[sdiy] FW: earthing??

[Dan Snazelle]

no you were right

maybe i worded it wrong

when the reglators ARE touching the bottom, it doesnt work

when they arent and the case is touching the PSU on the PSU's side...it works.

i hadnt even thought about the fact that the regulators could short out the system by touching

the part number is

Haa15 08

anyone know what size screws i need to mount this (with the built in holes?)

thanks all

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> Subject: RE: [sdiy] FW: earthing??
> Date: Tue, 25 Nov 2008 13:12:49 +0000
> From: Jason.Tribbeck at ascom.com
> To: subjectivity at hotmail.com; synth-diy at dropmix.xs4all.nl
> 
>> it seems when it is flat, the only thing properly touching the case is
> the
>> tip of the regulator heatsinks (i think thats what they are)
> 
> From memory, the 78xx tab is connected to ground, but the 79xx tab is
> connected to the input voltage. If both of them are effectively shorting
> (through the heatsinks), then that could cause problems.
> 
> However, I would expect the opposite - i.e. it won't work if they're
> connected.
> 
> Do you have a part number for the PSU? I'm just guessing what could be
> wrong here....
> -- 
> Jason Tribbeck