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Old 13th June 2011, 07:12 AM   #1
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Default Low Noise Linear regulator power supply

Hello

I am looking for 5V 0.4A Linear regulator for car enviorment

the regulator should accept 13-14 (varliable -car electric system) and provide clean 5V with very low noise/ripple

the power supply is for USB to S/PDIF converter
for more information please look at the following link, which describe power supply for home similar to what I need in car:

USB Low Noise Power supply, low noise power supply, audiophile power supply, usb dac power supply

Thanks
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Old 13th June 2011, 07:22 AM   #2
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Are you planning to build it or buy it?
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Old 13th June 2011, 07:27 AM   #3
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I preffer to buy one, becuase I don't have experience of building electronic circuits
but I none exsist for my specific requirments I will build or pay some professional to build for me
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Old 13th June 2011, 08:17 AM   #4
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No ripple to worry about, clean depends on installation as much as anything, likewise noise - it shouldn't be a problem unless the vehicle has it's own issues or the driver likes to leave the blinker on.
I Googled "car dc converter -inverter +regulated". I don't know where you are, but the Coby CA709 IC Regulated 800mA Universal DC Car Converter is available from the world's largest retailer.
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Old 13th June 2011, 08:39 AM   #5
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this is simple switching power supply and not linear power supply
it probably have ripple and noise

I need something equal to the supply I post in the link above
that fit to car elecrical system

Thanks
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Old 13th June 2011, 09:10 AM   #6
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Quote:
this is simple switching power supply and not linear power supply
Well, it actually isn't switch-mode. Switch-mode would be more complex than is remotely necessary. This thing is just dropping volts.
Quote:
I need something equal to the supply I post in the link above
An audiophile DC-DC converter? Sorry, I don't know of any.
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Old 13th June 2011, 09:50 AM   #7
AndrewT is offline AndrewT  Scotland
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DC-DC converter = voltage regulator.
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Old 13th June 2011, 10:19 AM   #8
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anyone can recommend of device meet this specification?
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Old 13th June 2011, 10:27 AM   #9
agdr is offline agdr  United States
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I've read about that AQVOX adapter before and haven't seen anything like it for cars.

But... you could use a 12vdc to 120vac auto inverter

Walmart.com: DP Audio Video, Car Power Inverter: Auto Electronics

then plug the AQVOX into that to take it back down to 5vdc. The AQVOX seems to be well filtered so it should get rid of any noise from the inverter.

Like Andrew says technically all you need is a LM7805 regulator IC with a filter circuit in front of it. But if you are not into building circuits then the above would do the job.
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Old 13th June 2011, 12:44 PM   #10
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can you recommend me of such regulator?
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