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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Volts Per Octave calibrator zener voltage question
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Appliancide*



Joined: Jul 04, 2007
Posts: 117
Location: Paul lives in Thief River Falls

PostPosted: Wed May 15, 2013 11:43 am    Post subject: Volts Per Octave calibrator zener voltage question
Subject description: 9.5 or 10v ok?
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I have 3.9, 5.6 and 10v zeners, but no 9.1v. Is that exact voltage important, or could I use a 10v or combine the other two to make a 9.3v zener reference?
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marvkaye



Joined: Mar 14, 2011
Posts: 225
Location: Fla

PostPosted: Wed May 15, 2013 5:07 pm    Post subject: Re: Volts Per Octave calibrator zener voltage question
Subject description: 9.5 or 10v ok?
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Appliancide* wrote:
I have 3.9, 5.6 and 10v zeners, but no 9.1v. Is that exact voltage important, or could I use a 10v or combine the other two to make a 9.3v zener reference?


Read this thread. The last message suggests replacing the zener with a 10V precision shunt voltage reference. I installed one in my calibrator and it eliminated drift and made getting it all dialed in much easier. It's rock solid now. IHTH

<marv>
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Appliancide*



Joined: Jul 04, 2007
Posts: 117
Location: Paul lives in Thief River Falls

PostPosted: Wed May 15, 2013 6:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

I can report that putting the 3.9 and 5.6v zeners in series works just fine. I can also add better than my first post suggests!

If it seems too fiddly with the zeners, I will try the precision shunt that was suggested in that thread. Thanks for the tip marvkaye. Somehow I missed it when I was searching earlier.

Ray, thanks to this circuit and your videos, I have conquered my fear of 1V/Oct calibration!

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