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Design help / ideas current sensor (2023 Update)

The John Doe troll stated the following in message-id <sdhn7c$pkp$ snipped-for-privacy@dont-email.me:

And the John Doe troll stated the following in message-id <sg3kr7$qt5$ snipped-for-privacy@dont-email.me:

NOBODY likes the John Doe troll's contentless spam.

And yet, the clueless John Doe troll has continued to post incorrectly formatted USENET articles that are devoid of content (latest example on Thu, 6 Jan 2022 03:32:20 -0000 (UTC) in message-id <sr5ns4$etm$ snipped-for-privacy@dont-email.me).

This posting is a public service announcement for any google groups readers who happen by to point out that the John Doe troll does not even follow the rules it uses to troll other posters.

DEcDsyku2ILF

Reply to
Edward Hernandez
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snipped-for-privacy@highlandsniptechnology.com wrote: ==================================

** Long time back I was offered a contract to design a small SMPS - not my specialty. The spec was rather vague: 240VAC input, 5VDC out at 1amp and 0-120 VDC variable at 1amp. The 120VDC to be controlled by a variable 0-5V input.

I wanted a lot more detail OR simply be informed what the task was so I could determine the missing parameters. Got stone walled, no more info was forth coming and payment would only be on presentation of a working, usable prototype plus full documentation. This seemed very unprofessional to me so I pulled out.

Later info from the "middle man" involved was that it was some kind of medical device. WTF !!!

...... Phil

Reply to
Phil Allison

Hi Mkr the thing that stood out to me is you want to sense " the output of an amateur radio xmtr when it's on the air." and that means knowing that normal RF signal output is being fed to the antenna. Anything else, is just an indirect indication. Say, there was a short or other problem that mimicked the appearance of normal operation, an indirect sensing method would be fooled.

I seem to recall many years ago, a hobbyist magazine project about stealing a little signal that leaked out from imperfect shield of the coax cable. The pickup was a wire wrapped around the outside of the coax. One end, fed into diode+sensitive transistor stage, and on to panel meter.

Unless you're using super-high shielded coax, I think it might work.... cheers, RS

Reply to
Rich S

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