Sujet : Re: squeezing a field
De : bill.sloman (at) *nospam* ieee.org (Bill Sloman)
Groupes : sci.electronics.designDate : 26. Oct 2024, 02:13:54
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vfhfp0$3df88$2@dont-email.me>
References : 1 2 3 4 5 6 7 8 9 10 11
User-Agent : Mozilla Thunderbird
On 26/10/2024 3:32 am, Liz Tuddenham wrote:
Bill Sloman <bill.sloman@ieee.org> wrote:
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?
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It is for people who don't actually work with real parts.
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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.
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You youngsters probably don't remember a time when there wasn't Spice.
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Hey!!! Who are you calling a youngster?!!! :-)
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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.
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No surprise there, though I am a bit surprised that you would admit it
in public.
I don't understand why you use the word 'admit'. I make my own tools to
meet my particular requirements, there is nothing shameful about that.
There are more powerful tools out there. Audio doesn't necessarily need them, but John Larkin operates in a wider market, and there are tools he could use if he could be bothered to master them. His somewhat selective approach to the stuff he could have studied at Tulane might mean that he'd have to do quite a lot of work to master them.
I had to write my own multi-parameter non-linear least squares curve fitting program (in fortran 4) when I was an undergraduate. Since then I've used an off-the-shelf program when I need to do that kind of job.
-- Bill Sloman, Sydney
squeezing a field
Re: squeezing a field