Re: OT: Covid's True Origins

On 24/04/2025 12:38 am, john larkin wrote:

On Wed, 23 Apr 2025 11:56:39 +0100, Cursitor Doom <cd@notformail.com>
wrote:
 

On Tue, 22 Apr 2025 16:29:22 -0700, john larkin <jl@glen--canyon.com>
wrote:
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On Tue, 22 Apr 2025 15:15:01 -0700, john larkin <jl@glen--canyon.com>
wrote:
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On Tue, 22 Apr 2025 22:02:32 +0100, Cursitor Doom <cd@notformail.com>
wrote:
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On Mon, 21 Apr 2025 15:02:17 -0700, john larkin <jl@glen--canyon.com>
wrote:
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On Mon, 21 Apr 2025 22:23:03 +0100, Cursitor Doom <cd@notformail.com>
wrote:
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On Mon, 21 Apr 2025 08:26:40 -0700, john larkin <jl@glen--canyon.com>
wrote:

<snip>

The RF boys always chop off their graphs to hide the bad bits. And a
lot of parts are sold to work in some specific band, with tuned wire
bonds or whatever, so wideband use is guesswork.

Not so much guesswork as demanding of insight. If you haven't got any insight into how the thing works in its usual application, then you are reduced to guesswork.

RF parts seem to specify their abs max voltage assuming that a sine
wave might swing from ground to 2xVcc, but the data sheet specifies
abs max Vcc. So one has to cheat.

Or read the data sheet with some insight into what might normally be going on.
Even marketing clown don't write data sheets that lead a lot of customers to blow up a lot of parts.

Testing a $300 distributed amplifier chip for its genuine abs max
output voltage limit is emotionally tricky.

Asking the application engineer what might happen is less expensive, but means deferring to their expertise (when they have some).
<snipped the usual advertising>

Breaking things is fun. Well, cheap things.

Not for grown-ups.
--
Bill Sloman, Sydney