Liquid Resistor
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Posts: 46,084
Where can I find a liquid that is a very good insulator? As good or better
than air.
Thanks!!
than air.
Thanks!!
Comments
By definition air is 1.
Mineral oil is around 2.2. Some vegetable oils are 3 or higher (I'm not
sure, but it seems like canola oil is very high). You can find this in a CRC
handbook (the chemistry/physics one) which should be at any library you can
think of.
Oil is the traditional choice for cooling power resistors and transformers.
Be wary of old-style transformer oil, though -- it contains something nasty
(PCBs? PCVs? I forget and my hazcom training is faded).
Water seems good, but impurities in it reduce its insulating properties plus
it is hard to keep water clean and present.
Al Williams
AWC
* Floating point math for the Stamp, PIC, SX, or any microcontroller:
http://www.al-williams.com/awce/pak1.htm
>
Original Message
> From: Cy Brown [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=RzlgSvFWmfz63mWta4g5rKbVgAhf-cYJS0V8kbyrOFmKEoBhOCZ9_DVD2Nx43_-5ZtDzNg5bvq1nt7U]bushman@t...[/url
> Sent: Wednesday, February 07, 2001 11:00 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Liquid Resistor
>
>
> Where can I find a liquid that is a very good insulator? As good
> or better
> than air.
>
> Thanks!!
>
>
>
with (about 400$ US/Gal.)
Here's a link:
http://www.3m.com/market/industrial/fluids/fluoprop.html
I was going to use it instead of water in my PC fluid cooling rig, but I
couldn't find anything smaller than 1 Gal. My system only takes 16oz.
Others have used it in that situation, with not too much temperature
reduction. Water was free, and right there, so it was used.
Also a cheap fluid would be mineral oil (aka transformer cooling fluid). AS
far as I know its non-conductive. And its easily available.
-Rob
PS
If you're wondering what the heck I'm doing water cooling a PC... here you
go:
http://www.aasdcat.com/rstaph/cooling/smartcase.html
Original Message
From: "Cy Brown" <bushman@t...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, February 08, 2001 12:00 AM
Subject: [noparse][[/noparse]basicstamps] Liquid Resistor
> Where can I find a liquid that is a very good insulator? As good or
better
> than air.
>
> Thanks!!
>
>
>
>
>
What do you mean by insulator? Non-conductive cooling fluid, high breakdown
voltage, low dielectric constant?
Ray McArthur
Original Message
From: Cy Brown <bushman@t...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, February 08, 2001 12:00 AM
Subject: [noparse][[/noparse]basicstamps] Liquid Resistor
> Where can I find a liquid that is a very good insulator? As good or
better
> than air.
(Staph).
I have, however, cooled power resistors.
Al Williams
AWC
* One day left to save on PAK-I and PAK-IV: http://www.al-williams.com/awce
>
Original Message
> From: Cy Brown [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=g2gztIA43_anRbz1MuRFt5jfQpHmf8H5MBqqlP7pCKX2r5rQPqY1g4HxeqGlOnvL0wMhO7RT3LbzNnsYt9k]bushman@t...[/url
> Sent: Thursday, February 08, 2001 10:46 AM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Liquid Resistor
>
>
> Yes, I want to be able to immerse my circuitry in liquid as if it where in
> air. Mineral oil seems to be the quick answer but will Im worrid about
> corrosion also. My project is similar to Al Williams but I want
> to see if I
> can immerse the whole machine in liquid. The idea is as much for
> the looks
> as it is for cooling. 3M Fluorinert may be the way to go, Ill
> just have to
> save up for it.
>
> Cy Brown
>
>
>
Original Message
> From: Ray McArthur <rjmca@u...>
> To: <basicstamps@yahoogroups.com>
> Sent: Thursday, February 08, 2001 12:44 AM
> Subject: Re: [noparse][[/noparse]basicstamps] Liquid Resistor
>
>
> Cy:
> What do you mean by insulator? Non-conductive cooling fluid,
> high breakdown
> voltage, low dielectric constant?
>
> Ray McArthur
>
>
Original Message
> From: Cy Brown <bushman@t...>
> To: <basicstamps@yahoogroups.com>
> Sent: Thursday, February 08, 2001 12:00 AM
> Subject: [noparse][[/noparse]basicstamps] Liquid Resistor
>
>
> > Where can I find a liquid that is a very good insulator? As good or
> better
> > than air.
>
>
>
>
>
>
>
>
>
air. Mineral oil seems to be the quick answer but will Im worrid about
corrosion also. My project is similar to Al Williams but I want to see if I
can immerse the whole machine in liquid. The idea is as much for the looks
as it is for cooling. 3M Fluorinert may be the way to go, Ill just have to
save up for it.
Cy Brown
Original Message
From: Ray McArthur <rjmca@u...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, February 08, 2001 12:44 AM
Subject: Re: [noparse][[/noparse]basicstamps] Liquid Resistor
Cy:
What do you mean by insulator? Non-conductive cooling fluid, high breakdown
voltage, low dielectric constant?
