Atx Switching power suply in serie.

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cba01

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Hi all, I need some info on serializing ATX SPS. Is this possible to do and does someone have any circuits to help me out. The goal is to make a variable bench power supply, I hoped that I could put 3 atx supply's in serie to have 0-36V.

cba01
 

Try to find the optocoupler (PC817 usually) and the "Shunt Voltage Reference" TL431. Then you have to change the R1/Rb Voltage divider resistor network and possibly the R5 resistor. See the attached image.

 

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