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Old 14th September 2012, 06:08 PM   #1
ilardi is offline ilardi  United States
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Default Bench Power Supply

I am tired of having to start every project I prototype by building a power supply, so I have decided to build or buy a decent adjustable voltage, adjustable current (current limited), dual power supply, for my bench, say about 25 volts and ≥ 2A. I had pretty much resigned myself to building one, but have noticed that the cost of new, adjustable power supplies on eBay has decreased. This one, 30V 5A 110V Precision Variable DC Power Supply w Clip Cable Digital Adjustable | eBay rated at 30 volts and 5A is pretty inexpensive. But I have a few questions for the experts: 1) could I lash two of these together to create a bipolar supply and 2) do the specs seem good enough for prototyping audio circuits. In particular I was wondering about the noise rating of ≤ 1mV RMS.

Thanks.
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Last edited by ilardi; 14th September 2012 at 06:09 PM. Reason: delete duplicated signature
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Old 14th September 2012, 09:34 PM   #2
Spiny is offline Spiny  United Kingdom
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these are floating power supplies with a ground you can tie to either polarity. so you can use two, connect the + and - on two supplies together and ground that point to the chassis ground.

I use a similar one but with two outputs, had it for some time now, you can centre tap (-30 -0 - +30) or link to give a high voltage supply (0-60) the current limit has saved many a project.

the noise is fine for general prototyping

this type Dual lab supply

Last edited by Spiny; 14th September 2012 at 09:37 PM.
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