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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Finding or Replacing Components
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Sound Diver



Joined: Mar 26, 2010
Posts: 16
Location: Preston U.K

PostPosted: Tue Oct 25, 2011 3:31 am    Post subject: Finding or Replacing Components Reply with quote  Mark this post and the followings unread

I'm in the process of building a 24Db filter, State variable filter and a Quantizer, i seem to be having problems finding a couple of items in the UK, namely 2nF Caps & 49k9 resistors. Now i Know Ray has gone to a lot of trouble to arrive at these values but is it a good idea to replace 49k9 res for a 50k res and replace 2nF cap for a 2.2nF cap without screwing the circuit's up. I can find the resistor but it would mean buying it from major suppliers at a premium rate.
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prgdeltablues



Joined: Sep 25, 2006
Posts: 182
Location: UK
Audio files: 11

PostPosted: Tue Oct 25, 2011 5:29 am    Post subject: Reply with quote  Mark this post and the followings unread

Not built those particular modules, but from the schematics, neither value is likely to be critical. The 49.9k resistors are just limiting the range of the resonance pot - you could use 47k there without noticing it. And the 2n cap is stated as ceramic, so unlikely to be better than 20% anyway - 2n2 should do fine.
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ashleym



Joined: Aug 20, 2009
Posts: 181
Location: uk

PostPosted: Wed Oct 26, 2011 7:47 am    Post subject: Reply with quote  Mark this post and the followings unread

I had the same issue and just used standard parts. In my case it was for an Ultimate and everything works OK for me. Any problems I can put down to analogue warmth.

For the quantiser you can get the precision resistors from Rapid (as you are in the UK)

http://www.rapidonline.com/Electronic-Components/0-4W-0-1-15ppm-Precision-metal-film-resistors-60260
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