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Protect Your New Toy (Read 3232 times)
Kiwi Roy
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Protect Your New Toy
06/30/10 at 05:03:40
 
When you are testing your board for the first time if you don't have a current limited power supply you run the risk of smoking tracks if something is not right. A good trick is to connect a lamp in series. You want one that normally draws 3 or 4 times the current you require.
The lamp filament resistance is very low when cold but if you have a short it heats up and goes high resistance protecting the circuit, far quicker than a fuse will blow. A bright lamp idicates you have a problem.
I think the polyswitch may be designed to do the same thing, perhaps someone can tell us what the normal current draw is.
Roy Smiley
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« Last Edit: 06/30/10 at 05:11:17 by Kiwi Roy »  
 
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raz
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Re: Protect Your New Toy
Reply #1 - 06/30/10 at 08:10:46
 
It's normally about 80mA and still below 100mA with Optimiser connected IIRC. I use a rechargable 9V battery for testing, as it's convenient and does not have as much ability to vaporise PCB tracks as my 545 Cold Cranking Amps Odyssey...
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1100 Sport iniezione elettronica -- the perfect merge of a superbike and a steam train
 
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Kiwi Roy
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Re: Protect Your New Toy
Reply #2 - 06/30/10 at 08:24:17
 
Thanks Raz, I would hate to think someone might connect it direct to the bike battery, a 5 -10 Watt lamp in series would be ok. I will set my bench power supply to ~100mA then.
Roy
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