Posted 23 April 2013 - 06:42 AM
I got myself an original Apple Bluetooth dongle, A1114, complete with an antenna and a connector.
So I have to reduce the voltage from 5V to 3,3V.
For that I bought a simple voltage regulator. TO-220, https://www.sparkfun...s/LD1117V33.pdf
According to the guy in the shop this should do just nice regulating 5V down to 3,3V on the USB port.
I also read I could drop the 3,3V from the PSU, since the orange wire provides 3,3V, however some say it might be unstable or not good for the dongle. Correct?? I mean, I do have a very good PSU, Corsair HX750.
Do I have to put anything else around the voltage regulator, or would it be enough to connect the input/output (left/right connector) to the corresponding wires giving power on the USB connector and the Apple Module, and just connect both ground to the middle pin?
Posted 23 April 2013 - 05:57 PM
Posted 23 April 2013 - 09:40 PM
I guess no. It should be enough. It's not a CPU after all
my only question is if I need anything else but the voltage regulator?
Posted 23 April 2013 - 10:04 PM
Posted 24 April 2013 - 08:15 PM
I guess what's why on Macs the module is powered from PSU stand-by circuit so it is could be possible to use a BT keyboard/mouse on boot (though the firmware, read EFI, should also support this as in fact it does).
If it were always on, then I could probably power up the computer with the BT device, mouse or a keyboard I reckon. Otherwise on the USB, no chance... or?
Posted 24 April 2013 - 08:17 PM
Posted 24 April 2013 - 09:48 PM
I was wrong on the voltage, sorry! The standby voltage for ATX PSU (according to Wikipedia) is +5V, not +3.3V.
OK, so if the circuit i powered permanently on the real mac, then i could as well put it on the standby 3,3v on my PSU too?
http://en.wikipedia....unit_(computer) See the 24-pin connector diagram.
I hope I can solve it somehow differently?
You can check how much current can be supplied per rail (Max value) on your PSU. It has a sticker with that info. Usually Molex CAN supply much more than 0.5A. The question is how much current the BT model need and does it have a current limiting circuit on-board? If it doesn't, then you'd need a some sort of resistors to limit the supplied current to the value needed.
however, does molex also supply 500mA?
Posted 24 April 2013 - 09:56 PM
I'll see about the molex, however the best solution would definitely be a sata connector, if I could somehow just put the wire in to tap the 3,3v... hmmm...
Posted 24 April 2013 - 10:36 PM
Posted 25 April 2013 - 05:19 AM
If you have a dead SATA HDD/dvd drive around, then a male to female SATA connector could be made. Or you can use this one
http://www.ebay.co.u...=item4399d98d6a (minde the price ) There are probably more affordable options, just bother to search the ebay/internets...
Yeah, I bothered, and thanks for finding this. I actually had an idea of buying a male/female sata power extension cable, should be easy to find, for couple of €, and then just cutting off the connector, connect to the psu sata, and use the 3,3v cable...
Posted 02 May 2013 - 07:29 PM
put on to a old wifi card backplate. with some help of a bit of screenwash bottle and velcro and a zip ties
COST: Nothing (just a bit of brain power)
Not on Ebay. BUY NOW PRICE: A mansion in Beverly Hills and a V10 FORD MUSTANG (Joking)
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