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Apple Bluetooth Module


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#1
Kosta88

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We got any electrical engineers here? :) I am definitely not one, and trying to not to damage my BT dongle.

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.

My questions:

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?

#2
3.14r2

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http://www.insanelym...uetooth-module/

#3
Kosta88

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OK thanks, however I didn't get diodes, but the voltage regulator. According to the guy in the store, this should do well too... my only question is if I need anything else but the voltage regulator?

#4
3.14r2

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All PSUs should have a stand-by voltage which is +3.3V. So it should be (in theory) OK to use it. The other question is whenever it is good idea for the module to be powered constantly (as a stand-by voltage is supplied even if a PC is turned off). The conversion route (+5V --> +3.3V), IMO would be a safer way to go.

my only question is if I need anything else but the voltage regulator?

I guess no. It should be enough. It's not a CPU after all :)

#5
Kosta88

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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?

#6
3.14r2

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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?

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).

#7
Kosta88

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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? However finding a free SATA connector on my PSU might be a challenge, and I am not keen to cut the connector, I hope I can solve it somehow differently? I guess I could also put it onto molex, just put the wire into the connector, however I would need to use the voltage regulator again... however, does molex also supply 500mA?

#8
3.14r2

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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?

I was wrong on the voltage, sorry! The standby voltage for ATX PSU (according to Wikipedia) is +5V, not +3.3V.

I hope I can solve it somehow differently?

http://en.wikipedia....unit_(computer) See the 24-pin connector diagram.

however, does molex also supply 500mA?

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.

#9
Kosta88

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The 24pin is on the mobo, so patching in is giving me an itch.
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...

#10
3.14r2

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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...

#11
Kosta88

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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...

#12
BALDY_MAN

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heres some pic of my homemade bluetooth mod .
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) :angel_not:

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