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 Forum index » DIY Hardware and Software
Bergfotron Saw to Tri-SIne troubleshooting
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isak



Joined: Dec 13, 2009
Posts: 730
Location: Israel
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PostPosted: Thu Jan 24, 2013 3:52 pm    Post subject: Bergfotron Saw to Tri-SIne troubleshooting
Subject description: need help please
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Hi guys.

i built this waveshaper but its not working, its only giving me inverted Saw at the Tri output, because i dont get a Tri i'm not getting the Sine.
it looks very simple but where i did wrong?
what i need to check?

im using the Odyssey vco Saw as a my source.

http://hem.bredband.net/bersyn/VCO/Saw%20to%20tri-sin%20W.gif
http://hem.bredband.net/bersyn/VCO/Saw2tri-sine_K.pdf


Saw to Tri-Sine + resistors map.png
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Saw to Tri-Sine + resistors map.png



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isak



Joined: Dec 13, 2009
Posts: 730
Location: Israel
Audio files: 18

PostPosted: Fri Jan 25, 2013 7:18 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:

Where did you find the mixer layout for the Saw2tri-sine_K.pdf? I've been all over the Bergfotron site and can't locate it. I'd like to see the PCB layout to see what's going on... thanks....


The link is from his site Wink

http://hem.bredband.net/bersyn/VCO/Saw2tri-sine_L.pdf

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marvkaye



Joined: Mar 14, 2011
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PostPosted: Fri Jan 25, 2013 12:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

cool... got it. I'll take a look later...hope I find something for you.

<marv>
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isak



Joined: Dec 13, 2009
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PostPosted: Fri Jan 25, 2013 3:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Marv

I got an answer from Bergfotron.
Quote:
You need to make sure that the input signal has the correct amplitude and DC-offset. Otherwise you will not get the correct waveforms.
The sawtooth should be 10 volts peak to peak and have no DC offset (IIRC).


Now I need to find a way to do it Confused

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isak



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PostPosted: Fri Jan 25, 2013 11:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi...

I got it working!
Amplified the signal of the ody saw and it's working great Smile
I used Andy suggestion from page 8 on the ody vco thread.
http://www.electro-music.com/forum/topic-28604-175.html

Cheers Smile

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marvkaye



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PostPosted: Sat Jan 26, 2013 6:18 am    Post subject: Reply with quote  Mark this post and the followings unread

XLNT news! Glad to hear you got it working. Your decoding of the resistors looked right and assuming all the other components were also correct I figured it had to be something else. Bergfotron pointing you in the right direction makes perfect sense.... who else could know better. Enjoy.

<marv>
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