There are thermal pads that are thermally conductive. You typically see
them in laptops and, oddly, optical drives. They're usually one or two
mm thick and very soft and squishy. Pull the bottom plate off any
full-size optical drive and you'll probably find one or two pieces. I
see lots of them on the auction site, but I have no personal experience
with those. It looks like there's at least one or two that are
available in large pieces and I saw thicknesses from 0.4mm up to 4.0mm.
I wouldn't expect these to move heat nearly as well as a thin layer of
thermal grease (which is itself a thermal insulator), but for some
applications it works and is the only practical solution.
Ed
On 8/27/2012 10:12 AM, Bob Camp wrote:
Hi
The pad stuff is normally an insulator. It's not very stable, so there may
be better alternatives.
Bob
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of [email protected]
Sent: Monday, August 27, 2012 10:44 AM
To: [email protected]
Subject: Re: [time-nuts] newbie question Thunderbolt supply
There are components and traces.
Bert
In a message dated 8/27/2012 10:10:45 A.M. Eastern Daylight Time,
[email protected] writes:
Are these thermal pads temp conductive or insulative? If you want heat
dissipation why not use the readily available thermal grease used for
semiconductor mounting? Cheap and not really messy if applied correctly
jerry
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of [email protected]
Sent: Monday, August 27, 2012 9:38 AM
To: [email protected]
Subject: Re: [time-nuts] newbie question Thunderbolt supply
Thank you. Will look for it here under thermal pad.
Bert
In a message dated 8/27/2012 8:08:30 A.M. Eastern Daylight Time,
[email protected] writes:
Here in Europe Farnell has the 3M thermal pad in sheets (105x150mm)...
On Mon, Aug 27, 2012 at 12:48 PM, ew <[email protected]> wrote:
Chris
Starting with 3.4 W used by the Tbolt my battery version burns 4.4 W.
Using a switcher do generate 7 V 4.8 W and running the 7805 directly
from 14.5 V 6.2.W. I use like you an IC temp sensor, two stage op amp
driving a fan holding the backplate temp constant and total power
goes up to 7.6 W since the oven has to work harder. T bolt, switchers
and all regulators are on the other side of the 3/32" Alu plate. The
AC switcher
is
not included in the power numbers. but is also on the plate. Plate is
held
at 40 C.
I am looking for a way to more closely couple the Tbolt circuit board
to the back plate and am looking for the material switchers use
between semiconductor and cooling plate Any one know where I can buy
it in sheet form?
Bert Kehren
-----Original Message-----
From: Chris Albertson <[email protected]>
To: Discussion of precise time and frequency measurement <
[email protected]>
Sent: Sun, Aug 26, 2012 12:31 pm
Subject: Re: [time-nuts] newbie question Thunderbolt supply
On Sun, Aug 26, 2012 at 3:46 AM, <[email protected]> wrote:
Having played with several solutions I found the best is a 12 V 1 A
switcher with the output voltage increased to 15 V, check the
capacitors and if necessary replace with 25 V. I laid out a PC
board that has a TC7662A inverter followed by a 79L12. Also on the
board is a 7812 followed by
a
7805.
Putting them in series gives me good thermal distribution. ....
ne of the advantages of generating waste heat like that is that you
can ut the heat to good use. I build a temperature controlled fan.
It is ery simple a temperature sensor IC connects to an opamp that
drives a ower transistor that drives a 12V fan.
As for the power supply. I used a filter that does not drop any
volts
and
can't see any RF on the DC using my old 365 Tek scope or by using a
more
ensitive RF power meter.
hris Albertson
edondo Beach, California
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