Path: Xl.tags.giganews.com!local-1.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Thu, 16 May 2024 16:48:10 +0000 From: John Larkin Newsgroups: sci.electronics.design Subject: Re: fast discrete PHEMT one-shot Date: Thu, 16 May 2024 09:46:16 -0700 Organization: Highland Tech Reply-To: xx@yy.com Message-ID: <9qdc4jdovsm0rousj88ngtn2bj6env9l48@4ax.com> References: <48na4j10neo6bru36kllgm3447dclcrfgg@4ax.com> X-Newsreader: Forte Agent 3.1/32.783 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 57 X-Trace: sv3-hD4l/poSIJbB9/uow159dfpgA7l6QdE4DTkovJur5Espm8ta7ebMFH369lTDRLlkk1dXPnKEyBKnhA7!+QeXeIdxDGcuTHzE2C6zVDkw6gO1k8U0kNqJOvnL+ygmflMwzg5Nb0uoNf89R+36Off/G3wjSZ7L!dsyq8w== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 3346 On Fri, 17 May 2024 00:40:32 +1000, Bill Sloman wrote: >On 16/05/2024 11:15 am, John Larkin wrote: >> On Wed, 15 May 2024 22:46:27 -0000 (UTC), piglet >> wrote: >> >>> John Larkin 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."