[time-nuts] fluke.l monitor for Thunderbolt . . . the sagacontinues
David VanHorn
D.VanHorn at elec-solutions.com
Thu Jul 7 19:29:36 UTC 2011
There are levels of "it works"... Level 1 is "I built one and it works". Level 2 is "I built one like yours and it works". Level 3 is "I built a bunch and they all work". Level 4 is "I built a million and they all work". Level five adds environmental issues, EMI and ESD. I usually work at level 5.
With that diode scheme I would expect a bunch of current-driven ripple in VCC, which could cause various amounts of flakiness.
Hard to say without data sheets and a scope, but that's really the point. A solid analog regulator would be a slam-dunk level 4 solution.
________________________________________
From: time-nuts-bounces at febo.com [time-nuts-bounces at febo.com] On Behalf Of Peter Vince [pvince at theiet.org]
Sent: Thursday, July 07, 2011 1:00 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] fluke.l monitor for Thunderbolt . . . the sagacontinues
But surely it doesn't matter David? There is nothing critical in
there, it's just a display. As long as the voltage is within the
processor's operating window, that is surely good enough?
Peter
On 7 July 2011 15:48, David VanHorn <D.VanHorn at elec-solutions.com> wrote:
>
> Vf is highly dependent on current and temperature. The processor alone is a very dynamic load.
> I wouldn't trust it in a hobby project, and I can't imagine proposing it for a professional design.
>
> Without knowing much in details, a bog standard 3.3V regulator is $0.78 at Digikley, in singles.
> L78L33ABZ-AP
> If there are unusual requirements, then that might go up.
>
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