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guard ring?

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  guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-12 14:01 -0700
    Re: guard ring? TTman <kraken.sankey@gmail.com> - 2018-10-12 23:06 +0100
      Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-12 15:38 -0700
        Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-12 19:26 -0500
          Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-12 21:16 -0500
            Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-13 09:11 +0000
              Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-13 04:51 -0500
                Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-13 09:58 +0000
        Re: guard ring? George Herold <gherold@teachspin.com> - 2018-10-12 18:12 -0700
      Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-13 00:02 +0000
    Re: guard ring? <698839253X6D445TD@nospam.org> - 2018-10-13 06:59 +0000
    Re: guard ring? Robert Baer <robertbaer@localnet.com> - 2018-10-13 22:45 -0700
      Re: guard ring? John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-14 09:44 -0700
        Re: guard ring? John S <Sophi.2@invalid.org> - 2018-10-14 12:45 -0500
          Re: guard ring? krw@notreal.com - 2018-10-14 14:28 -0400
        Re: guard ring? Jasen Betts <jasen@xnet.co.nz> - 2018-10-14 19:28 +0000
          Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-14 20:57 +0000
            Re: guard ring? Jasen Betts <jasen@xnet.co.nz> - 2018-10-15 05:20 +0000
              Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-15 10:59 +0000
        Re: guard ring? "nuny@bid.nes" <alien8752@gmail.com> - 2018-10-14 17:39 -0700
    Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-14 14:56 -0700
      Re: guard ring? <698839253X6D445TD@nospam.org> - 2018-10-15 07:23 +0000
      Re: guard ring? <698839253X6D445TD@nospam.org> - 2018-10-15 07:54 +0000
        Re: guard ring? DecadentLinuxUserNumeroUno@decadence.org - 2018-10-15 11:21 +0000
          Re: guard ring? John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-15 07:52 -0700
    Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-16 10:31 -0700
      Re: guard ring? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-16 14:23 -0400
      Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-16 17:09 -0500
        Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-16 16:02 -0700
          Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-17 03:57 -0500
            Re: guard ring? John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-17 04:52 -0700
        Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-17 11:00 -0700
          Re: guard ring? Steve Wilson <9fe142ac@gmail.com> - 2018-10-17 12:13 -0700
          Re: guard ring? Steve Wilson <9fe142ac@gmail.com> - 2018-10-17 12:19 -0700
            Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-17 12:39 -0700
          Re: guard ring? Jasen Betts <jasen@xnet.co.nz> - 2018-10-17 19:15 +0000
          Re: guard ring? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-17 15:33 -0400
            Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-17 12:56 -0700
              Re: guard ring? John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-17 13:15 -0700
          Re: guard ring? "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-17 16:34 -0500

Page 1 of 2  [1] 2  Next page →

#519093 — guard ring?

I'm still iterating on my high-voltage pulse generator. Rev C looks
very good. I've been pushing it up voltage and frequency (like, 1200
volts and 4 MHz) and seeing what parts fry, and working on them.

I have a dpak schottky diode in a sort of snubber place. According to
Spice, it shouldn't get too hot, and it's soldered to all sorts of
copper pours and thermal vias and stuff. It's an SBRD10200 and it's
frying. I happened to have some smaller, lower current diodes around,
UPS5100E3, which is a sawed-off sub-dpak thing. I figured I might
squeeze in two of those in parallel... but just one runs cool. 

https://www.dropbox.com/s/6zv36c4d6v7dsbn/Two_Diodes.JPG?raw=1

Weird. I'm guessing that the big one has a p-n guard ring that makes
it have reverse recovery current right after a big forward current
spike. Data sheets never talk about that.

I heat sinked things too well, so it's a bear to desolder/resolder.

https://www.dropbox.com/s/bg0399wzzi4k3ze/T850C_D1_Kluge.jpg?raw=1


-- 

John Larkin         Highland Technology, Inc
picosecond timing   precision measurement 

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

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#519096

On 12-Oct-18 10:01 PM, John Larkin wrote:
> 
> 
> I'm still iterating on my high-voltage pulse generator. Rev C looks
> very good. I've been pushing it up voltage and frequency (like, 1200
> volts and 4 MHz) and seeing what parts fry, and working on them.
> 
> I have a dpak schottky diode in a sort of snubber place. According to
> Spice, it shouldn't get too hot, and it's soldered to all sorts of
> copper pours and thermal vias and stuff. It's an SBRD10200 and it's
> frying. I happened to have some smaller, lower current diodes around,
> UPS5100E3, which is a sawed-off sub-dpak thing. I figured I might
> squeeze in two of those in parallel... but just one runs cool.
> 
> https://www.dropbox.com/s/6zv36c4d6v7dsbn/Two_Diodes.JPG?raw=1
> 
> Weird. I'm guessing that the big one has a p-n guard ring that makes
> it have reverse recovery current right after a big forward current
> spike. Data sheets never talk about that.
> 
> I heat sinked things too well, so it's a bear to desolder/resolder.

