LAB POWER SUPPLY

[glinjik]

There's at least one commercial product that does this, but the voltages are selected in 1.5 volt increments to match batteries, so not as useful as it could be.

You could use a single LM317 and switch between various resistors electronically or with a mechanical switch.


edit: Found one

https://www.amazon.com/Philmore-Multi-Voltage-Regulated-Power-Supply/dp/B004M45MHQ

The voltage selections are not useful (other than maybe 12V):

Multi-Voltage Output: 3 , 4.5, 6 , 7.5, 9 , 12 VD

Depends on the task at hand. When doing repairs, I would find those voltage selections very useful, as they correspond to widely used battery combinations.

Well looking like ill have 3.2-6.2+, 12v+-, 19v+ i think thats a good range and one spare transformer if i decide later to add another voltage range