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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: another fast one-shot
Date: Sun, 23 Jun 2024 11:38:28 +1000
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On 22/06/2024 3:23 pm, john larkin wrote:
> On Fri, 14 Jun 2024 19:02:11 +0100, piglet <erichpwagner@hotmail.com>
> wrote:
> 
>> On 13/06/2024 07:03, Bill Sloman wrote:
>>> On 13/06/2024 4:11 am, john larkin wrote:
>>>> On Wed, 12 Jun 2024 17:22:49 -0000 (UTC), Cursitor Doom
>>>> <cd999666@notformail.com> wrote:
>>>>
>>>>> On Wed, 12 Jun 2024 09:33:17 -0700, john larkin wrote:


<snip>

> It's really a slow diffamp, not a one-shot. It will make a nice clean
> 1 second output, given a 1 second trigger input.

It isn't. John could have tried to simulate his "one second trigger 
input", if he could have worked out what he meant by that.

And it is hard to make a really slow differential amplifier out of a 
BFR92  long-tailed pair.

He got very excited about the 43mV threshold voltage. Just for fun, I 
increased R7 in my simulation from 1k2 to 1k5, which doubles the threshold.

The same trigger pulse gave a visually identical output pulse. My guess 
is that it will be picoseconds later and picoseconds narrower, but I'm 
not going to make a meal of it by actually measuring the differences.

-- 
Bill Sloman, Sydney


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