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-boun...@febo.com [time-nuts-boun...@febo.com] On Behalf Of Peter Vince [pvi...@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.vanh...@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. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
