Count me in for 2 boards.
Announcement
Collapse
No announcement yet.
CM5908/5907 Plug-n-Play Bluetooth upgrade board
Collapse
X
-
Last edited by bradnic; 03-19-2017, 06:35 AM.I BUY/SELL REFURBISHED CM5907s & CM5908s
HOWTOs:
DB vert plastic bumpers
OEM Keys
MTech1 docs
88 ix Lach/Card
91 ic Calypso 3.1
86 Cosmo 2.7
OEM+ or bust!
reelizmpro: I will always be an e30 guy.. I still do all of my own labor
TrentW: There's just something so right about a well-built M20 in an E30
e30m3s54turbo: I save my money for tuner parts.
-
Update us!Build Thread
https://www.r3vlimited.com/board/sho...d.php?t=419655
Parts Thread
https://www.r3vlimited.com/board/sho...d.php?t=408302
Comment
-
Still working on it! Been super busy with work lately working long hours, so time on this has suffered, but certainly not stopped. It's also been a real PITA working with this CSR chip. I've pretty much figured out its quirks at this point but for awhile I was having huge troubles reliably reading/writing the EEPROM that configures the BT chip and (now I realize) mistakenly thought I kept frying the chips.
Anyway, my hope is to get a video up this weekend of it working. Pretty much all the buttons are doing the right things now according to that original faceplate pic I put up. Mic input and phone calls are working. The last thing I have to work through is the analog audio out. I've got it working, but there is digital noise in the output that's higher than I'd like, so next I'm seeing what I can do to eliminate that. The BT chip has differential outputs, then I'm using a TPA6132A headphone amp for the single-ended conversion. When I plug the output of the chip into headphones, the SNR is great, but when plugged into the stereo, the digital noise is present. I'd guess it's like -50 dB down from full scale signal, but it's there. I'm going to try running a separate 3.3V regulator just for the headphone amp with a separate ground path from the rest of the circuit, but any advice is appreciated :)
Comment
-
you are powering the whole test rig with an actual battery and not a power supply right?I BUY/SELL REFURBISHED CM5907s & CM5908s
HOWTOs:
DB vert plastic bumpers
OEM Keys
MTech1 docs
88 ix Lach/Card
91 ic Calypso 3.1
86 Cosmo 2.7
OEM+ or bust!
reelizmpro: I will always be an e30 guy.. I still do all of my own labor
TrentW: There's just something so right about a well-built M20 in an E30
e30m3s54turbo: I save my money for tuner parts.
Comment
-
Originally posted by bradnic View Postyou are powering the whole test rig with an actual battery and not a power supply right?
Comment
-
it probably introduces noise. best to try a battery source to make absolutely sure.I BUY/SELL REFURBISHED CM5907s & CM5908s
HOWTOs:
DB vert plastic bumpers
OEM Keys
MTech1 docs
88 ix Lach/Card
91 ic Calypso 3.1
86 Cosmo 2.7
OEM+ or bust!
reelizmpro: I will always be an e30 guy.. I still do all of my own labor
TrentW: There's just something so right about a well-built M20 in an E30
e30m3s54turbo: I save my money for tuner parts.
Comment
-
Originally posted by jaysterling View PostTurns out using a separate power supply and ground path totally fixes the digital noise issue like I hoped.
So it's all working now! I just made a short demo video with everything buttoned up inside and functioning. Still work to go but it's getting close.
Comment
-
Home run brother. Ready to paypal you for the units i requested earlierI BUY/SELL REFURBISHED CM5907s & CM5908s
HOWTOs:
DB vert plastic bumpers
OEM Keys
MTech1 docs
88 ix Lach/Card
91 ic Calypso 3.1
86 Cosmo 2.7
OEM+ or bust!
reelizmpro: I will always be an e30 guy.. I still do all of my own labor
TrentW: There's just something so right about a well-built M20 in an E30
e30m3s54turbo: I save my money for tuner parts.
Comment
-
Originally posted by bradnic View PostHome run brother. Ready to paypal you for the units i requested earlierBuild Thread
https://www.r3vlimited.com/board/sho...d.php?t=419655
Parts Thread
https://www.r3vlimited.com/board/sho...d.php?t=408302
Comment
-
Originally posted by jaysterling View PostTurns out using a separate power supply and ground path totally fixes the digital noise issue like I hoped.
So it's all working now! I just made a short demo video with everything buttoned up inside and functioning. Still work to go but it's getting close.
Comment
-
Beautifully executed.
I am in for a few I think.Originally posted by codyep3I hope to Christ you have looks going for you, because you sure as fuck don't have any intelligence.
1988 Blk/Blk e30 factory wide body kit car SOLD
1992 DS/BLK 325 m-tech II apperance pack cabby SOLD!
2002 325xit Sil/blk. SOLD
2012 328i xdrive touring. Wht/blk. SOLD
2009 135 cabby. monacoblue/blk leather SOLD
2007 Z4m coupe. Silver grey/black/ aluminum. 1of50
2010 F650gs twin
2016 M235i cabby. Mineral grey/Red leather
Comment
-
Most days I feel like a fairly intelligent person until I read a thread like this and feel like a moron. I mean, amazing accomplishment but stop showing off already. ;)
So, even though you are kind of being a dick by making us look like comparative neanderthals I really would like to give you money now for this witchcraftery.
Is it ready yet?
How about now?1989 BMW 325is Coupe - Alpine White
Comment
Comment