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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Single Buss 1V/Octave Keyboard Controller
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crashlander42



Joined: Oct 21, 2006
Posts: 292
Location: Orlando, FL (US)
PostPosted: Fri Mar 02, 2007 6:06 pm    Post subject: Single Buss 1V/Octave Keyboard Controller
Subject description: also a question about the Ray Wilson +/- 12vdc power supply		 Reply with quote  Mark this post and the followings unread
I would have to start by saying that I'm still learning.

Normally I try to match exactly what the schematics call for since I really don't understand enough about what I'm doing to feel confident about substituting parts yet. On the keyboard controller there are a few resistors that are marked as 1%, but I only have the correct value in my 5% resistors. Also there are a couple that are listed as say 475ohm and I only have a 470ohm resistor, or 3meg and I only have a 3.3meg resistor. Is it going to effect the final outcome of the design tremendously if I throw in a few "close enough" resistors? What kind of tolerance ranges do I normally have when substituting resistors?

Also...

Has anyone built the Ray Wilson 12VDC power supply? I usually do my boards from toner transfer and was wondering if anybody knew what the dimensions of the final board should be.

Thanks!
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PostPosted: Fri Mar 02, 2007 6:52 pm    Post subject: Re: Single Buss 1V/Octave Keyboard Controller
Subject description: also a question about the Ray Wilson +/- 12vdc power supply		 Reply with quote  Mark this post and the followings unread
crashlander42 wrote:
What kind of tolerance ranges do I normally have when substituting resistors?


The obvious answer would be "as specified in the schematics". The 1% ones should be accurate within 1%, for the others 5% would be OK. When you have 5% resistors only you could measure them, or just take the gamble, chances are pretty good it will be accurate within 1% as well.

When deviating from valus like 3M to 3M3 it would of course be helpfull to have some insight in the circuit to ba able to make a judgement, but without that you can always experiment. Jan Boerman, a dutch composer, once said "the purpose of the experiment is to determine the nature of it's failure". The deviations as suggested by you are safe enough to not blow anything, go ahead, try, the results might not be perfect, but you'll learn from it, and you'll have the fun of having done it. With time improvements in judgement will come, that is, when you try Very Happy
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also .. could someone please turn down the thermostat a bit.
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