Re: squeezing a field

On 25/10/2024 7:56 am, 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.

Actually, it is extremely useful for people who work with real parts and who want to know exactly what is going on. You can see stuff that is very hard to measure on 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.

But he understood what he was measuring - a least most of the time.
His revolutionary ideas about capacitor microphones and the patent application he made fell down when he found out about the Philips capacitative pressure gauges which had been exploiting the same principle for about a decade before.
This played out in the pages of Wireless World, between the first and second parts of a two part article. I don't think he mentioned the Philips pressure gauges, but I've got a 1954 reference to them in my 1970 Ph.D. thesis. They might not have been the prior art that he found, but they would have served.
He was remarkably good, just not totally perfect.
His footnote reference to "squegging" in the 1959 class-D oscillator paper is another minor drop-off. He can't be blamed for it, but a super-hero might have done better.
--
Bill Sloman, Sydney