close as you can, i.e. 215k. It's just a coarse tune anyway.

You could adjust R6 for fine tune but I don't think it's really necessary, will just be less sensitive.

If you run out of adjustment on T1, R8 could be adjusted down a little but I don't think it would be much of a problem.


I haven't fully tested it, and forgot to do R7 so I don't have the full range, but otherwise it seems to be in the ballpark. I did it to a board that's just been lying around for quite a while and it cranked right up, only needing very slight trimming to get the wave shapes back. I just did a quick and sloppy check of V/oct and it was close enough that I think it will trim up no problem.

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Snaper



Joined: Feb 28, 2014
Posts: 65
Location: Hungary

PostPosted: Mon Oct 13, 2014 1:45 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm also interested about the VCO.
Basically built every module, what is able to fit behind a Euro panel :

- Steiner (dual)
- Arp 4072 (dual)
- VCA
- ADSR (oth versions, so dual module)
- VCA
- Wavefolder
- Noise (dual) + S&H
- VU driver from the out module

For me, 1v/oct tracking is not important, I like to use my VCO-s as "noise" sources, so if I can get some kind of tracking on 12 volts, it would be great.
...I mean, if I build it, would it produce sound? Very Happy
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gdavis



Joined: Feb 27, 2013
Posts: 160
Location: San Diego

PostPosted: Mon Oct 13, 2014 2:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

Well, here's a lame video of my Yusynth VCO with the mods I mentioned above controlled by a Turing Machine RLS all running at 12V. It definitely makes sound Laughing

https://www.youtube.com/watch?v=64MxQO5mMi4

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Snaper



Joined: Feb 28, 2014
Posts: 65
Location: Hungary

PostPosted: Fri Oct 17, 2014 11:25 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice, will etch 2 of them tomorrow...etched 2 Buchla 258 boards, L-1 design, no luck...no sound at all Sad

Silly question, I see, that all pots are 25k. My local shop has only 50k (smallest).
Can I use them?
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AlanP



Joined: Mar 11, 2014
Posts: 23
Location: New Zealand

PostPosted: Fri Oct 17, 2014 1:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sure can, just wire the closest you have to a 50k resistor across lugs 1 and 3 -- this will make the pot look like a 25k one (50k and 50k in parallel.) Response might be a little odd, but close enough for rock and roll.
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gdavis



Joined: Feb 27, 2013
Posts: 160
Location: San Diego

PostPosted: Fri Oct 17, 2014 7:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

50k pots will work. No need for 50k resistors in parallel. Make R36 and R51 15k (or close to it, not critical) to compensate the PWM range.
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Snaper



Joined: Feb 28, 2014
Posts: 65
Location: Hungary

PostPosted: Sat Oct 18, 2014 11:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you guys, but I think I will omit the whole PW-PWM and pulse out stuff, Im more like a "sinewave" guy Very Happy

So 50k would be good for freqs and FM ins Very Happy

Thanks!!!
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Snaper



Joined: Feb 28, 2014
Posts: 65
Location: Hungary

PostPosted: Wed Oct 22, 2014 1:24 am    Post subject: Reply with quote  Mark this post and the followings unread

Last question before build...
Im not so good at reading schematics, and there are no part names on the silkscreen for the pcb, just values.
Which are R50, R36, R51 and R7?
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Snaper



Joined: Feb 28, 2014
Posts: 65
Location: Hungary

PostPosted: Wed Oct 22, 2014 1:36 am    Post subject: Reply with quote  Mark this post and the followings unread

OK, just made the mods on the silkscreen. Its seems correct. Is it?


VCO-BC547-COMP-LAY1.gif
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VCO-BC547-COMP-LAY1.gif


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gdavis



Joined: Feb 27, 2013
Posts: 160
Location: San Diego

PostPosted: Wed Oct 22, 2014 11:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Snaper wrote:
OK, just made the mods on the silkscreen. Its seems correct. Is it?

Yup, you got it.

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Snaper



Joined: Feb 28, 2014
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Location: Hungary

PostPosted: Wed Oct 22, 2014 8:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks!!!
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