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From: Jim Thompson
Subject: Re: translate input resistance to output resistance
X-Newsreader: Forte Agent 1.91/32.564
Date: Mon, 11 Nov 2002 18:40:20 GMT
NNTP-Posting-Date: Mon, 11 Nov 2002 13:40:20 EST
Organization: Cox Communications
On 11 Nov 2002 10:28:07 -0800,
firstname.lastname@example.org (Peter Jeffe),
In Newsgroup: sci.electronics.design,
Entitled: "translate input resistance to output resistance",
Wrote the following:
|I posted this to s.e.basics but haven't gotten a response, so maybe
|it's not as basic as I thought. Hopefully someone here will be able
|I want to convert the resistance generated by my car's steering-wheel
|controls for the factory stereo to different values for an aftermarket
|stereo. So I want a circuit that takes a set of input resistances and
|"produces" a different set of output resistances.
|There are six control switches that form a resistor bridge and
|generate a resistance of from 82 to 1474 ohms across a single output
|wire. For each of those six input resistance values (and maybe more,
|from two switches being pressed at once) I want to be able to
|"convert" it to a specific value in the range of about 2k-24k. The
|voltage being put across the resistor bridge is 5 VDC.
|In other words, I want something that behaves as follows (with example
|Input Ohms Output Ohms
|You get the idea: there's no relationship between the input and output
|resistances, so each value translation has to be discrete. All I can
|come up with is some combination of transistors bridged in parallel
|and series to get the desired result, but I'm hoping there's a simple
|analog switch-type circuit that can be configured to produce this.
|Thanks for any help.
Why don't you post *all* possible input-output pairs so that we know
the complete mapping requirements?
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
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