Heat gun/ + heat pad under...

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

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#519100

On Fri, 12 Oct 2018 23:06:07 +0100, TTman <kraken.sankey@gmail.com>
wrote:

>On 12-Oct-18 10:01 PM, John Larkin wrote:
>> 
>> 
>> I'm still iterating on my high-voltage pulse generator. Rev C looks
>> very good. I've been pushing it up voltage and frequency (like, 1200
>> volts and 4 MHz) and seeing what parts fry, and working on them.
>> 
>> I have a dpak schottky diode in a sort of snubber place. According to
>> Spice, it shouldn't get too hot, and it's soldered to all sorts of
>> copper pours and thermal vias and stuff. It's an SBRD10200 and it's
>> frying. I happened to have some smaller, lower current diodes around,
>> UPS5100E3, which is a sawed-off sub-dpak thing. I figured I might
>> squeeze in two of those in parallel... but just one runs cool.
>> 
>> https://www.dropbox.com/s/6zv36c4d6v7dsbn/Two_Diodes.JPG?raw=1
>> 
>> Weird. I'm guessing that the big one has a p-n guard ring that makes
>> it have reverse recovery current right after a big forward current
>> spike. Data sheets never talk about that.
>> 
>> I heat sinked things too well, so it's a bear to desolder/resolder.
>
>Heat gun/ + heat pad under...

I don't want to melt everything else, and there's stuff on the back
side of the board, too. My manufacturing people could do it for me,
but they're busy. I applied my biggest Metcal tip and waited about 5
minutes for the big diode to finally let loose. I suspect that the
solder didn't fully flow under the new tiny diode, but it runs cool.

Anyhow, that's a cute little schottky without a guard ring problem.


-- 

John Larkin         Highland Technology, Inc
picosecond timing   precision measurement 

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

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#519109

"John Larkin" <jjlarkin@highland_snip_technology.com> wrote in message 
news:b782sdhv8gtok4b8br9pjpik68m6rf15qt@4ax.com...
>>Heat gun/ + heat pad under...
>
> I don't want to melt everything else, and there's stuff on the back
> side of the board, too. My manufacturing people could do it for me,
> but they're busy. I applied my biggest Metcal tip and waited about 5
> minutes for the big diode to finally let loose. I suspect that the
> solder didn't fully flow under the new tiny diode, but it runs cool.



> Anyhow, that's a cute little schottky without a guard ring problem.
>

Schottky can be pretty bad for snubbing, depending.  The peak current can 
hit the guard ring diodes and you get big recovery loss.  The capacitance is 
huge.

You'd have to add a shunt to be sure what was going on with the other one.

Regular diodes can have faster recovery than schottky-guard-ring recovery, 
but they also cost forward as well as reverse recovery.

Tim

-- 
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Design
Website: https://www.seventransistorlabs.com/ 

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#519120

> "John Larkin" <jjlarkin@highland_snip_technology.com> wrote in message 
> news:b782sdhv8gtok4b8br9pjpik68m6rf15qt@4ax.com...
>>>Heat gun/ + heat pad under...
>>
>> I don't want to melt everything else, and there's stuff on the back
>> side of the board, too. My manufacturing people could do it for me,
>> but they're busy. I applied my biggest Metcal tip and waited about 5
>> minutes for the big diode to finally let loose. I suspect that the
>> solder didn't fully flow under the new tiny diode, but it runs cool.
>

Hot air machines are super cheap, and don't melt anything but what they're 
pointed at.  Assuming the only thing melting is solder.  You probably 
shouldn't have melty things like electrolytics and film caps nearby on an 
SMT board, anyway, but a heat shield (aluminum foil) keeps that feasible.

