I recently bought one of these...
30V, 3A, constant-current, "mini", for $50
<http://www.mpja.com/0-30V-0-3A-Mini-Bench-Supply/productinfo/9615+PS/>
....but have not used it yet.

The 5 amp version, $70.
<http://www.mpja.com/0-30V0-5A-Mini-Bench-Supply/productinfo/9617+PS/>

A current-limited power supply is vital for electronics work.  If you=20
know your circuit should draw say 200mA, you can set the current limit=20
to 500mA, and if you hit it, then something is wrong and you get a=20
chance to debug before you smoke your board.

Cheers
J



Nathan House wrote:
> I'm burning through batteries like nobody's business and think it's
> high time I purchased a power supply. I know I can make my own board
> with voltage regulators for common voltages like 3.3, 5, 12, etc, but
> I think I'd rather have something that's adjustable and can source a
> lot of current in case I ever need it. I've been looking at power
> supplies on ebay and stumbled across a very low price one that seems
> to be pretty popular (the seller has sold 159 of them):
>
> http://www.ebay.com/itm/Precision-Lab-PS305D-Variable-30V-5A-DC-Power-Sup=
ply-/120716204084?pt=3DLH_DefaultDomain_0&hash=3Ditem1c1b3f1834
>
> I've never heard of the brand before. What do you think, good buy or not?
>
> Thanks,
>
> Nate
>
--=20
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