Author Topic: Is my power supply okay?  (Read 461 times)

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Offline MuffinsTopic starter

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Is my power supply okay?
« on: October 09, 2024, 08:32:55 pm »
I just bought a power supply off of Ebay, it's a linear one from RS. This one:

https://uk.rs-online.com/web/p/bench-power-supplies/1757367?srsltid=AfmBOooTPqgRXlLzwrGbxjqXV4c1zNDLIn2LEZK_EJlZGOcvb4GtTIG0

Now, the seller failed to mention that the power supply had been dropped and the pics hid this fact. Something hit the side of it enough to put a deep dent in the sheet metal on its side and the inertia of the transformer being jolted also bent the bottom panel a little.

The machine does work though, it outputs the correct voltages. The problem is when there is a current more than say half an amp the transformer buzzes at the supply frequency. Seems to still work fine at 2.5A and I haven't taken it passed that yet.

Do you think I should return it or should I have a go at fixing this? It was half the new price.

 

Offline thm_w

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Re: Is my power supply okay?
« Reply #1 on: October 09, 2024, 09:08:17 pm »
Crank it to 5A and let it run for a while. Maybe tighten those screws you can see on the bottom see if that affects the buzzing at all.

Sure the damage didn't happen when shipping to you?
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Offline PlainName

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Re: Is my power supply okay?
« Reply #2 on: October 09, 2024, 09:37:37 pm »
Quote
Do you think I should return it or should I have a go at fixing this? It was half the new price.

If you're asking then you don't know if you can fix it, and once you try you can't send it back. Thus the logical thing would be to start the return process.

You could contact the vendor and tell them that you intend to return it, and why, and suggest and alternative in that you keep it and then give a partial refund (the amount to be negotiated between you). But be aware that going that route would make them suspicious that you're trying to pull a fast one, so a straight return is probably wiser.
 

Offline MuffinsTopic starter

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Re: Is my power supply okay?
« Reply #3 on: October 10, 2024, 11:19:38 am »
Okay, thinking on this I've requested a refund rather. Probably the better decision.

Now to look for another bench power supply.
 

Offline PlainName

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Re: Is my power supply okay?
« Reply #4 on: October 10, 2024, 09:46:46 pm »
Do you have particular requirements? I might have something suitable, and this seems like a decent excuse to regain some shelf space  ;)
 

Offline MuffinsTopic starter

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Re: Is my power supply okay?
« Reply #5 on: Yesterday at 08:29:01 am »
Well I would like a decent linear power supply, with two outputs would be great. What might you have available?
 

Offline PlainName

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Re: Is my power supply okay?
« Reply #6 on: Yesterday at 08:45:27 am »
I meant in the way of minimum voltage and/or current.

Also, whereabouts are you located? Shipping for linear supplies can be a drag, so a possible collect or drop off could make the difference.

Only single output but would this be suitable:

https://uk.farnell.com/tenma/72-10480/power-supply-1ch-30v-3a-adjustable/dp/2251946

It's a badged Korad KA3005 (or vice versa) and schematics are apparently available on t'web.
« Last Edit: Yesterday at 08:55:50 am by PlainName »
 


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