Tim

-- 
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Design
Website: https://www.seventransistorlabs.com/ 

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#519142

"Tim Williams" <tiwill@seventransistorlabs.com> wrote in
news:pprker$6d5$1@dont-email.me: 

> Hot air machines are super cheap, and don't melt anything but what
> they're pointed at.  Assuming the only thing melting is solder. 

With PCBs that have heavy via and high via counts near heavy parts even a 
single hot air jet can be detrimental to a board.

  Bringing the entire assembly up in temperature OVER ambient means less 
thermal WORK has to be done to do the job, AND less overall stress occuurs 
on the whole thing.

  One brings the entire assembly temp up (at least the area surrounding the 
rework location), THEN use a direct hot air jet to reflow the part.

  They have benchtop setups for this.

http://www.zeph.com/

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#519148

<DecadentLinuxUserNumeroUno@decadence.org> wrote in message 
news:ppscr9$145q$1@gioia.aioe.org...
> "Tim Williams" <tiwill@seventransistorlabs.com> wrote in
> news:pprker$6d5$1@dont-email.me:
>
>> Hot air machines are super cheap, and don't melt anything but what
>> they're pointed at.  Assuming the only thing melting is solder.
>
> With PCBs that have heavy via and high via counts near heavy parts even a
> single hot air jet can be detrimental to a board.

Well, you set it too high then (somewhere north of 260C).

And yeah, if you have too much thermal mass for this to work, you need a 
preheater.

Tim

-- 
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Design
Website: https://www.seventransistorlabs.com/ 

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#519149

"Tim Williams" <tiwill@seventransistorlabs.com> wrote in news:ppsf6u$970$1
@dont-email.me:

> And yeah, if you have too much thermal mass for this to work, you need a 
> preheater.
> 

That was his entire beef.  Hard to desolder...  preheat was the suggestion 
a couple of us gave.

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#519116

On Friday, October 12, 2018 at 6:38:33 PM UTC-4, John Larkin wrote:
> On Fri, 12 Oct 2018 23:06:07 +0100, TTman <kraken.sankey@gmail.com>
> wrote:
> 
> >On 12-Oct-18 10:01 PM, John Larkin wrote:
> >> 
> >> 
> >> I'm still iterating on my high-voltage pulse generator. Rev C looks
> >> very good. I've been pushing it up voltage and frequency (like, 1200
> >> volts and 4 MHz) and seeing what parts fry, and working on them.
> >> 
> >> I have a dpak schottky diode in a sort of snubber place. According to
> >> Spice, it shouldn't get too hot, and it's soldered to all sorts of
> >> copper pours and thermal vias and stuff. It's an SBRD10200 and it's
> >> frying. I happened to have some smaller, lower current diodes around,
> >> UPS5100E3, which is a sawed-off sub-dpak thing. I figured I might
> >> squeeze in two of those in parallel... but just one runs cool.
> >> 
> >> https://www.dropbox.com/s/6zv36c4d6v7dsbn/Two_Diodes.JPG?raw=1
> >> 
> >> Weird. I'm guessing that the big one has a p-n guard ring that makes
> >> it have reverse recovery current right after a big forward current
> >> spike. Data sheets never talk about that.
> >> 
> >> I heat sinked things too well, so it's a bear to desolder/resolder.
> >
> >Heat gun/ + heat pad under...
> 
> I don't want to melt everything else, and there's stuff on the back
> side of the board, too. My manufacturing people could do it for me,
> but they're busy. I applied my biggest Metcal tip and waited about 5
> minutes for the big diode to finally let loose. I suspect that the
> solder didn't fully flow under the new tiny diode, but it runs cool.
I was going to suggest a good size iron, and solder sucker.  
Then an exacto, under the tab.   

5 min is much too long.

George H.   
> 
> Anyhow, that's a cute little schottky without a guard ring problem.
> 
> 
> -- 
> 
> John Larkin         Highland Technology, Inc
> picosecond timing   precision measurement 
> 
> jlarkin att highlandtechnology dott com
> http://www.highlandtechnology.com

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#519105

TTman <kraken.sankey@gmail.com> wrote in news:ppr5sh$3mq$1@dont-email.me:

> On 12-Oct-18 10:01 PM, John Larkin wrote:
>> 
snip
>> 
>> I heat sinked things too well, so it's a bear to desolder/resolder.
> 
> Heat gun/ + heat pad under...
> 
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
> 
> 

  I agree.  Even a chamber is a good idea.  Bring the assembly UP in 
temperature so that the transition to reflow the part is less of a jump.

