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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: another fast one-shot
Date: Mon, 24 Jun 2024 12:10:10 +1000
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On 24/06/2024 3:01 am, Cursitor Doom 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.
> 
> 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.

Pointed you at the right application note? Most of the work in doing 
that is finding out what you actually wanted to do.

> 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. 

He was a contract integrated circuit designer, and got paid for anything 
serious. At one point he claimed that he had denounced me to the FBI for 
being "dangerously anti-American". That "true spirit of mutual 
assistance" came with a certain amount of unpleasant baggage.

> 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.

Just like you do?

-- 
Bill Sloman, Sydney

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