Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: LEDs, drama
Date: Mon, 5 May 2025 21:12:33 +1000
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On 5/05/2025 3:28 am, Cursitor Doom wrote:
> On Sun, 04 May 2025 06:56:23 -0700, john larkin <jl@glen--canyon.com>
> wrote:
> 
>> On Sun, 04 May 2025 12:18:12 +0100, Cursitor Doom <cd@notformail.com>
>> wrote:
>>
>>> On Fri, 02 May 2025 08:10:44 -0700, john larkin <jl@glen--canyon.com>
>>> wrote:
>>>
>>>>
>>>>
>>>> One of my young engineers just got the first unit of a thing he
>>>> designed. He was all cautious about bringing it up a step at a time,
>>>> so I just pulled rank and switched it on in self-trigger mode. It
>>>> works.
>>>>
>>>> https://www.dropbox.com/scl/fi/wl51ennrq60edw9ina3za/P800-1Hz-Selft-Trigger.mp4?rlkey=ravaj03c330jjfmplylxr2k7j&dl=0
>>>>
>>>> It's an 8-channel high voltage pulse generator. We're not sure what
>>>> it's used for and the customer won't tell.
>>>
>>> Could be for the timing capacitors in a fusion bomb. I really wouldn't
>>> worry about it.
>>
>> I've done timing to fire implosion fission bombs, and this doesn't
>> look to be one of those.
> 
> Yes, I said *fusion* bomb which is somewhat different. Timing is
> critical for those. It's rather like grasping a wet bar of soap.

"Fusion" bombs are wrapped around a fission bomb, typically an implosion 
device. I haven't clue what the fusible layer is - Wikipedia says 
lithium deutride - and a tamper layer is wrapped around that. If the 
tamper layer is made of uranium you get a very dirty 
fission-fusion-fission bomb. The only interesting timing involved is in 
getting the shell of explosives to go off all at once so that you get 
your symmetrical implosion to compress the inner core of plutonium.

The fisson bomb is different from an implosion fission bomb, but only in 
structure - the timing problem is exactly the same.

<snip>

-- 
Bill Sloman, Sydney