Products > Test Equipment
Power Supply: Build or Buy?
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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