Resistors (was: RE: [sdiy] Vote for your favorite noise sourc e)

[Batz Goodfortune]

Y-ellow Roman 'n' All.

At 01:18 PM 5/15/02 +0200, Sowa Roman wrote:
>That's the problem. I don't stock full range of values, and
>when I want to make something so strange as PRNG with
>FIR, and suddenly I miss 53.8k resistor, it's not convenient
>for me to search for it in shops or on the web. I'd rather
>use 56k and something above 1M in paralel.
>Or, if I could, laser trim them ;)

You don't need to, Though it would definitely be fun trying. Resistors can 
be trimmed by filing up to the value you want. It takes a bit of practice 
and care but it works and it's often convenient. Many years ago, some may 
remember I made a tutorial on how to do this. It's now back up on my web 
site (Somewhere. you'll have to do a bit of hunting. I don't do a lot of 
html these days because I hate it.)  Works best with carbon film but can 
work with certain stocks of metal films. Somewhere below 5K are trimmable 
but above 10K your mileage may vary.

Once upon a time, this kind of thing use to be common practice but it's 
become a lost art. There was some controversy when I put this up the first 
time round from people who just couldn't deal with it for some reason. So 
if you visit the site, deal with it as you see fit. Just don't try and 
re-educate me in kosha electronic practices like one looser took it upon 
himself to do.

Roman, I know you love SMD and I have to say I've never tried this with SMD 
but it still probably works, you just need a smaller file. I'm yet to catch 
up with the rest of the world with this new fangled electronics stuff.

Hope this helps.
Be absolutely Icebox.

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