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Yamaha CS-15 Filter CV In Jack?
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celebutante



Joined: Jun 29, 2007
Posts: 36
Location: Los Angeles

PostPosted: Mon Mar 04, 2019 7:03 pm    Post subject: Yamaha CS-15 Filter CV In Jack? Reply with quote  Mark this post and the followings unread

Hey all, I've scoured the internet trying to find info on adding a filter CV jack (or separate ones for each VCF), but I can't find anything. I managed to find a PDF of the Don Solaris mods hiding in the Internet Wayback Machine, but no info on adding filter CV there.

Has anyone done this mod? I assume it'd be relatively easy, but I'm not the best schematic reader.

Thanks in advance.
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ringroad



Joined: Feb 28, 2012
Posts: 38
Location: Coventry, UK
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PostPosted: Thu Mar 07, 2019 12:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

Caveat - haven't done it on mine - but I reckon that sending a 0-10V CV signal through a ~39K resistor to the point where everything else joins together before the diode on the way into Vf (pin 4?) on the IG00156 would do it.

I fret about it because the filter chips are going to be next-to-impossible to replace if I did fry them. Might want to just buffer and limit the CV input.

It should be do-able to figure out some cunning switching arrangement to optionally control both filters separately.
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celebutante



Joined: Jun 29, 2007
Posts: 36
Location: Los Angeles

PostPosted: Tue Mar 12, 2019 2:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Great, thank you.
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wackelpeter



Joined: May 05, 2013
Posts: 453
Location: germany
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PostPosted: Thu Mar 14, 2019 2:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Themenbereich Habich Modedesigner my cs15. But i'm St work right now, GEZ back later when@ Home.


Auto correction:)

I Wrote i modded my cs15 And Not that i am a Modedesigner. Lol

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wackelpeter



Joined: May 05, 2013
Posts: 453
Location: germany
Audio files: 10

PostPosted: Fri Mar 15, 2019 9:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Well got back from work… already did yesterday, but forgot to Reply...

After digging out the case buried deep under several tons of electronic trash and other stuff, i can tell you that i did at least those three mods: the LFO rate mod, something with ext.(Signal???)/noise Routing... guess that's switching between ext.Signal and int.noise source and at least separate CV Inputs for both VCFs, separately switchable and linking of external CV... don't know actually what this was, i had to read it up again… didn't used the CS-15 for years now and haven't saved the docs or anything else i made…

summary i have 3 additional Input/Output (2xVCF CV in + 1LFO out???)
and 5 switches added

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