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Old Jan 24, 2006, 01:40 PM
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Power Supply For Bench Testing

Hi,

As I will need to carry out extensive bench testing of my kilo, I found that I couldn't be doing with recharging my batteries all the time, so bought a ATX Computer PSU and converted it

http://wiki.ehow.com/Convert-a-Compu...b-Power-Supply

12V for TX and 5V for the RX, servos etc

Michael
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Old Jan 24, 2006, 02:19 PM
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Nice, these power supplies are cheap and plentiful too
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Old Jan 24, 2006, 02:21 PM
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Busy Guy

Himzy,

Were'nt you building an Akula??
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Old Jan 24, 2006, 02:37 PM
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I've got a couple of conversions to do first then I start on the Akula
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Old Jan 24, 2006, 02:38 PM
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Quote:
Originally Posted by TheMetriX
Nice, these power supplies are cheap and plentiful too
Yup, and they have temperature, overload and short circuit protection built in.
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Old Jan 24, 2006, 03:04 PM
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Just don't zap yourself, electricity can hurt... LOL
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Old Jan 24, 2006, 03:34 PM
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lol,

Unless it's AC .................

Michael
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Old Jan 24, 2006, 04:19 PM
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Don't touch these power suppplies. They are switch mode supplies, and need a rated load on each output for the regulation to work. If you don't then the regulation can not often be relied upon. I design multi-output switch mode power supplies for many applications, and believe me with the high frequency ripple and poor regulation, you would be better off using a car battery. If you are not qualified, then stear clear of this type of supply!
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Old Jan 24, 2006, 05:04 PM
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Well when I run mine I stick drives on the end of them, so far so good.

Michael
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Old Jan 24, 2006, 05:13 PM
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Michael,

Man, I'm going to pull you up there. NEVER EVER joke about electricity.

It can and will kill, even small voltages can be fatal.

I'd go looking for a good linear regulated supply at a HAM radio show. You can pick them up very cheaply if you know what you're looking for, and they're a lot more dependable than switch-mode supplies IMHO.

Andy
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Old Jan 24, 2006, 05:49 PM
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The other thing you have to consider about switch mode supplies is that they are designed to feed into external regulators, IC's and local smoothing caps. At power on the surge taken by these components is minimal compared to that taken by motors, which are at start up essentially inductors. When a switch mode power supply is designed, it is designed to feed a particular load, if one is designed to feed a motor then it's design is entirely different, it would have larger output caps, a different feedback loop and current sensing. If these computer supplies where the bees knees for all applications then they would be used in all applications, but they are not! they are used for PC's and PC peripherals.

Be warned, mains Kills, they also have 400vDC primaries, this can also kill! You don't get a second chance. Feel lucky punk?
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Old Jan 25, 2006, 05:15 PM
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Thanks Andy and Akula, I'll bear it in mind.

Michael
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Old Feb 01, 2006, 07:01 PM
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Do a search in the battery and charger section, alot of these have been converted to run chargers and they work well for that. I use them run my Lipoly chargers. Having said that, they dont seem to take sudden heavy loads very well(shut down), so I use a linear supply for motor testing.
There have been people describing working on them hot, without the cover!
Use common sense.
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Old Feb 01, 2006, 07:46 PM
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Yes, like I said, electricity hurts. The visible damage is nothing compared to the internal damage it can cause. Be safe...
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Old Feb 05, 2006, 07:42 AM
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Akula971 is quite correct. Switch-mode power supplies need loads, otherwise the regulation isn't reliable. It's better to get a linear type power supply. The internals of switch-modes run at 250 volts or more too.
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