Re: [uCsimm] Voltage Regulator on uCgardener

From: John Jeffers (
Date: Mon May 21 2001 - 10:31:10 EDT

I use a 200ma 6V supply it's very small and 7VDC unloaded.

Check the unloaded voltage of the 800ma unit if it's anywhere over 9V
thermal shutdown may occur as described.

Also check that you are really getting DC. These things occur more than
one might think.

Other than that I agree with Pete.

>If the regulator overheats it will shut itself down, so checking the
>output should show it going down until the ucsimm doesn't work anymore.
>Probably there is a near-short-circuit somewhere, or you have a bad
>regulator chip. THe usual suspect would be the tantalum bead capacitor
>on the output of the regulator. Try removing the ucsimm module and see
>if it still gets hot. If so then see above! Even in normal operation
>the regulator gets quite warm, but not usually enough to shut it down.

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