  It is easier to desolder a part that is already sitting at 200°C when one 
starts adding the reflow heat source (hot air, etc.).  A 200 degree 
transition on a hot part is far easier to impart than a 330 degree jump 
from ambient.

[toc] | [prev] | [next] | [standalone]

#519137

John Larkin wrote
>I'm still iterating on my high-voltage pulse generator. Rev C looks
>very good. I've been pushing it up voltage and frequency (like, 1200
>volts and 4 MHz) and seeing what parts fry, and working on them.
>
>I have a dpak schottky diode in a sort of snubber place. According to
>Spice, it shouldn't get too hot, and it's soldered to all sorts of
>copper pours and thermal vias and stuff. It's an SBRD10200 and it's
>frying. I happened to have some smaller, lower current diodes around,
>UPS5100E3, which is a sawed-off sub-dpak thing. I figured I might
>squeeze in two of those in parallel... but just one runs cool. 
>
>https://www.dropbox.com/s/6zv36c4d6v7dsbn/Two_Diodes.JPG?raw=1
>
>Weird. I'm guessing that the big one has a p-n guard ring that makes
>it have reverse recovery current right after a big forward current
>spike. Data sheets never talk about that.
>
>I heat sinked things too well, so it's a bear to desolder/resolder.
>
>https://www.dropbox.com/s/bg0399wzzi4k3ze/T850C_D1_Kluge.jpg?raw=1

4 MHz at 1000V, I did higher frequencies with tubes in the sixties,
with 1000V supply at .5 A peak.
Without seeing the circuit it is hard to tell, but Schottky diodes
would not be my choice, there are nice fast si diodes or at least there were.
Schottkys leak, get very hot because current flows both directions that way.
Thermal runaway results.
A few pF from a fast si diode .. helps tune the circuit ;-)

Anyways no way to tell without seeing what that diode is doing.
 
Snubber = flyback diode here?

[toc] | [prev] | [next] | [standalone]

#519233

John Larkin wrote:
> 
> 
> I'm still iterating on my high-voltage pulse generator. Rev C looks
> very good. I've been pushing it up voltage and frequency (like, 1200
> volts and 4 MHz) and seeing what parts fry, and working on them.
> 
> I have a dpak schottky diode in a sort of snubber place. According to
> Spice, it shouldn't get too hot, and it's soldered to all sorts of
> copper pours and thermal vias and stuff. It's an SBRD10200 and it's
> frying. I happened to have some smaller, lower current diodes around,
> UPS5100E3, which is a sawed-off sub-dpak thing. I figured I might
> squeeze in two of those in parallel... but just one runs cool.
> 
> https://www.dropbox.com/s/6zv36c4d6v7dsbn/Two_Diodes.JPG?raw=1
> 
> Weird. I'm guessing that the big one has a p-n guard ring that makes
> it have reverse recovery current right after a big forward current
> spike. Data sheets never talk about that.
> 
> I heat sinked things too well, so it's a bear to desolder/resolder.
> 
> https://www.dropbox.com/s/bg0399wzzi4k3ze/T850C_D1_Kluge.jpg?raw=1
Error (500)
Something went wrong. Don't worry, your files are still safe and the 
Dropboxers have been notified. Check out our Help Center and forums for 
help, or head back to home.
> 
> 

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#519252

On Sat, 13 Oct 2018 22:45:41 -0700, Robert Baer
<robertbaer@localnet.com> wrote:

>John Larkin wrote:
>> 
>> 
>> I'm still iterating on my high-voltage pulse generator. Rev C looks
>> very good. I've been pushing it up voltage and frequency (like, 1200
>> volts and 4 MHz) and seeing what parts fry, and working on them.
>> 
>> I have a dpak schottky diode in a sort of snubber place. According to
>> Spice, it shouldn't get too hot, and it's soldered to all sorts of
>> copper pours and thermal vias and stuff. It's an SBRD10200 and it's
>> frying. I happened to have some smaller, lower current diodes around,
>> UPS5100E3, which is a sawed-off sub-dpak thing. I figured I might
>> squeeze in two of those in parallel... but just one runs cool.
>> 
>> https://www.dropbox.com/s/6zv36c4d6v7dsbn/Two_Diodes.JPG?raw=1
>> 
>> Weird. I'm guessing that the big one has a p-n guard ring that makes
>> it have reverse recovery current right after a big forward current
>> spike. Data sheets never talk about that.
>> 
>> I heat sinked things too well, so it's a bear to desolder/resolder.
>> 
>> https://www.dropbox.com/s/bg0399wzzi4k3ze/T850C_D1_Kluge.jpg?raw=1
>Error (500)
>Something went wrong. Don't worry, your files are still safe and the 
>Dropboxers have been notified. Check out our Help Center and forums for 
>help, or head back to home.

