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From: John Larkin <jjSNIPlarkin@highNONOlandtechnology.com>
Newsgroups: sci.electronics.design
Subject: Re: fast discrete PHEMT one-shot
Date: Thu, 16 May 2024 09:46:16 -0700
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On Fri, 17 May 2024 00:40:32 +1000, Bill Sloman <bill.sloman@ieee.org>
wrote:

>On 16/05/2024 11:15 am, John Larkin wrote:
>> On Wed, 15 May 2024 22:46:27 -0000 (UTC), piglet
>> <erichpwagner@hotmail.com> wrote:
>> 
>>> John Larkin <jjSNIPlarkin@highNONOlandtechnology.com> wrote:
>>>>
>>>> https://www.dropbox.com/scl/fi/agatzclr8pvr5470g6mc4/Phemt_One_Shot_1.jpg?rlkey=cwnx0qd7ajgnh8otf627x5lku&raw=1
>>>>
>>>> Regular monostables are terribly slow. This one has low prop delay and
>>>> high rep-rate, if the sim is to be believed.
>>>>
>>>> SAV541 is mostly specified as an RF part, but it's a dynamite switch.
>>>>
>>>> I can post a link to the files if anybody wants to play with this. All
>>>> my values are first guesses, no math involved, and it works!
>>>>
>>>> My SAV541 Spice model is a revision of Phil Hobbs' original.
>>>> Mini-Circuits is adamant that they will never provide Spice models, a
>>>> typical RF-bigot attitude.
>>>>
>>>>
>>>
>>> Yay! Eccles-Jordan ride again.
>> 
>> 1918!
>> 
>> I think that was a bistable. I don't know when the monostable was > invented.
>
>https://en.wikipedia.org/wiki/Multivibrator
>
>has a two quotes from 1942 one from 1943 and two from 1949 which make it 
>clear that monostable had been invented by then. It sees it as a cut 
>down bistable, so Eccles-Jordan is probably a good name.
>
>Since the first multivibrator circuit, the astable multivibrator 
>oscillator, was invented by Henri Abraham and Eugene Bloch during World 
>War I, it probably isn't the right name.
>
>https://apps.dtic.mil/sti/tr/pdf/AD0410225.pdf
>
>is a 1963 Ph.D. on the bistable circuit.
>
>> People tend to roll eyes when I use one-shots in logic designs. I
>> can't see why.
>
>You can't trigger a one-shot immediately after it has been triggered, 
>and the pulse width you get can be reduced if you re-trigger it too soon 
>after it has generated it's pulse, when it hasn't entirely recovered.

The SN74123 retriggerable one-shot, and a Fairchild equivalent, are
over 50 years old.

And "it's" is not the possessive form. It's means "it is."