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BrianG's Avatar
Posts: 14,609
Join Date: Nov 2005
Location: Des Moines, IA
08.03.2008, 10:42 PM

No you CANNOT put all three rails in series - they all share a common ground.

Hmm, I thought the mod was fairly straight forward. The diodes are just to drop ~1.4v (0.7v each) so the sense wire sees less voltage than there actually is. So, it causes the regulator circuit to boost the output voltage until there is ~12v on the sense wire. This causes the real output to be ~1.4v higher than that, or ~13.4v.

I could have used simple resistors as a voltage divider to do the same thing, but preferred the diodes method.

Think of the sense wire as the feedback pin on a regular linear voltage regulator, or the - pin of an op-amp. Same basic thing.
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