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HelicopterMain Discussion › PC power supply & Torqmaster
06-06-2004 04:20 PM  13 years agoPost 1
Pir8

rrNovice

Santo Domingo - Dominican Republic

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Hello!
I tried to power my Torquemaster with my home made PC power supply (12v, 14 AMP) but whenever i try to start it the power supply it gets shutdown.

Anyone know Why?

I also tried to measure the current used by the Torquemaster with a Multimeter (10amp unfused side) and noticed that when i make the connection with the multimeter the Torquemaster start and function very well but if i do it directly it doesn't

Powersupply + Torquemaster = not working
Powersupply + Multimeter (unfused side) + Torquemaster = OK

Any help would be appreciated.
i really want to be able and use the torquemaster with just the power supply so i dont have to use my car battery or my field batery while at home.

Thanks.

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06-06-2004 04:36 PM  13 years agoPost 2
z11355

rrMaster

New England

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starters basically put a short circuit across the
power supply output and the supply responded
by protecting itself and shutting down before
damage.

Yes, I ruined a 25A power supply doing the
same thing.

The meter may add just enough resistance to
stop the power supply from shutting down and
given the machine you're trying to start, it was
enough.

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06-06-2004 05:08 PM  13 years agoPost 3
jag01

rrApprentice

Pennsylvania

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Most pc power supplies need a single from the motherboard to boot the system up.

keep them blades turning !

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06-06-2004 05:55 PM  13 years agoPost 4
S_Owen

rrApprentice

Wichita Falls, TX.

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ATX power supplies require a load on the 5v rail to turn on, and stay on. AT (manual switched) power supplies do not.

All computer power supplies require overload protection, as per UL requirements. Any type of protection is acceptable to UL as long as current is no longer supplied to any or all rails. Again, as per UL requirements, no PSU circuit can output more than 5 amps without clamping. At 5 amps, the PSU is required to "self protect". That's max allowable though. Some "lesser" PSU's do it at much lower current levels.

Your best bet would be to purchase a 10 amp (or more) 12v standard power supply. Those can be had from any Radio Shack or mail order.

The one I use says "Archer" (an older RS brand). It has a 10 amp 12v output, and it's fused at 15 amps. It will do anything I have ever needed it for. I think it was $50-$60 new several years ago.

[b]Murphy's Constant:[/b] Matter will be damaged in direct proportion to its value.

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06-06-2004 10:03 PM  13 years agoPost 5
Fullagas

rrKey Veteran

Michigan

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.
I'd bet the starter is pulling much more than most power supplies can put out.

Why not just use a 12V battery? It will take the abuse.

.

Flying helis since gyros had springs.

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06-07-2004 05:00 AM  13 years agoPost 6
Pir8

rrNovice

Santo Domingo - Dominican Republic

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ok
thank you all for your responses.

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06-07-2004 06:54 AM  13 years agoPost 7
Paul_Barsamian

rrVeteran

Glenview (North Suburban Chicago)

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Fullagas is right, I measured my geared magnum and my hobbico starters with a high current ammeter and they can pull 50 or 60 amps pretty easily in short bursts. Your pc power supply has a cut out like most of them do so that you don't burn things up when you pull too many amps.

I would run the starter off the battery only, not from your power supply.

Son, before you can soar with the eagles you have to learn to sh** with the chickens

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