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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: squeezing a field
Date: Fri, 25 Oct 2024 23:42:52 +1100
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On 25/10/2024 7:37 pm, Liz Tuddenham wrote:
> john larkin <jl@glen--canyon.com> wrote:
> 
>> On Thu, 24 Oct 2024 21:56:59 +0100, liz@poppyrecords.invalid.invalid
>> (Liz Tuddenham) wrote:
>>
>>> john larkin <jl@glen--canyon.com> wrote:
>>>
>>>> On Thu, 24 Oct 2024 18:45:20 +0200, Lasse Langwadt <llc@fonz.dk>
>>>> wrote:
>>> [...]
>>>>> plugging numbers pulled out of thin air into LTSpice is better that
>>>>> doing the actual measurement?
>>>
>>>
>>>>
>>>> It is for people who don't actually work with real parts.
>>>
>>>
>>> Peter Baxandall (of tone control and QUAD amplifier fame) claimed to use
>>> analogue computing to work out his designs  i.e. He built prototypes and
>>> measured them.
>>
>> You youngsters probably don't remember a time when there wasn't Spice.
> 
> Hey!!!   Who are you calling a youngster?!!!      :-)
> 
>> I did some simulation in Basic-Plus, and it was a nuisance. My first
>> PC sim program was Tatum labs ECA, which required a typed netlist. But
>> it was pretty cool.
> 
> I have a spreadsheet I wrote for calculating the relationships between
> resistance, capacitance, frequency and time constant (put in two and the
> others appear, put in three and the error% appears).   It also gives dB
> loss below or above the 'cutoff' frequency.  Some years ago I also made
> some lookup tables for combinations of 5% tolerance resistors in series
> and parallel.
> 
> Those and a pocket calculator are still the only 'computing' I use for
> design work.

No surprise there, though I am a bit surprised that you would admit it 
in public.

-- 
Bill Sloman, Sydney