Newsgroups: comp.robotics
Subject: 2 circuit design questio
From: andrew.jenkins@pcohio.com (Andrew Jenkins)
Path: brunix!news.Brown.EDU!agate!howland.reston.ans.net!gatech!usenet.ins.cwru.edu!ncoast!pcohio!andrew.jenkins
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Message-ID: <24.4510.2500.0NB2D7F3@pcohio.com>
Date: Sat, 26 Feb 94 12:59:00 -0500
Organization: PC-OHIO PCBOARD - Cleveland, OH - 216-381-3320
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<<  JF2@UKC.AC.UK to ALL   on    2 circuit design questio  >>

J >1. How do I go about producing a programmable variable resistance ?
J >   i.e. I want to be able to send either serial, or preferably parallel
J >   data to a 'device'/piece of circuit/whatever that will make the
J >   device/thing change it's resistance. A computer controlled 
J >potentiometer,
J >   if you will.

National Semiconductor and Dallas Semiconductor both make digital 
potentiometers. I'm afraid I don't have the device #s handy here at home 
though. The National parts are more limited in their range, but the 
Dallas part was developed for the audio industry, so it has continuous 
values, ie, 1,2,3,4,5, etc. I believe that it is addressable using 
parallel data. I'll try to get back to you w/ specs.
One other thing. These are strictly signal-level devices. No large 
current carrying capability.
Remind me w/another message and I'll try to get the #s for you.

Regards,


AJ



AJ

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