Variable Voltage Supply

From Adam Colton
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Variable Voltage supply I am building. Three outputs and a digital readout.

I learned that the linear regulators will be extremely inefficient, especially when doing something like stepping 20V down to 5v. I should use a switched regulator (similar to a Class D amp). The lm2679 seems good. MC34063AP seems better.

I ordered some LM2575T, use the schematic on the top of page 24: http://www.ti.com/lit/ds/symlink/lm1575.pdf

  • Calls for a 2000uF cap, but those were expensive so I got 1000uF and can use two in parallel

https://hackaday.io/project/4154-bench-power-supply

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