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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

RE: help modding LPS to get different output voltage

My thought is that you are looking at a regulated supply. Voltage regulators require a certain amount of headroom over the regulated voltage output, in order to maintain regulation. So I think your particular set up will not put out more than 16.8 V without dropping out effects. The capability of the power supply is determined both by pOwer transformer and by the regulatory circuitry. In addition, if your computer is connected to the LPS while you were adjusting the trimmer, perhaps there is also an issue with current. I mean to say that the supply cannot produce the current at the voltage necessary to run your Mac.I did not look at the other information you supplied: what is the stated capability of that power supply? Is there anything to suggest that you can adjust the output voltage up to or beyond 20 V? And what is the current capability, and what is the current requirement of the Mac?


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