• custom AlN insulator

    From John Larkin@21:1/5 to All on Wed Jul 13 14:32:56 2022
    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From whit3rd@21:1/5 to John Larkin on Wed Jul 13 18:06:17 2022
    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.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Larkin@21:1/5 to All on Thu Jul 14 11:49:56 2022
    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Clifford Heath@21:1/5 to John Larkin on Sun Jul 17 18:09:51 2022
    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From jlarkin@highlandsniptechnology.com@21:1/5 to no_spam@please.net on Sun Jul 17 06:49:17 2022
    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.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jan Panteltje@21:1/5 to jlarkin@highlandsniptechnology.com on Sun Jul 17 16:44:07 2022
    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From jlarkin@highlandsniptechnology.com@21:1/5 to pNaonStpealmtje@yahoo.com on Sun Jul 17 10:32:07 2022
    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!

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)