Hi Gus, Most modular switching power supplies have a potentiometer which allows about +/-20% voltage adjustment. Do you see any pots on this unit? Sean On Mon, Jan 28, 2013 at 5:32 AM, YES NOPE9 wrote: > I have some surplus switching power supplies [SPS] ( all the same model )= that i have been messing with for fun. > They output 20 VDC @ 3A. I found a resistor on the PCB that I can change= out to get 24VDC. The SPS crashes if more than 100 ma is drawn from it @ = 24 VDC. As i reduce the voltage out , the SPS can support more output curr= ent. What should I look for that might be responsible for this behaviour ?= i would be delighted to get 24 VDC at 2A out of these units. i can suppl= y a photo if anyone is interested. > Much Thanks > Gus in Denver [99guspuppet] > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .