Computer UPS, any good parts inside?

imperfectcircle · 29th January 2007, 06:57 PM

I have a bunch of old UPS that I got for free from work, they range in size from 250va to 750va. Is there any useful parts inside these things bvesides the batteries?? there are some nice sized transformers in them, are they useful for anything, maybe diy power conditioners??
thanks

unclejed613 · 30th January 2007, 04:12 AM

probably plenty of high current transistors and heat sinks.
basically a UPS is a battery powered sine wave oscillator and high power amplifier with the transformer as the load. you will also find lots of useful passive parts, and probably some fair to good quality op amps as well. most UPS's have sine wave output, but a small few of the cheapies might have a square wave output. it's best to test a UPS to find out

eds65gto · 30th January 2007, 04:32 PM

Hey:
They make nice inverters for mobile use. Just bring the battery leads out , use a 5A diode in the pos lead , and hook to a car battery or other suitable batt.
Also put a diode in the DC supply lead , to the batt , from the internal 12V supply to isolate the two sources.
Now you can run the UPS from a car batt. or AC.
This is all from an Amateur Radio magazine , I think " 73 ".
Hope this helps
Ed

29th January 2007, 06:57 PM	#1
imperfectcircle diyAudio Member Join Date: Jan 2005 Location: nyc	Computer UPS, any good parts inside? I have a bunch of old UPS that I got for free from work, they range in size from 250va to 750va. Is there any useful parts inside these things bvesides the batteries?? there are some nice sized transformers in them, are they useful for anything, maybe diy power conditioners?? thanks

30th January 2007, 04:12 AM	#2
unclejed613 diyAudio Member Join Date: Dec 2006	probably plenty of high current transistors and heat sinks. basically a UPS is a battery powered sine wave oscillator and high power amplifier with the transformer as the load. you will also find lots of useful passive parts, and probably some fair to good quality op amps as well. most UPS's have sine wave output, but a small few of the cheapies might have a square wave output. it's best to test a UPS to find out __________________ Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net spammer trap: http://www1284177414881.v-dc.net/

30th January 2007, 04:32 PM	#3
eds65gto diyAudio Member Join Date: Dec 2004 Location: Mt Pleasant Sc	UPS Hey: They make nice inverters for mobile use. Just bring the battery leads out , use a 5A diode in the pos lead , and hook to a car battery or other suitable batt. Also put a diode in the DC supply lead , to the batt , from the internal 12V supply to isolate the two sources. Now you can run the UPS from a car batt. or AC. This is all from an Amateur Radio magazine , I think " 73 ". Hope this helps Ed

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