I tried a 1Mohm and 500Kohm res to pin 21 and still no diffference.

I have one sitting here, but sadly getting it open without destorying it will be a trick. It looks like the rubber bottom is glued down. I need to leave for a bit, but if I or someone else can find an iPhone dock teardown tutorial, I'd be glad to measure the pull down resistance on pin 21. Just specify which ground you want. USB and Audio share the same ground on this thing (which I don't know if that's a problem or not - I should probably check that on the official dock too...we may need to cut a trace so we have two separate grounds) and Firewire ground.

Bah, my probes are too big. I got my dock open (not a light task, you'll tear it up pretty good), and the only thing I have found so far is that pins 15 and 16 on the cable side are connected to the connector's ground, but with 100ohms of resistance. The only evidence I have that audio ground is connected to the connector's ground is on the underside of the board, where the audio jack hooks up. There's a test point that lines up with where ground should be, and holding a probe there and to the connector's shield I get full continuity. I can't find a good test point for pin 21 though.

Okay, so pin 30 has 100 ohms of resistance from the connector's ground. On the D650, that value is 0, so I think we can safely say something is amiss there.

I'm showing over 1Mohm of resistance on pin 29 on my D650, but I think that's just my lousy soldering again. Can you confirm that? It may be that we need to lift those pins and put a 100ohm resistor in between?

Yeah, I kinda figured that. it's gotta be either the firewire ground being tied in, or the serial pins. I'll let you know as soon as I get my podbreakout. It was on backorder, so we'll see...

On the actual dock, pin 21 to pin 11 (serial ground) shows 2.8Mohms. 21 to pin 30 is 360k, 21 to 29 shows open line (no connection), and 330k resistance to the connector ground from pin 21.

Someone with a steadier hand and better probes than me needs to verify this stuff. I taped needled to my probes and I'm testing with those.

Man, I'm starting to think the podbreakouts are permanently out of stock. This is kinda silly..

sorry. I don't have a dock to try. I guess I can try to make the resistances the same as what you just found. What's really weird is that people sell these adapters that work with the iphone and all the other ipods. I don't know how they make that work since it takes different resistance levels to activate accessory mode.

Sheesh. The PodBreakout *finally* showed up this past weekend, so we'll see what's what this week.

Finally here the final solution for Audio out cables, and the D650

Finally Audio Line out and Motorola D650 Bluetooth dongol working for the iPhone 3G - GSM-CAFE


Enjoyyyyyyyyyyyyyy

edit: Forget it, I was able to get the file...

Has anyone here performed this mode?