Products > Test Equipment

Power Supply: Build or Buy?

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br4n_d0n:
The general consensus thus far seems to be for purchasing a power supply as there seems to be a lack of good info or kits out there for a beginner such as myself. However, if someone could find a really nice kit or great tutorial for an absolute beginner, I may take a look.

So, any recommendations for one $100 or less?

Fungus:

--- Quote from: br4n_d0n on May 04, 2023, 07:29:49 pm ---The general consensus thus far seems to be for purchasing a power supply as there seems to be a lack of good info or kits out there for a beginner such as myself. However, if someone could find a really nice kit or great tutorial for an absolute beginner, I may take a look.

So, any recommendations for one $100 or less?

--- End quote ---

There's lots of modules on Aliexpress, eg. https://www.aliexpress.com/item/4000742314477.html

Quality varies but they all need some sort of external power supply to power them, typically with a voltage higher than the maximum desired output voltage.

I've got one of these: https://www.aliexpress.com/item/1005001530484759.html

It's really tiny and I can power it from a USB-C powerbank or a suitable phone charger up to 30V - portable bench supply! It works well enough but I don't think I'd use it as my main supply.

FWIW Dave did a series of videos on those modules:








Fungus:
Me? I wouldn't want to power my soldering iron from my bench supply - imagine having to swap the cables around every time you want to solder something, or be switching between soldering and powering. That would get old really fast.

Get yourself a fixed 24V supply for that.

nctnico:
Be sure to get a linear power supply as your primary lab power supply. Switchers (which includes those dc-dc converter modules) output too much noise to make meaningfull measurements to a circuit.

james_s:
Switchers can be very clean, it's all a matter of how well they are designed. Linear power supplies are easy to make quiet though.

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