Is there anything that can be salvaged from a UPS? - diyAudio
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Old 29th May 2003, 04:13 PM   #1
JCoffey is offline JCoffey  United States
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Default Is there anything that can be salvaged from a UPS?

I work with Computers all day, and have a few APC 450's that have gone bad. What should I snag? Caps, transformers? Has anyone else on here grabbed parts off of them?
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Old 30th May 2003, 04:41 AM   #2
karma is offline karma  Canada
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lotsa parts here caps transformers heatzincs i even use the plugs o and the cord
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Old 30th May 2003, 07:17 AM   #3
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The inverter transformers often have more turns than a normal mains one, so if you reverse it and use it for normal stuff, it will generally not go =BUMP= when you turn it on like big trannies generally do. Or so the ones I have don't anyway.
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Old 1st June 2003, 02:40 PM   #4
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Default PSU parts

DEFINITELY get the transformer. If you can unwind it (counting the turns, first) you can use it for your own SMPS. There are lots of plug-n-chug formulae out there for figuring the number of turns for any frequency, if you know the core material type. Also, the output diodes, inductors, and controller chip (usually a TL494, sometimes labelled KIA7500). Don't bother with the low voltage output caps, as they are usually of lower quality than what we audio DIY'ers would use. Hope this helps!

'73,
N8XO
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Old 1st June 2003, 03:03 PM   #5
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Default links plz

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There are lots of plug-n-chug formulae out there for figuring the number of turns
can you point me to some links?
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Old 2nd June 2003, 01:04 PM   #6
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Thumbs up Formulae

Try George Chryssis' book "High Frequency Switching Power Supplies", chap 4 on transformers. Use the 1989 edition- it's a little more up to date than the 1984 one.
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