Re: squeezing a field

On Fri, 25 Oct 2024 09:37:19 +0100, liz@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:

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

 
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.

I wrote a PowerBasic program to find resistors in stock that can hit a
target divider ratio and Thevenin impedance. That's in PowerBasic.

It saves a lot of time and helps minimize the number of BOM items.

I love Basic, but the code snobs hate it.

I wrote some other apps, like resonance calculators, filter design,
unit conversions. I could post a link.

I also have scribbles about what can be done with one quad resistor
pack.