[sdiy] MG-1 first mods, VC res

[klosmon]

At 11:57 AM 10/31/2004 -0800, James wrote:
>Yes you can, but, depending on the circumstances, I try to avoid doing 
>this.  If you need both a 24 and a 15 volt supply, sure, why not.  As long 
>as the current through both regulators is within what they can handle, no 
>problem...but remember, just because the spec sheet says 1.5 amps or 
>whatever...what you really need to check is the max power...if you are 
>going to regulate 24 volts down to 15, and also run 1 amp through it, that 
>is 9 watts you need to get rid of...you will need a pretty sizeable heat 
>sink to do that.

Jim said the magic word:  "heat sink" (alright, so it's two words...)
One major factor you should never overlook, whether desinging a new power 
supply or repairing/refurbing an old one (it's one of the first things I do 
to the Prophet 5s that cross my bench) is make sure the heat sinking of the 
regulators is more than adequate for the task -- and being generous with 
the heatsink compound doesn't hurt, either.

~GMM (taking a rare break from the repair bench, which is looking more like 
a fort with all the ailing Prophets stacked around it....)