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 Forum index » DIY Hardware and Software » YuSynth
Noise gen / Sample & Hold cap substitute
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feggster



Joined: Sep 12, 2011
Posts: 52
Location: uk

PostPosted: Fri Apr 12, 2013 5:33 am    Post subject: Noise gen / Sample & Hold cap substitute Reply with quote  Mark this post and the followings unread

hi, I'm building this module and have no 680nf cap! can I sub it for 1uf ?
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hv0190



Joined: Apr 18, 2011
Posts: 23
Location: Munich

PostPosted: Tue Apr 16, 2013 8:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi,
If you use a 1uF instead of a 680nF cap what you actually do is change the time constant (TC = r*c), in other words: it simply takes longer to charge and discharge the cap, or again in other words: this will make the slewing time longer (experts correct me if I'm wrong).
Just give it a try, it shouldn't spoil the functionality of the rest of the module.
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philoop



Joined: Aug 19, 2011
Posts: 14
Location: hamburg

PostPosted: Tue Apr 16, 2013 10:29 am    Post subject: Noise gen / Sample & Hold cap substitute Reply with quote  Mark this post and the followings unread

I use for my sample and hold 1nf polystyrol
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elmegil



Joined: Mar 20, 2012
Posts: 1535
Location: Chicago
Audio files: 14

PostPosted: Tue Apr 16, 2013 10:30 am    Post subject: Reply with quote  Mark this post and the followings unread

I usually try and see if I have two caps I can put in parallel that will add up to the value (or near the value) I need.

470 + 220 is close, 560 + 120 would be dead on.....
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feggster



Joined: Sep 12, 2011
Posts: 52
Location: uk

PostPosted: Tue Apr 16, 2013 3:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

thanks for replying, I ended up ordering some 680nf caps, before that It was a toss up between 1uf or 470nf and 2x 100nf Smile
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