Timeline for Are there electrically controlled precision rheostats that are not solid state
Current License: CC BY-SA 3.0
21 events
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| Apr 13, 2017 at 12:32 | history | edited | CommunityBot |
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| Sep 21, 2016 at 3:15 | comment | added | user1172468 | @IgnacioVazquez-Abrams -- the resistors are a very important part of an analog computer -- I quickly scanned a couple of papers and it seems that signal distortion is an issue. Not sure if you still think I should continue with that path. | |
| Sep 21, 2016 at 2:52 | comment | added | user1172468 | @IgnacioVazquez-Abrams -- thanks let me look at that. | |
| Sep 21, 2016 at 2:50 | comment | added | Ignacio Vazquez-Abrams | A JFET and an op amp. | |
| Sep 21, 2016 at 2:49 | vote | accept | user1172468 | ||
| Sep 21, 2016 at 2:49 | vote | accept | user1172468 | ||
| Sep 21, 2016 at 2:49 | |||||
| Sep 21, 2016 at 2:47 | comment | added | user1172468 | @IgnacioVazquez-Abrams -- I mean really I think I know as much -- do you have something that is helpful or are you just having a bad day -- I've thought my application through and I'm asking for help. Can you help me? | |
| Sep 21, 2016 at 2:46 | comment | added | user1172468 | @pipe - apparently someone has built such a product (must've been dreaming). I must admit I was a bit annoyed at your snide comment. I don't know what your flair is as an electrical engineer - I studied at EE at a top 5 school 20 years ago and did ok, didn't work in EE professionally. Rather than snide remarks it is beneficial to be helpful and if you cannot - save the white space on the web page. On mathematics - that's how I put bread on my table - want to try fencing mathematically - I'm not the one who'll end up bleeding. So have some respect -- I'm sure your momma tried to teach you that | |
| Sep 21, 2016 at 2:40 | comment | added | Ignacio Vazquez-Abrams | "Solid state" doesn't mean "digital". | |
| Sep 21, 2016 at 2:38 | history | edited | user1172468 | CC BY-SA 3.0 |
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| Sep 21, 2016 at 2:38 | comment | added | pipe | That's far better than any motorized control. | |
| Sep 21, 2016 at 2:36 | answer | added | WhatRoughBeast | timeline score: 1 | |
| Sep 21, 2016 at 2:33 | comment | added | user1172468 | @Ignacio Vazquez-Abrams, I looked at digitally controlled resistors but they seem to be composed of active components and come in discreet steps -- typically 256 and sometimes 1024 | |
| Sep 21, 2016 at 2:25 | comment | added | user1172468 | you are correct in that this is fun project -- if I wanted to be practical I would just solve the state space equations digitally using matlab | |
| Sep 21, 2016 at 2:24 | comment | added | user1172468 | @Bradman175, thanks for the comment ... so I can use a MOSFET as a precision resistor? | |
| Sep 21, 2016 at 2:23 | comment | added | pipe | Sounds to me that this is just a dream project from someone who hasn't tried to do the math and found out what kind of precision and accuracy you need. | |
| Sep 21, 2016 at 2:22 | comment | added | user1172468 | @DaveTweed fair point -- but I reckon that a digital ohm meter uses pretty precision measurement techniques? or am I missing something ? thanks | |
| Sep 21, 2016 at 2:10 | comment | added | Bradman175 | A MOSFET is basically a voltage controlled resistor. All you need to do know is combat the odd curve. | |
| Sep 21, 2016 at 2:07 | comment | added | Dave Tweed | Make up your mind -- in one paragraph, you say you don't want anything with discrete steps, but in another, you say you'll use a digital ohmmeter. How exactly do you intend to specify the desired value of the resistance? | |
| Sep 21, 2016 at 2:07 | comment | added | Ignacio Vazquez-Abrams | Is solid state really not an option? There are analog solid state solutions. | |
| Sep 21, 2016 at 2:04 | history | asked | user1172468 | CC BY-SA 3.0 |