Re: [EE] solid aluminum caps on 60hz

BCCs: Re Prof Bogle.

On Thu, 15 May 2025 at 20:04, Sean Breheny <[email protected]> wrote:

> Hi Russell, Interesting datapoint - in my work on the EMC book, I did
> experiments on
> RFI from ordinary rectifiers. I was unable to generate any! I was able to
> make big reverse recovery spikes but the dI/dt was too slow to produce
> harmonics high enough to be radiated to any significant degree with
> reasonable wire lengths. I had heard of this problem before but not
> actually experienced it in line-frequency devices. Have you seen it "in the
> wild"?
>

Sean (Sadly :-) ) I have not seen it happen myself.
Memory says that I have heard of it happening but, as said memory now
covers 60+years of playing, details may have been lost, or fabricated :-).

However, it must be true :-) - the very great Professor A G Bogle told us
so in about 1971.
He founded the Auckland University Electrical Engineering department in
1969.

" ... Professor Bogle, renowned for both his imposing intellect and his
physical stature, completed his Bachelor of Electrical Engineering in 1935
and a Bachelor of Mechanical Engineering the following year.

He won a Rhodes Scholarship in 1937 and was accepted at Oriel College,
Oxford. At Oxford, he worked towards a DPhil until the outbreak of World
War II *when he joined the Admiralty team engaged in the development of
radar systems*. He completed his doctorate at the Admiralty. ..."

From:
https://www.nzherald.co.nz/nz/emobituaryem-archibald-gordon-bogle/XDJD2NVWONSLSUJYH7SG45B25Q/#google_vignette

Much more material:
I could just maybe be in the photo on page 17(lecture theatre), but
probably not.
https://www.donovanimages.co.nz/media/projects/Vivat_low-res.pdf


    Russell