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Old 28th April 2003, 11:21 AM   #1
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Question Scavenging Parts From UPS Power Supply

I'm looking to scavenge some parts out of an old UPS that I no longer need for my gainclone project. The transformer is an 8-0-8 I have no idea how many amps, but it certainly cooked the 600V 15A bridge I connected to it. Anyway, are there any other usable pars in these things (the bateries are fried). Also is 16V enough to run an LM1875 or will I run into some undervoltage issues.

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Old 28th April 2003, 01:20 PM   #2
sangram is offline sangram  India
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Hey, I also have a fried UPS - some chips are no-go, and a new battery hasn't helped, so can I step up a 12V to mains, and then step down using a regular transformer, to power amps etc.? It can make a nice PS for a car amp...
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Old 28th April 2003, 02:39 PM   #3
Paulr is offline Paulr  United Kingdom
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I also used the transformer from an old UPS for my gainclone. There were however 4 wires out & 2 plug connectors with heavy duty cable straight to the board. Measurements gave 1 x primary & 1 x 24V secondary (28.5V with no load) coming out on the wires & 14.5 V off the Lucar type plugs.

Batteries were fine & charged & setup as 2 x 12V sealed in series. These are on hold for testing opamp circuits that I'm working on for the car (+- 12v with 0v in centre)


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Old 28th April 2003, 03:41 PM   #4
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Default squeezing useable voltages out

the example below shows how to get more (useable) voltage out of a computer power supply -- I show the MC31466 switcher chips since I have them in abundance (anyone want some email me privately.) The circuit uses SEPIC topology to boost and invert voltage, for the sake of clarity the compensation network isn't shown (it's on the PDF at ON SEMI, however.)
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Old 28th April 2003, 03:46 PM   #5
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Default forgot the schematic

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