Looks fine to me. Anybody else having problems seeing my links?

Some companies don't allow their employees to see Dropbox, or to
receive verious email attatchments.


-- 

John Larkin         Highland Technology, Inc

lunatic fringe electronics 

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#519254

On 10/14/2018 11:44 AM, John Larkin wrote:
> On Sat, 13 Oct 2018 22:45:41 -0700, Robert Baer
> <robertbaer@localnet.com> wrote:
> 
>> John Larkin wrote:
>>>
>>>
>>> I'm still iterating on my high-voltage pulse generator. Rev C looks
>>> very good. I've been pushing it up voltage and frequency (like, 1200
>>> volts and 4 MHz) and seeing what parts fry, and working on them.
>>>
>>> I have a dpak schottky diode in a sort of snubber place. According to
>>> Spice, it shouldn't get too hot, and it's soldered to all sorts of
>>> copper pours and thermal vias and stuff. It's an SBRD10200 and it's
>>> frying. I happened to have some smaller, lower current diodes around,
>>> UPS5100E3, which is a sawed-off sub-dpak thing. I figured I might
>>> squeeze in two of those in parallel... but just one runs cool.
>>>
>>> https://www.dropbox.com/s/6zv36c4d6v7dsbn/Two_Diodes.JPG?raw=1
>>>
>>> Weird. I'm guessing that the big one has a p-n guard ring that makes
>>> it have reverse recovery current right after a big forward current
>>> spike. Data sheets never talk about that.
>>>
>>> I heat sinked things too well, so it's a bear to desolder/resolder.
>>>
>>> https://www.dropbox.com/s/bg0399wzzi4k3ze/T850C_D1_Kluge.jpg?raw=1
>> Error (500)
>> Something went wrong. Don't worry, your files are still safe and the
>> Dropboxers have been notified. Check out our Help Center and forums for
>> help, or head back to home.
> 
> Looks fine to me. Anybody else having problems seeing my links?
> 
> Some companies don't allow their employees to see Dropbox, or to
> receive verious email attatchments.

No problem at all here. Nice photos.

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#519259

On Sun, 14 Oct 2018 12:45:49 -0500, John S <Sophi.2@invalid.org>
wrote:

>On 10/14/2018 11:44 AM, John Larkin wrote:
>> On Sat, 13 Oct 2018 22:45:41 -0700, Robert Baer
>> <robertbaer@localnet.com> wrote:
>> 
>>> John Larkin wrote:
>>>>
>>>>
>>>> I'm still iterating on my high-voltage pulse generator. Rev C looks
>>>> very good. I've been pushing it up voltage and frequency (like, 1200
>>>> volts and 4 MHz) and seeing what parts fry, and working on them.
>>>>
>>>> I have a dpak schottky diode in a sort of snubber place. According to
>>>> Spice, it shouldn't get too hot, and it's soldered to all sorts of
>>>> copper pours and thermal vias and stuff. It's an SBRD10200 and it's
>>>> frying. I happened to have some smaller, lower current diodes around,
>>>> UPS5100E3, which is a sawed-off sub-dpak thing. I figured I might
>>>> squeeze in two of those in parallel... but just one runs cool.
>>>>
>>>> https://www.dropbox.com/s/6zv36c4d6v7dsbn/Two_Diodes.JPG?raw=1
>>>>
>>>> Weird. I'm guessing that the big one has a p-n guard ring that makes
>>>> it have reverse recovery current right after a big forward current
>>>> spike. Data sheets never talk about that.
>>>>
>>>> I heat sinked things too well, so it's a bear to desolder/resolder.
>>>>
>>>> https://www.dropbox.com/s/bg0399wzzi4k3ze/T850C_D1_Kluge.jpg?raw=1
>>> Error (500)
>>> Something went wrong. Don't worry, your files are still safe and the
>>> Dropboxers have been notified. Check out our Help Center and forums for
>>> help, or head back to home.
>> 
>> Looks fine to me. Anybody else having problems seeing my links?
>> 
>> Some companies don't allow their employees to see Dropbox, or to
>> receive verious email attatchments.
>
>No problem at all here. Nice photos.
>
Same here.  No problems.