Ray McArthur
Original Message
From: Cy Brown <bushman@t...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, February 08, 2001 12:00 AM
Subject: [noparse][[/noparse]basicstamps] Liquid Resistor
> Where can I find a liquid that is a very good insulator? As good or
better
> than air.
friend telling another about the Christmas Tree lamp saver that he was
using, proudly announcing that I had built it for him. Huh? Inquiring,
he described the SELENIUM rectifier immersed in oil in a Skippy peanut
butter jar. He was still using it 30-40 years later to clip half of the AC
and thereby extend the life of the bulbs. VBG
What kind of oil? Darned if I remember- Probably SAE20 ;-
I sent him to the store to buy a $5 dimmer and a plastic box to put it in.
Wayne
At 10:34 AM 2/8/01 -0600, you wrote:
>Just for the record, I don't liquid cool my PC. That was someone else
>(Staph).
>
>I have, however, cooled power resistors.
>
>Al Williams
Wayne Roderick P.E. (EE, ret)
CEO, Teton Short Line, (NMRA life-1721)
e-mail tetonsl@i... Pocatello Idaho, USA
http://www.ida.net/users/tetonsl/railroad
Note new URL- /biz/ becomes /users/
a selenium rectifier charger to top off 12V batteries. I
remember him building this thing in the 50's - Filament
xfmr, selenium bridge, a light bulb for current limiting.
Wonder if it's the same bulb...
Jack
Wayne Roderick wrote:
>
> Getting a bit off topic but I had to share the humor. Overheard an old
> friend telling another about the Christmas Tree lamp saver that he was
> using, proudly announcing that I had built it for him. Huh? Inquiring,
> he described the SELENIUM rectifier immersed in oil in a Skippy peanut
> butter jar. He was still using it 30-40 years later to clip half of the AC
> and thereby extend the life of the bulbs. VBG
>
> What kind of oil? Darned if I remember- Probably SAE20 ;-
>
> I sent him to the store to buy a $5 dimmer and a plastic box to put it in.
friend telling another about the Christmas Tree lamp saver that he was
using, proudly announcing that I had built it for him. Huh? Inquiring,
he described the SELENIUM rectifier immersed in oil in a Skippy peanut
butter jar. He was still using it 30-40 years later to clip half of the AC
and thereby extend the life of the bulbs. VBG
What kind of oil? Darned if I remember- Probably SAE20 ;-
I sent him to the store to buy a $5 dimmer and a plastic box to put it in.
Wayne
At 10:34 AM 2/8/01 -0600, you wrote:
>Just for the record, I don't liquid cool my PC. That was someone else
>(Staph).
>
>I have, however, cooled power resistors.
>
>Al Williams
Wayne Roderick P.E. (EE, ret)
CEO, Teton Short Line, (NMRA life-1721)
e-mail tetonsl@i... Pocatello Idaho, USA
http://www.ida.net/users/tetonsl/railroad
Note new URL- /biz/ becomes /users/
im trying to send data wireless, but somehow i have 1-bs2 and 1-bs2sx but
they dont communicate??
any suggestion what is the problem???
Also one of my BS2, when i tried to to download a program is says that can
not find com1, and that it needs power supply??
But it works with others bs2??
so anybody knows what is the problem?
and if so, how can i fix it??
thank you.
>From: "Cy Brown" <bushman@t...>
>Reply-To: basicstamps@yahoogroups.com
>To: <basicstamps@yahoogroups.com>
>Subject: Re: [noparse][[/noparse]basicstamps] Liquid Resistor
>Date: Thu, 8 Feb 2001 10:45:38 -0600
>
>Yes, I want to be able to immerse my circuitry in liquid as if it where in
>air. Mineral oil seems to be the quick answer but will Im worrid about
>corrosion also. My project is similar to Al Williams but I want to see if
>I
>can immerse the whole machine in liquid. The idea is as much for the looks
>as it is for cooling. 3M Fluorinert may be the way to go, Ill just have to
>save up for it.
>
>Cy Brown
>
>
>
Original Message
>From: Ray McArthur <rjmca@u...>
>To: <basicstamps@yahoogroups.com>
>Sent: Thursday, February 08, 2001 12:44 AM
>Subject: Re: [noparse][[/noparse]basicstamps] Liquid Resistor
>
>
>Cy:
>What do you mean by insulator? Non-conductive cooling fluid, high
>breakdown
>voltage, low dielectric constant?
>
>Ray McArthur
>
>
Original Message
>From: Cy Brown <bushman@t...>
>To: <basicstamps@yahoogroups.com>
>Sent: Thursday, February 08, 2001 12:00 AM
>Subject: [noparse][[/noparse]basicstamps] Liquid Resistor
>
>
> > Where can I find a liquid that is a very good insulator? As good or
>better
> > than air.
>
>
>
>
>
>
>
>
>
>
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