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From: "Nucharin W. Jansen"
Subject: Re: !! Software to suggest parallel resistor values.
Date: Thu, 07 Nov 2002 05:10:18 +0700
Organization: C.S. Communications Co. Ltd.
References: <firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: Wed, 6 Nov 2002 22:10:20 +0000 (UTC)
X-Mailer: Mozilla 4.8 [en] (Windows NT 5.0; U)
I have my own perl script to calculate up to 3 resistors.
Because I have problem to calculate the value below 1 ohm.
Du you want it ?
Tony Williams wrote:
> In article <firstname.lastname@example.org>,
> adrian wrote:
> > Does anybody know of any software that can recommend two parallel
> > resistors values for a desired value eg 9.812 K 1/4 Watt 1 percent
> I don't know of anything available but I did write
> my own, for an ATE in the days when pots were not
> the done thing in avionics, so select-on-test
> resistors were used. It was based on a lookup
> table of one decade of the E96 range and did
> series or parallel combos.
> R's in parallel is a bummer, especially for close
> tolerance adjustings. This is because the fine
> tuning resistor easily gets to unreasonably high
> values, so the software has to detect this, back
> out, and re-iterate from a lower value primary
> R's in series was easier. I used as the primary
> resistor the highest prefered value whose +1% value
> did not exceed the unknown. The low-value fine tuner
> in series was just a run up the E96 LUT to find the
> the nearest prefered value.
> Tony Williams.
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