Sunday 26 March 2017

Connecting power supplies in series


I need to draw approx 4 amps for 10-15 hours at a minimum of 18V.


I have hooked up two 300 watt power supplies in series:




  • +12V on one and +5V on the other: the output is only +15.8V rather than the 17 point something that I was expecting

  • +12V from each: then one power supply shuts down.


Why does this happen and how can I get the +18V (or more) that I am after?




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