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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Soundlab mini mk2 vco2 problem/ question
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ToriD



Joined: Mar 22, 2013
Posts: 12
Location: Usa

PostPosted: Wed Apr 10, 2013 8:24 pm    Post subject: Soundlab mini mk2 vco2 problem/ question Reply with quote  Mark this post and the followings unread

Vco 2 sounds different then vco1

It is lower in volume and when I turn the frequency all the way down and the pwm all the way up the sound cuts out which it doesn't on vco 1
The other thing is the oscillation has random interferences

I have not calibrated the vcos yet but I have tried to unjust the trim pots to get them to at least be at the same volume

Any ideas what to do?

Is it normal or expectable for them to not act the same? or should they be pretty close?
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elmegil



Joined: Mar 20, 2012
Posts: 1345
Location: Chicago
Audio files: 14

PostPosted: Thu Apr 11, 2013 5:22 am    Post subject: Reply with quote  Mark this post and the followings unread

Assuming it's like the other Soundlabs, they should be pretty similar in behavior. Not sure offhand what the problem might be though, my main recommendation would be recheck the traces and components in the section for VCO 2 and where it connects in to other "modules" of the synth.
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ToriD



Joined: Mar 22, 2013
Posts: 12
Location: Usa

PostPosted: Fri Apr 12, 2013 7:29 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi elmegil

Thanks for your response!

I'v made a discovery today that might be a clue to my problem

(I am still far from understanding electronics so I am not sure what to make of this:)

If I touch the cap at c21 with my finger tip the pitch in vco2 changes
This does not happen if I touch the same cap on vco1

Back to vco2 if I touch the transistor q12 on vco2 it as well changes the pitch
But again if I do the same to vco1 "rock solid" no change

Any idea what migh be going on here?

Thanks- Tori
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elmegil



Joined: Mar 20, 2012
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PostPosted: Sat Apr 13, 2013 7:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Unfortunately I don't have anything but generic advice for that.

Check the solder joints on all those components. Just hit them briefly with the iron and reflow the solder and see if they're still touch sensitive.
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ToriD



Joined: Mar 22, 2013
Posts: 12
Location: Usa

PostPosted: Mon Apr 15, 2013 9:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks anyway Elmegil

Your alway a great help
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