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How to change 12V switching power supply to 24V, or two in series?

It cannot be changed, because the number of turns of the output 12V winding is designed according to the output 12V.

Of course, you can also string the two together. [ 12 V+,GND],[ 12V+,GND]。 ] You use 12 V+ to do airborne GND. Then the two ends are 24V+ and 24V- respectively.

That is to say, one's 12V is short-circuited to the other's GND, and the remaining two endpoints are 24V+, GND.