Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter - Page 110 - diyAudio
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Old 3rd October 2012, 07:02 AM   #1091
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I am not sure USB charging would be a great idea, especially since Ian's concept at the moment is to disconnect the input to the charger while music is playing. I just can't see these FIFO boards being installed in a particularly transportable DAC.
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Old 3rd October 2012, 02:26 PM   #1092
ggking7 is offline ggking7  United States
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Quote:
I am not sure USB charging would be a great idea, especially since Ian's concept at the moment is to disconnect the input to the charger while music is playing.
I'm all for disconnection during playback. What's that have to do with USB charging?
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I just can't see these FIFO boards being installed in a particularly transportable DAC.
Couldn't a battery+FIFO+isolator+clock be installed in the same small enclosure as one of the small DAC boards you guys are always flashing around?
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Old 3rd October 2012, 08:15 PM   #1093
qusp is offline qusp  Australia
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haha, i'm not sure you understand quite what you are getting into. even a modest dac plus buffer plus fifo combination is larger than you think and uses more current than you think, have you even checked to see how much current that is and how much battery that will require to run for more than a coffee break?

more likely you would be wanting to charge your laptop with the battery for your dac

also what small dac board? very few of the dacs shown here are small if you take the power supply and peripherals into account.
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Old 3rd October 2012, 08:18 PM   #1094
qusp is offline qusp  Australia
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boards are looking good Ian.
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Old 3rd October 2012, 08:49 PM   #1095
NicMac is offline NicMac  Italy
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USB charging does not sound that stupid an idea to me...
An USB connected DAC will always have a PC close by. Most USB ports are capable of 0.5A so why not if one is not listening 23/24?
I would however need a 24V charging voltage for I/V. Would this be possible to derive this from 5V USB?
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Old 3rd October 2012, 09:40 PM   #1096
qusp is offline qusp  Australia
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USB charging does not sound that stupid an idea to me...
An USB connected DAC will always have a PC close by. Most USB ports are capable of 0.5A so why not if one is not listening 23/24?
not on laptops they arent and if you need anything more than incredibly slow trickle charge then this is not even close to enough current, or voltage.

to have anything more than a couple hours charge for a collection of devices like this, then you are looking at a LOT higher capacity than you are using for SEN, which has very low current requirements. I just dont see its useful or even that doable for transportable and for home you can charge a hell of a lot quicker by other means. youre going to take a charge controller Ian has designed to have a totally passive mechanism and throw it on a DC-DC convertor from USB power?

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I would however need a 24V charging voltage for I/V. Would this be possible to derive this from 5V USB?
yes, but its not free, it'll mean you have less than 1/6th the current available once losses are taken into account

the only reason to try with USB power would be convenience, does the above still sound convenient?

Last edited by qusp; 3rd October 2012 at 09:45 PM.
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Old 3rd October 2012, 09:58 PM   #1097
qusp is offline qusp  Australia
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also, most USB HUBs have 500mA available, most home computers have 2 or maybe 3 hubs and each hub has a 500mA/2.5W budget to share between all the devices connected to that hub, if the power needed by a device is more than has been allotted on the last refresh, it will kill or deny a connection to save from over-current; so a device will become unavailable.
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Old 3rd October 2012, 10:19 PM   #1098
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Originally Posted by hochopeper View Post
Ian, in terms of power supply demands, I haven't seen a breakdown between how much current is needed for the main boards vs how much is required for the clock board. I am imagining that the clock board will have less load, though it would be nice to know for power supply sizing/design.

Chris
FIFO board would be around 100mA.
The duax xo clock board will be up to what xo you are using. Around 30mA beside.

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Old 3rd October 2012, 10:46 PM   #1099
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Originally Posted by ggking7 View Post
I would eventually like to power your FIFO and clock board with batteries. Would your battery board be suitable to power both? What are the input voltage requirements of the FIFO and clock board?

As an aside, the ability to charge the battery board via USB, however slowly, would be a huge plus for me. When traveling especially, it's so convenient to plug the laptop into AC and everything else into the laptop.
Only the clock board needs really low noise power supply like battery.

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Old 3rd October 2012, 11:06 PM   #1100
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Originally Posted by iancanada View Post
FIFO board would be around 100mA.
The duax xo clock board will be up to what xo you are using. Around 30mA beside.

Ian
Thanks Ian!
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