Input protection (again)

Pretty long settling tail there... (Fig. 5).

Cheers, James Arthur

That would be the effect of the device's negative temperature coefficient, as exercised by the device warming up as power flows through it for the first few seconds?

(In other words, as the voice at the Tomb of the Unknown Implementor once said, "It's not a bug, it's a feature.")

Yeah, but you can get four times the max voltage by stacking four in series. For the lower currents, breakdown doesn't burn 'em up. If your budget holds, so does the regulation...

Ixys makes some self-protecting SSRs.

This is weird:

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Robert, have you ever noticed that small black cloud permanently hovering over your computer?

Cheers

Phil Hobbs

Thanks Piotr, I looked at all the low current depletion fets (in stock) at Digikey. (There aren't that many.) The BSS126 looked like it might work. (As long as you can limit the power somehow.)

George H.

Doesn't look like it--the typical current at -0.5V is well below the current limit, especially at low temperature.

Plausible. A J107 would be in the ballpark except for the voltage spec.

Yup. Magic.

Cheers

Phil Hobbs

Fun. I've actually never used an SSR for anything--I didn't know they came in NC varieties.

I wonder if the ON resistance of the SSR would be predictable enough for that to work reliably.

Cheers

Phil Hobbs

Den fredag den 31. marts 2017 kl. 18.03.50 UTC+2 skrev John Larkin:

we tried some al5809 as current drive for relays, they didn't like that much

What do you mean "over"? It is IN the computer. Recently got a 500GB SCSI hard drive and no matter what i do, Win2K insists it is 128G. Put data on it, label and data look OK In WinXP, no label,no data , unallocated. Wonderful. Does not help that Parted Magic will NOT format:LESS than one second? Give me a break.

ng over your computer?

upgrade to an OS from this decade

See my posting "Linux dd diskwipe is LIAR.

I've had machines like that. Not any more!

OK linux distros aren't hard to find. Linux is anarchy though, so for every 1 good one there's a dozen that aren't.

NT

That's my assumption, too. It's not a precision device.

Cheers, James Arthur

That's probably the old head, cylinder, sector issue that plagued us for

Another issue with old MS operating systems is that they'd croak if the partition wasn't aligned with (iirc) a cylinder boundary.

On sane hardware, dd really does what it says it does. I use it a lot to duplicate microSD cards for RasPi's and phones.

Cheers

Phil Hobbs

The 128G hdd limit is a well known issue from years ago. Win 98 had a 3rd party patch to fix it, I expect there's one for win2k somewhere too.

NT