custom AlN insulator...

[John Larkin]

http://ryceramic.ruixiangmc.com/ made this for us.

https://www.dropbox.com/sh/un3la6swtaa8d1c/AABaNXadReMeGCBk7mz6QdIta?dl=0

Nice work, great pricing. We are using a CPU cooler as a heat sink for
some big mosfets.

AlN conducts heat about as well as aluminum alloys.



--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

 

[whit3rd]

On Wednesday, July 13, 2022 at 2:33:08 PM UTC-7, John Larkin wrote:

http://ryceramic.ruixiangmc.com/ made this for us.

https://www.dropbox.com/sh/un3la6swtaa8d1c/AABaNXadReMeGCBk7mz6QdIta?dl=0

Nice work, great pricing. We are using a CPU cooler as a heat sink for
some big mosfets.

AlN conducts heat about as well as aluminum alloys.

 

[John Larkin]

On Wed, 13 Jul 2022 18:06:17 -0700 (PDT), whit3rd <whit3rd@gmail.com>
wrote:

On Wednesday, July 13, 2022 at 2:33:08 PM UTC-7, John Larkin wrote:
http://ryceramic.ruixiangmc.com/ made this for us.

https://www.dropbox.com/sh/un3la6swtaa8d1c/AABaNXadReMeGCBk7mz6QdIta?dl=0

Nice work, great pricing. We are using a CPU cooler as a heat sink for
some big mosfets.

AlN conducts heat about as well as aluminum alloys.

Did you say anything? I\'m using Agent and only see my original stuff.

--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

 

[Clifford Heath]

On 14/7/22 07:32, John Larkin wrote:

http://ryceramic.ruixiangmc.com/ made this for us.
https://www.dropbox.com/sh/un3la6swtaa8d1c/AABaNXadReMeGCBk7mz6QdIta?dl=0
Nice work, great pricing. We are using a CPU cooler as a heat sink for
some big mosfets.

AlN conducts heat about as well as aluminum alloys.

How flat is it? I.e. how little contact grease can you get away with?

CH

 

[server]

On Sun, 17 Jul 2022 18:09:51 +1000, Clifford Heath
<no_spam@please.net> wrote:

On 14/7/22 07:32, John Larkin wrote:
http://ryceramic.ruixiangmc.com/ made this for us.
https://www.dropbox.com/sh/un3la6swtaa8d1c/AABaNXadReMeGCBk7mz6QdIta?dl=0
Nice work, great pricing. We are using a CPU cooler as a heat sink for
some big mosfets.

AlN conducts heat about as well as aluminum alloys.

How flat is it? I.e. how little contact grease can you get away with?

CH

I could measure that, but it is 1 mm thick and obviously polished very
flat. Our stack will be

K199 copper CPU cooler
grease
insulator
grease
four TO247 fets, shiny side up
6-layer PCB
backing plate

The cooler, with springs, screws into the backing plate.

The function is a 200 watt ac/dc programmable dummy load.

 

[Jan Panteltje]

On a sunny day (Sun, 17 Jul 2022 06:49:17 -0700) it happened
jlarkin@highlandsniptechnology.com wrote in
<g248dhtjba7s0306mgnd1dp8o2cp5pvdjp@4ax.com>:

On Sun, 17 Jul 2022 18:09:51 +1000, Clifford Heath
no_spam@please.net> wrote:

On 14/7/22 07:32, John Larkin wrote:
http://ryceramic.ruixiangmc.com/ made this for us.
https://www.dropbox.com/sh/un3la6swtaa8d1c/AABaNXadReMeGCBk7mz6QdIta?dl=0
Nice work, great pricing. We are using a CPU cooler as a heat sink for
some big mosfets.

AlN conducts heat about as well as aluminum alloys.

How flat is it? I.e. how little contact grease can you get away with?

CH

I could measure that, but it is 1 mm thick and obviously polished very
flat. Our stack will be

K199 copper CPU cooler
grease
insulator
grease
four TO247 fets, shiny side up
6-layer PCB
backing plate

The cooler, with springs, screws into the backing plate.

The function is a 200 watt ac/dc programmable dummy load.

Get some of these / like these 250 W 50 Ohm, cheap on ebay:
http://panteltje.com/pub/250W_1_GHz_dummy_load_IMG_4563.JPG

 

[server]

On Sun, 17 Jul 2022 16:44:07 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Sun, 17 Jul 2022 06:49:17 -0700) it happened
jlarkin@highlandsniptechnology.com wrote in
g248dhtjba7s0306mgnd1dp8o2cp5pvdjp@4ax.com>:

On Sun, 17 Jul 2022 18:09:51 +1000, Clifford Heath
no_spam@please.net> wrote:

On 14/7/22 07:32, John Larkin wrote:
http://ryceramic.ruixiangmc.com/ made this for us.
https://www.dropbox.com/sh/un3la6swtaa8d1c/AABaNXadReMeGCBk7mz6QdIta?dl=0
Nice work, great pricing. We are using a CPU cooler as a heat sink for
some big mosfets.

AlN conducts heat about as well as aluminum alloys.

How flat is it? I.e. how little contact grease can you get away with?

CH

I could measure that, but it is 1 mm thick and obviously polished very
flat. Our stack will be

K199 copper CPU cooler
grease
insulator
grease
four TO247 fets, shiny side up
6-layer PCB
backing plate

The cooler, with springs, screws into the backing plate.

The function is a 200 watt ac/dc programmable dummy load.

Get some of these / like these 250 W 50 Ohm, cheap on ebay:
http://panteltje.com/pub/250W_1_GHz_dummy_load_IMG_4563.JPG

I want programmable resistance or current loads, maybe even voltage
(zener) mode, over a wide range of currents and voltages. I have a
cool circuit that can do that.

We will even be able to program waveforms of resistance or current
load!