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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: fast discrete PHEMT one-shot
Date: Fri, 17 May 2024 15:37:13 +1000
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On 17/05/2024 2:46 am, John Larkin wrote:
> 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.

But you don't get a new pulse when you retrigger a retriggerable 
monostable - you just stretch the one you had already started.

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

I do  know that but produce the mistake as a typo from time to time, as 
you are well aware.

And you've snipped the rest of my post, without marking the snip.

-- 
Bill Sloman, Sydney