I'm not sure that carrying a spare wheel up to the airing cupboard is an improvement over carrying a car battery there! In any case, if I had a high-pressure hose that long I could use a footpump. Is such a hose readily available?
Richard.
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Most I've tried are happy with a load on the 12V line. If the 5V line needs something a couple of watts bulb usually suffices and provides a power on indicator. I've never come across an ATX type PSU that requires a load on the 3.3V line if either or both of the others are loaded. Given how easy ATX PSU's are to obtain for nothing they make very useful PSU's.
I've still got a few 500W server versions purchased for 50p each, one of which has been running a pump virtually non-stop for 5 years (it gets switched off to change the pump every 6 months)
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I seem to recall that when I replaced my PC's PSU it had about 20 connectors on it and at least one voltage was not used at all.
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That's probably fine for what you're doing. I have come across a situation where a company was using PC PSU's just for powering disk drives, and there was a problem with lack of regulation of the 12V rail unless you drew more current from the 5V rail than the disks alone did. Once the problem had been identified, they tried several other PSU makes, and they were all the same.
This was a long time ago, and may well not be the case with current PC PSUs.
You just need a better pump. I can certainly recommend the following for = =A320:
Not only does it pump bike tyres up with ease (as you'd hope and expect) bu= t when my car tyre foot pump died I gave it a go but didn't expect it to fu= nction all that great assuming the volume would demand a lot of pumping. It= turned out to be excellent and pumped the tyre up in a fraction of the tim= e and effort my foot pump took.
Mathew
I don't know the distance involved, but I use a £20 car tyre pumper upper on the end of a thirty foot length of 0.75mm csa mains flex and although there is obviously significant voltage drop all it does is slow the pump a bit, which doesn't matter. If you're running it from the car you could run the engine to lift the volts a bit.
I suppose you could have a really long cable if you used 2.5 T & E or something similar.
Bill
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