Re: squeezing a field

Liz Tuddenham <liz@poppyrecords.invalid.invalid> wrote:

john larkin <jl@glen--canyon.com> wrote:
 

On Fri, 25 Oct 2024 17:32:21 +0100, liz@poppyrecords.invalid.invalid
(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?

 
 

 
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.

 
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.

 
You have been admonished by Sloman. Confess your errors and beg
forgiveness.

 
My reply to that had anatomical connotations.     :-)
 
 

Have you used LT Spice? It's easy to learn and is great fun. I(t makes
time for snacking and napping too.

 
I don't think they ever did a version that would run on a Mac G3 (OS
8.6), which is my main workhorse.
 
 

I’ve been running LTspice using Wine on Linux for 15 years or so, no
problems.  Wine runs fine on both x86 and apple silicon, I’m told.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics