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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: another fast one-shot
Date: Sun, 23 Jun 2024 10:36:35 -0700
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On Sun, 23 Jun 2024 17:01:45 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:

>On Sun, 23 Jun 2024 11:38:28 +1000, Bill Sloman wrote:
>
>> 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
>
>When I needed a design for a fast pulse generator, Jim Thompson very 
>kindly came up with the goods for me and was happy to do it for free. Jim 
>designed quite a lot of bits and pieces for me over the years. He was a 
>*genuine* contributor in the true spirit of mutual assistance that the 
>'net used to be all about. You could learn a thing or two from Jim's 
>exemplary conduct here, Bill. Stop being a condescending wanker and chip-
>in something useful for a change.

There are some screamong fast CMOS gates and flops around that cost
pennies.