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#519264

On 2018-10-14, John Larkin <jjlarkin@highlandtechnology.com> wrote:
> On Sat, 13 Oct 2018 22:45:41 -0700, Robert Baer
><robertbaer@localnet.com> wrote:

>>> https://www.dropbox.com/s/6zv36c4d6v7dsbn/Two_Diodes.JPG?raw=1

>>> https://www.dropbox.com/s/bg0399wzzi4k3ze/T850C_D1_Kluge.jpg?raw=1

>>Error (500)
>>Something went wrong. Don't worry, your files are still safe and the 
>>Dropboxers have been notified. Check out our Help Center and forums for 
>>help, or head back to home.
>
> Looks fine to me. Anybody else having problems seeing my links?

Sometimes they don't work.  Retrying later usually works.  Those are
working now.

-- 
  Notsodium is mined on the banks of denial.

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#519271

Jasen Betts <jasen@xnet.co.nz> wrote in news:pq05cm$lfo$1@gonzo.alcatraz:

> Sometimes they don't work.  Retrying later usually works.  Those are
> working now.
> 

Are you still on a POTS connection and a modem somewhere in backwoods 
hellville?

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#519325

On 2018-10-14, DecadentLinuxUserNumeroUno@decadence.org <DecadentLinuxUserNumeroUno@decadence.org> wrote:
> Jasen Betts <jasen@xnet.co.nz> wrote in news:pq05cm$lfo$1@gonzo.alcatraz:
>
>> Sometimes they don't work.  Retrying later usually works.  Those are
>> working now.
>> 
>
> Are you still on a POTS connection and a modem somewhere in backwoods 
> hellville?

No. And how the fuck would a POTS connection cause dropbox to fail
anyway?  sometimes drop box is drop ball.


-- 
  Notsodium is mined on the banks of denial.

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#519347

Jasen Betts <jasen@xnet.co.nz> wrote in news:pq183r$40d$2@gonzo.alcatraz:

> 
> No. And how the fuck would a POTS connection cause dropbox to fail
> anyway?  sometimes drop box is drop ball.
> 
> 

  Fail?  No.  But folks like you get impatient and start pointing fingers.

  So, POTS didn't do it...  an impatient blametard did.

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#519292

On Sunday, October 14, 2018 at 9:44:25 AM UTC-7, John Larkin wrote:
> On Sat, 13 Oct 2018 22:45:41 -0700, Robert Baer
> <robertbaer@localnet.com> wrote:
> 
> >John Larkin wrote:
> >> 
> >> 
> >> I'm still iterating on my high-voltage pulse generator. Rev C looks
> >> very good. I've been pushing it up voltage and frequency (like, 1200
> >> volts and 4 MHz) and seeing what parts fry, and working on them.
> >> 
> >> I have a dpak schottky diode in a sort of snubber place. According to
> >> Spice, it shouldn't get too hot, and it's soldered to all sorts of
> >> copper pours and thermal vias and stuff. It's an SBRD10200 and it's
> >> frying. I happened to have some smaller, lower current diodes around,
> >> UPS5100E3, which is a sawed-off sub-dpak thing. I figured I might
> >> squeeze in two of those in parallel... but just one runs cool.
> >> 
> >> https://www.dropbox.com/s/6zv36c4d6v7dsbn/Two_Diodes.JPG?raw=1
> >> 
> >> Weird. I'm guessing that the big one has a p-n guard ring that makes
> >> it have reverse recovery current right after a big forward current
> >> spike. Data sheets never talk about that.
> >> 
> >> I heat sinked things too well, so it's a bear to desolder/resolder.

  Dremel?

> >> https://www.dropbox.com/s/bg0399wzzi4k3ze/T850C_D1_Kluge.jpg?raw=1
> >Error (500)
> >Something went wrong. Don't worry, your files are still safe and the 
> >Dropboxers have been notified. Check out our Help Center and forums for 
> >help, or head back to home.
> 
> Looks fine to me. Anybody else having problems seeing my links?

  Might have been the Great Internet Reset:

https://www.networkworld.com/article/3313341/internet/icanns-internet-dns-security-upgrade-apparently-goes-off-without-a-glitch.html

  It was announced that some ISPs might have issues.


  Mark L. Fergerson

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