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 Forum index » DIY Hardware and Software » fonik's place
Voltage Controlled OpAmp RingMod (Modulator)
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jumunius



Joined: Apr 19, 2010
Posts: 346
Location: San Francisco, CA
Audio files: 13

PostPosted: Tue Mar 08, 2011 2:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

Are the trimpots best as multi-turn or single? I don't see it specified, but the graphics on the PCB look like multi-turn. (Unfortunately the single turn trimpots I ordered face into other components making them pretty useless!)

(I have the same question about the PS3100 which I received today thanks very much!)

Thanks!
Jim
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fonik



Joined: Jun 07, 2006
Posts: 3721
Location: Germany
Audio files: 23

PostPosted: Tue Mar 08, 2011 2:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

jumunius wrote:
Are the trimpots best as multi-turn or single? I don't see it specified, but the graphics on the PCB look like multi-turn. (Unfortunately the single turn trimpots I ordered face into other components making them pretty useless!)

it is meant to be multiturn, however for my SMT version i used single turn, which works well, too. you just need a calm hand Very Happy

Quote:
(I have the same question about the PS3100 which I received today thanks very much!)

see above. and the trims on the PS3100 are not critical anyways (IMHO)

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cheers,
matthias
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jumunius



Joined: Apr 19, 2010
Posts: 346
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Audio files: 13

PostPosted: Tue Mar 08, 2011 2:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ok, thanks. Good to know.
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wmonk



Joined: Sep 15, 2008
Posts: 485
Location: Enschede, the Netherlands
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PostPosted: Sun Aug 14, 2011 6:11 am    Post subject: Reply with quote  Mark this post and the followings unread

Finished one last week. I absolutely love it! Very Happy
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Sounds will follow Smile
Cheers,
Woody

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fonik



Joined: Jun 07, 2006
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Location: Germany
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PostPosted: Mon Aug 15, 2011 3:40 am    Post subject: Reply with quote  Mark this post and the followings unread

wmonk wrote:
Finished one last week. I absolutely love it! Very Happy

Sounds will follow

your wooden panels look awesome, woody.
i am looking forward to hear it!

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fonik



Joined: Jun 07, 2006
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PostPosted: Mon Oct 24, 2011 2:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

BTW this module will be available as professional built/assembled complete eurorack module soon:

fonitronik mh31

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jumunius



Joined: Apr 19, 2010
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Audio files: 13

PostPosted: Sat Dec 10, 2011 12:59 pm    Post subject: Re: Powered up the VC RingMod last night Reply with quote  Mark this post and the followings unread

fonik wrote:
kkissinger wrote:
Both VCA's work ok. The Carrier signal is ok. The Modulator signal is clipped though ... so, I have some troubleshooting to do.

does it clip at the testpiont TP2, or does it clip at the output? latter would be the feature, not a bug.


Hi, I'm finally getting around to trying out this module more thoroughly and I'm having problems including the fact that it seems a little TOO distorted. If I use a triangle wave into either the mod or carrier, the waveform at the related test points looks a little sinusoidal. Not completely, just like a triangle with more curve. What could be causing this?

(Adjusting the trimmers seems to affect the waveform but the result never seems to be a proper triangle.... and anyways, I assume the trimmers are merely supposed to adjust DC offset, no?)

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fonik



Joined: Jun 07, 2006
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PostPosted: Sat Dec 10, 2011 2:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

you never will get out what you put in Twisted Evil
i tried it with a triangle, and i never got it perfect at the TP's. the VCA'a are stripped down.
anyways, unlike other ringmods you could not use this modulator as a VCA. it is a weird voltage mangler in the end...

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jumunius



Joined: Apr 19, 2010
Posts: 346
Location: San Francisco, CA
Audio files: 13

PostPosted: Sat Dec 10, 2011 5:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
you never will get out what you put in Twisted Evil
i tried it with a triangle, and i never got it perfect at the TP's. the VCA'a are stripped down.
anyways, unlike other ringmods you could not use this modulator as a VCA. it is a weird voltage mangler in the end...


Oh, ok, well, good to know. A little mangling always comes in handy. Good to know to expect it! Smile

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