Cooling system
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Posts: 46,084
Hello everyone,
I need to add an active cooling fan to a voltage regulator and have
it switch on until the regulator is cooled down and then switch off.
I plan on doing this with a thermistor whose voltage drop is
monitored by a Stamp using A2D.
My question is how do I reliably attach the thermistor to the
regulator so that adequate heat is transferred to the thermistor. At
this point I'm thinking some kind of epoxy but wanted peoples
suggestions. Thanks in advance.
-Dave
I need to add an active cooling fan to a voltage regulator and have
it switch on until the regulator is cooled down and then switch off.
I plan on doing this with a thermistor whose voltage drop is
monitored by a Stamp using A2D.
My question is how do I reliably attach the thermistor to the
regulator so that adequate heat is transferred to the thermistor. At
this point I'm thinking some kind of epoxy but wanted peoples
suggestions. Thanks in advance.
-Dave
Comments
over 400 degrees. We use it to hold clutch plates to the
clutch housings on model helicopters and I know of no
instance where it has ever failed. You can get it at most
hobby and home improvement stores.
--
Regards
Dave Evartt
American Hovercraft
Look at www.arcticsilver.com
(some may have paint marking, but this can be lightly sanded off on the mating
side)
Cyanoacrillate "a.k.a. superglue" was originally designed for medical use
in bonding bone to ceramic and even bone to stainless steel or steel to
ceramic.
I personally have mounted ceramic devices to aluminum heatsinks by applying
superglue to the metal and the pressing the ceramic to
it.
NOTE: Do NOT attempt to apply superglue directly to ceramic, it's bonding with
ceramic, bone and human tissue is instantaneous, but
when applied to metal it remains liquid till the ceramic, or your finger touches
it, then it hardens instantaneously.
I don't know it's thermal resistance, but I can tell you it works very well both
in terms of holding for many years and in terms of
heat transfer.
KF4HAZ - Lonnie
From: "nuclearspin2000" <nuclearspin2000@y
> Hello everyone,
>
> I need to add an active cooling fan to a voltage regulator and have
> it switch on until the regulator is cooled down and then switch off.
> I plan on doing this with a thermistor whose voltage drop is
> monitored by a Stamp using A2D.
>
> My question is how do I reliably attach the thermistor to the
> regulator so that adequate heat is transferred to the thermistor. At
> this point I'm thinking some kind of epoxy but wanted peoples
> suggestions. Thanks in advance.
>
> -Dave
In the "pre-Stamp" days I had a very similar application -- using a signal
from a thermistor to activate a relay at a specific (and in this case,
adjustable) temperature. A very inexpensive voltage comparator IC can be
used. A few words about my application and a link to a very good intro page
about comparators is here:
http://www.glitchbuster.com/#LatestUpdates
Randy
www.glitchbuster.com
Original Message
From: "nuclearspin2000" <nuclearspin2000@y...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, January 08, 2004 9:38 PM
Subject: [noparse][[/noparse]basicstamps] Cooling system
> Hello everyone,
>
> I need to add an active cooling fan to a voltage regulator and have
> it switch on until the regulator is cooled down and then switch off.
> I plan on doing this with a thermistor whose voltage drop is
> monitored by a Stamp using A2D.
>
> My question is how do I reliably attach the thermistor to the
> regulator so that adequate heat is transferred to the thermistor. At
> this point I'm thinking some kind of epoxy but wanted peoples
> suggestions. Thanks in advance.
>
> -Dave
>
>
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>
>
devices and and just epoxy it to the place I wanted to
monitor.
my 2 cents
===========
In the "pre-Stamp" days I had a very similar application --
using a signal
from a thermistor to activate a relay at a specific (and in
this case,
adjustable) temperature. A very inexpensive voltage
comparator IC can be
used. A few words about my application and a link to a very
good intro page
about comparators is here:
http://www.glitchbuster.com/#LatestUpdates
--
Regards
Dave Evartt
American Hovercraft
-Dave
--- In basicstamps@yahoogroups.com, "Randy Jones" <randyjones@w...>
wrote:
> Hi Dave,
>
> In the "pre-Stamp" days I had a very similar application -- using a
signal
> from a thermistor to activate a relay at a specific (and in this
case,
> adjustable) temperature. A very inexpensive voltage comparator IC
can be
> used. A few words about my application and a link to a very good
intro page
> about comparators is here:
>
> http://www.glitchbuster.com/#LatestUpdates
>
> Randy
> www.glitchbuster.com
>
>
>
Original Message
> From: "nuclearspin2000" <nuclearspin2000@y...>
> To: <basicstamps@yahoogroups.com>
> Sent: Thursday, January 08, 2004 9:38 PM
> Subject: [noparse][[/noparse]basicstamps] Cooling system
>
>
> > Hello everyone,
> >
> > I need to add an active cooling fan to a voltage regulator and
have
> > it switch on until the regulator is cooled down and then switch
off.
> > I plan on doing this with a thermistor whose voltage drop is
> > monitored by a Stamp using A2D.
