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Old December 17th, 2005, 03:01 PM   #1
Monkeyevil
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Default Electrical Gurus...

Just recently put XM radio in the shop. It's a small mobile/home unit.

At any rate I have it running of a 6v AC adapter. Whenever there is a big draw in the shop, (belt sander turns on, welder starts an arc, etc) the unit turns off and comes back on (our lights never dim or anything like that). It's a feature used for knowing when your car turns off and on... it seems pretty sensative and there is no way to turn it off.

If I put a small capacitor on the power side (after the adapter) do you think that will help stop that quick, small power drop to the unit? I know this would work fine in a car, but I don't know how the negative side of the AC adapter would also effect this small drop?

Thanks :D
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Old December 17th, 2005, 03:33 PM   #2
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That should work, I would use a 1000uf cap at 12v to do this, Radio Shack would have them.
To be really safe, you could make a small power supply filter with a bridge rectifier, put the output of the 6v supply on the ac pins and the cap on the DC pins with the XM radio. (I hope you can pcture this, I'm better at doing than 'splaining)i
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Old December 17th, 2005, 03:34 PM   #3
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Might help. The AC adapter already has a capacitor inside it somewhat doing that function, but its not real big.

I'd go for something like 470uf, 25v electrolytic cap, make sure you have the connections right, as electronics are polarized.

Normally for anything I'm designing in a car, we have maybe 100-470uF on the battery input, after the reverse battery diode. Depends on how long your drop out is. Ford usually likes more like 680uf or so, as they have longer dropout requirements (50mS) Don't suppose you have a digital oscilloscpe, do you? That'd make things easier.
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Old December 17th, 2005, 03:36 PM   #4
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Quote:
Originally Posted by BlooMule
That should work, I would use a 1000uf cap at 12v to do this, Radio Shack would have them.
To be really safe, you could make a small power supply filter with a bridge rectifier, put the output of the 6v supply on the ac pins and the cap on the DC pins with the XM radio. (I hope you can pcture this, I'm better at doing than 'splaining)i
I thought about something like that, but then you will have the drop across the rectifier diodes, so the 6 volts will be cut down to ~5.3v or so..
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Old December 17th, 2005, 03:44 PM   #5
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Purchase one of those 400 dollar clean power UPS
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Old December 17th, 2005, 05:41 PM   #6
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Quote:
Originally Posted by Haggar
I thought about something like that, but then you will have the drop across the rectifier diodes, so the 6 volts will be cut down to ~5.3v or so..
The adapter is adustable... so I can go to 7.5V if I need to.
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Old December 17th, 2005, 06:41 PM   #7
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Buy a 6V tractor battery and hook the ps and the radio up to it. :tonka:
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Old December 18th, 2005, 10:47 AM   #8
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Quote:
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Buy a 6V tractor battery and hook the ps and the radio up to it. :tonka:
Other than the ugly factor, this is the most reliable method.....
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