Re: heating a cap

On 8/10/2024 4:33 am, john larkin wrote:

On Sat, 05 Oct 2024 22:36:47 +0100, Cursitor Doom <cd@notformail.com>
wrote:

On Sat, 05 Oct 2024 11:41:23 -0700, john larkin <JL@gct.com> wrote:

On Sat, 05 Oct 2024 19:14:04 +0100, Cursitor Doom <cd@notformail.com>
wrote:

On Fri, 04 Oct 2024 22:15:50 -0700, john larkin <JL@gct.com> wrote:

On Fri, 04 Oct 2024 23:50:36 +0100, Cursitor Doom <cd@notformail.com>
wrote:

On Fri, 04 Oct 2024 10:31:13 -0700, john larkin <jl@glen--canyon.com>
wrote:

On Fri, 04 Oct 2024 12:10:38 -0400, legg <legg@nospam.magma.ca> wrote:

On Thu, 03 Oct 2024 16:36:24 -0700, john larkin <jl@glen--canyon.com>
wrote:

<snip>

Well, personally speaking,  I've derived a great deal of satisfaction
from doing so over the years.

>
Yes, especially when loud bangs and smoke are involved.
>
https://www.dropbox.com/scl/fi/oq1bgzkpsdcsmrg63w1r9/ExFets.jpg?rlkey=jcscvg5vt1qebgyxb0gt5575q&raw=1

>
Hmm. Electrolytics still give the best bang-per-buck. And the great
thing is, if they're old and fucked, they still give a great *bang* so
you don't need to waste costly new parts.

 It's new available parts that we want to test. Those were
switching-type mosfets used in kilowatt analog modes, in NMR gradient
coil drivers. We picked the best.
 Most switchmode fets really don't like to see much current and much
voltage simultaneously.

Lots of current at lots of volts is lots of watts being dissipated in the fet. Circuit designers generally try to avoid that.
In analog mode, you can't, and you need specialised devices that can dissipate a lot of power. John Larkin doesn't have that point of view - his "the best" is what is best at doing what he wants done.
--
Bill Sloman, Sydney