I want to build a variable power supply.

I am using a computer power supply and I want to make the 5 volt 20A output variable.

I found an online website that has all the components that I need. But I have a problem. The step-down and step-up converter output different voltages. The step-down outputs 1.3-35V and the step-up outputs 5-24V. Can I use them even though they are different?

My power supply outputs 3.3V, 5V and 12V:

3.3V output 14A MAX

5V output 20A MAX

12V output 10A MAX

I want to select the 5 volt output and attach the converters there.These converters can output 2A max

I want it to be variable from 2-24Volts. Or at least from 5-24Volts

  • \$\begingroup\$ Just realize that those are some issues you'd worry about in a professional design and part of why a professional design might end up costing more than yours. \$\endgroup\$ – The Photon Sep 30 '19 at 17:56
  • \$\begingroup\$ power supply designs depend on the actual load. So it makes a big difference if you are driving a motor vs a LEDstring.. so my questions are critical for anwers \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Sep 30 '19 at 17:56
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    \$\begingroup\$ good for you, but we must know exactly why you need this or what you want to drive \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Sep 30 '19 at 17:59
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    \$\begingroup\$ General Purpose Lab supplies are much more expensive with bigger low ESR rugged parts and much better protection. With these Bangood parts you better buy spares because the protection from over heat , short circuit etc... and failure is poor. So good luck. \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Sep 30 '19 at 18:04
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    \$\begingroup\$ yes it will generate those voltages but a fuse will not protect the device from failure to any load \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Sep 30 '19 at 18:25

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