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i am building a SQL car, i have focal component speakers, focal subs and focal FP amplifiers. i have a carputer with a sound blaster audigy 2xs, using KXdrivers and doing a active crossover. i started looking for higher end solutions, some recommend running optical to an audison bit one, but would rather take a little bit more hands on approach. from what i understand thus far is these USB to i2s are ASIO compatible (freq allocation, time correction, or any other VST plugin you want to load, then output to a DAC like a ES9018, my concern is everything i am finding shows people using AC household power with transformers (which isnt a problem if can run a good "pure sine wave" DC-AC power inverter, but i'm also worried there will be some noise/static, my focal amps are 12vcd, the pc is powered by ( http://www.mini-box.com/M4-ATX ) which is dc-dc so my question is how can i power a DAC in automotive environment? charging system is 14.4 volts, i am no electrical engineer. but is there a better way then inverter?
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If you already have DC you could use DC-DC converters to get to the voltage required for the input. Using an inverter and then go back to DC will just increase your losses.
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Rank: Member
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Joined: 2/7/2013(UTC) Posts: 4 Location: waterloo on Thanks: 1 times
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from my understanding the DAC of the es9018 needs a 5VDC rail, the car is 12.0vdc (not running) and 14.4VDC running. will this be a problem? and will the output from the dc-dc converter clean power suitable for a DAC and OPAMP?, i notice some people are using a 110v transformer 9+9v with a PLASID PS, and on the opamp needs 15vdc so they are using a PLASID BP. Edited by user Thursday, February 7, 2013 6:39:31 PM(UTC)
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I would use a LCDPS to bring the 14.4VDC down to 5.5VDC for the Buffalo.
The output stage requires a bipolar supply (+12VDC, GND, -12VDC). For this you can use a DC-DC converter. The IVY would be the best suited for this application, since it has a very high PSRR.
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 1 user thanked Brian Donegan for this useful post.
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Rank: Member
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Joined: 2/7/2013(UTC) Posts: 4 Location: waterloo on Thanks: 1 times
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ok so the LCDPS on this site will output a clean 5V from 12-14.4VCD, perfect! i found a dc-dc bipolar converter, but is this any good http://www.murata-ps.com/en/products/dc-dc-converters/bipolar-output-isolated/mev1d1212dc.html ?
so i need
LCDPS (for DAC)
DC-dc Bipolar converter
UXA-2ui (usb to i2s) i was looking at others but they do not have "galvanic isolation" which seems to be a concern of a alot of people (can any one elaborate?)
buffaloIII
IVY output board
am i missing anything?
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Rank: Administration
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Rank: Member
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Joined: 2/7/2013(UTC) Posts: 4 Location: waterloo on Thanks: 1 times
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You sir are helpful, thank you very much. I want to have 6ch (ch independent active X/O,time alignment,and EQ) what would you suggest in terms of hardware, just to clarify. i dont remember mentioning that i need 6ch of RCA for my amps.
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