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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Sample And Hold With VC-Clock Questions
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KnobHell



Joined: Jan 28, 2012
Posts: 58
Location: SLC

PostPosted: Tue Jul 10, 2012 5:40 am    Post subject: Sample And Hold With VC-Clock Questions Reply with quote  Mark this post and the followings unread

Hi,

Do Q1 and Q2 the 2N3904's need to be matched?

Are there any changes to operate from 15 volts?

Thanks!

len
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Feifer



Joined: May 16, 2012
Posts: 46
Location: San Diego

PostPosted: Tue Jul 10, 2012 9:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hey Len,
No need to match to match those I think. Matching transistors like in this case is really only necessary if you want to improve tracking through 1V/oct, which for the sample rate of a S/H to me seems silly. Although someone out there might have a use for it.

You will have to change some resistor values if you use 15V. The obvious places are where you have reference voltages via a divider. See R25, R26. Unless someone chimes in with it all worked out already, I would suggest breadboarding first.
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KnobHell



Joined: Jan 28, 2012
Posts: 58
Location: SLC

PostPosted: Wed Jul 11, 2012 7:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Feifer wrote:
Hey Len,
No need to match to match those I think. Matching transistors like in this case is really only necessary if you want to improve tracking through 1V/oct, which for the sample rate of a S/H to me seems silly. Although someone out there might have a use for it.

You will have to change some resistor values if you use 15V. The obvious places are where you have reference voltages via a divider. See R25, R26. Unless someone chimes in with it all worked out already, I would suggest breadboarding first.


Thanks Feifer.

Certainly, if anyone had built this for 15 volts please let me know which mods worked for you.

len
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