Instructables

Need hobby power supply.. Reccomendations?

I think its time that I invested in a good desktop variable power supply for building circuits and such. I have one currently, but I'm borrowing it from our school because they have a few extra and don't mind it being gone. But as the school year closes, I am going to have to return it. So any recommendations for a variable desktop supply? My budget is around $100 USD. Thanks!!! So far, looking at some of the ones from google, I like the looks and specs of this power supply. 

Power supplies like the one you link to are nice, and if you have the money to spend then why not get one?

I've got one that is similar to the one you link to
http://www.rmdelectronics.com/main.html?page=206-0305
except mine can only deliver 3A of current, and it has LED displays instead of LCD,and it cost me about 50 USD, ten years ago.

OK, maybe that seems like a lot of differences for some thing alleged to be similar, but the main features for this kind of supply are the ability to supply constant voltage, or constant current, and also the displays that tell you, at a glace, how much voltage and current are being delivered to your load.

Although, depending on what you are doing, those might actually be more features than you need. For example, if all you really need is a constant voltage supply at a popular voltage, like 5V, or 12V, or even both of those voltages, at currents of up to maybe 2A or so, then you can find that in an salvaged computer power supply or power brick.  In my home country, the former U.S., these can be found in thrift stores at very low prices, circa 1 USD, especially for unwanted  brick-shaped power adapters that have become separated from whatever it was they used to adapt power for.

Back to what I was writing about these lab bench type variable power supplies:  The reason I put the words constant current in bold is because that is a feature you will not find in any used power brick or computer power supply.  All of those supply regulated constant voltage.

Constant current is handy for loads that want constant current.  Some example loads that come to mind are LEDs and electrolysis experiments.  For electrolysis, constant current is handy because it gives you a constant rate of moles of electrons per hour, and thus constant rates for the other reactants too.
BTW, I just noticed this page:
http://www.circuitspecialists.com/i-181791.html
has the specs and manual for the power supply you linked to, and also they appear to be selling it for a lower price.
That supply looks nice and it is the price you are looking for.

I built this veritable power supply for less than $20.oo from salvaged parts and a proto board from Radio Shack.

Mouser is a good place for parts you can’t get at Radio Shack.

http://ca.mouser.com/search/Default.aspx

Joe
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Why not build your own?