> >
> > My question is how do I reliably attach the thermistor to the
> > regulator so that adequate heat is transferred to the thermistor.
At
> > this point I'm thinking some kind of epoxy but wanted peoples
> > suggestions. Thanks in advance.
> >
> > -Dave
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the
Subject and
> Body of the message will be ignored.
> >
> >
> > Yahoo! Groups Links
> >
> > To visit your group on the web, go to:
> > http://groups.yahoo.com/group/basicstamps/
> >
> > To unsubscribe from this group, send an email to:
> > basicstamps-unsubscribe@yahoogroups.com
> >
> > Your use of Yahoo! Groups is subject to:
> > http://docs.yahoo.com/info/terms/
> >
> >
of them around here.
-Dave
--- In basicstamps@yahoogroups.com, "nuclearspin2000"
<nuclearspin2000@y...> wrote:
> Hello everyone,
>
> I need to add an active cooling fan to a voltage regulator and have
> it switch on until the regulator is cooled down and then switch
off.
> I plan on doing this with a thermistor whose voltage drop is
> monitored by a Stamp using A2D.
>
> My question is how do I reliably attach the thermistor to the
> regulator so that adequate heat is transferred to the thermistor.
At
> this point I'm thinking some kind of epoxy but wanted peoples
> suggestions. Thanks in advance.
>
> -Dave
others. Tra-Con makes a pretty good thermally conductive/electrically
insulative epoxy. I think Master Bond has some like that too. If you
don't want to go to that expense and wait you might try using sodium
silicate (waterglass). It is cheap, fire resistant and nontoxic. I have
used it to set thermocouples onto things that get hot. Mix it with water
to make a goo then put a little on your thermistor or thermocouple and
let it dry over night. If you can't put it right on the component, use
the waterglass to mount the thermistor in an uncrimped spade lug then,
after it dries, mount the spade lug to what you want to monitor. If you
want a quick and dirty temporary fix, try putting the thermistor in the
spade lug and then squirting in some silicon heat sink compound. It is
kind of messy but it works ok.
On Fri, 09 Jan 2004 05:38:50 -0000 "nuclearspin2000"
<nuclearspin2000@y...> writes:
> Hello everyone,
>
> I need to add an active cooling fan to a voltage regulator and have
>
> it switch on until the regulator is cooled down and then switch off.
>
> I plan on doing this with a thermistor whose voltage drop is
> monitored by a Stamp using A2D.
>
> My question is how do I reliably attach the thermistor to the
> regulator so that adequate heat is transferred to the thermistor. At
>
> this point I'm thinking some kind of epoxy but wanted peoples
> suggestions. Thanks in advance.
>
> -Dave
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the
> Subject and Body of the message will be ignored.
>
>
> Yahoo! Groups Links
>
> To visit your group on the web, go to:
> http://groups.yahoo.com/group/basicstamps/
>
> To unsubscribe from this group, send an email to:
> basicstamps-unsubscribe@yahoogroups.com
>
> Your use of Yahoo! Groups is subject to:
> http://docs.yahoo.com/info/terms/
>
>
>
>
________________________________________________________________
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I use the epoxy brand some branches of the military use to "glue"
missile skins on (no can use rivets at multi-mach). Seems to work well
on the back of a TO-220 heatsink that has been sanded at the interface.
One supplier makes getting it easy.
http://www.wassco.com/hysepkit.html
The stuff is incredible. I've used it (along with a steel worm clamp
reinforcing ring) to contain refrigerant in a hot condenser whose
pressures were in the 400 to 500 pound range. That Fix Or Repair Daily
when to the junkyard with a good refrigeration system. I've also used
it to imbed stuffing boxes on RC boats or bond broken PC boards
together. Handy stuff.
To monitor component temps, I use a 10K or 50K NTC thermistor in a
RCTIME circuit. The UNpreferred configuration with a .1 cap to ground
eliminates most of the noisy readings (Thank you Tracy).
When things go badly (unexpected high heat) the epoxy will discolor, but
continue to hold where super glue will fail.
nuclearspin2000 wrote:
>
> Hello everyone,
>
> I need to add an active cooling fan to a voltage regulator and have
> it switch on until the regulator is cooled down and then switch off.
> I plan on doing this with a thermistor whose voltage drop is
> monitored by a Stamp using A2D.
>
> My question is how do I reliably attach the thermistor to the
> regulator so that adequate heat is transferred to the thermistor. At
> this point I'm thinking some kind of epoxy but wanted peoples
> suggestions. Thanks in advance.
>
> -Dave
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and Body
of the message will be ignored.
>
>
> Yahoo! Groups Links
>
> To visit your group on the web, go to:
> http://groups.yahoo.com/group/basicstamps/
>
> To unsubscribe from this group, send an email to:
> basicstamps-unsubscribe@yahoogroups.com
>
> Your use of Yahoo! Groups is subject to:
> http://docs.yahoo.com/info/terms/