C1000,c3xxx Stereo In, Internal Mic, Wifi, Bt, ...from angstrom mailing list Options

[speculatrix]

some discussion of hardware hacks came up on the angstrom user's mailing list* so I thought people here would be interested.

It began with an off-the-cuff remark by Stanislav Brebec about stereo audio input, I asked for more information. he explained that the Zaurus x000 series are capable of stereo sound input, it's just that Sharp decided to ground one of the inputs, here's the HOW-TO

http://lists.linuxtogo.org/pipermail/angst...May/001888.html

that message also goes on to discuss internal microphone, wifi and bluetooth - click on the "next message in thread" to see the follow-ons.

the hardware discussion then carries on in this thread:
http://lists.linuxtogo.org/pipermail/angst...May/001892.html


* I am not on the dev's list as I got fed up with the bitching

[utx]

It was me.

The WM8750 audio codec inside is capable of: 3 multiplexed stereo inputs (RINPUT3 is repurposed as headphones detection), two stereo outputs (dependent), two mono outputs.

Zaurus wiring:
LOUTPUT1/ROUTPUT1 -> Jack (additional mute transistors are present in the path)
LOUTPUT2+ROUTPUT2 -> Speaker
OUT3 -> unused, traced to testpad near the codec and near the "+" sign
MONOOUT -> unused, traced to testpad near the previous
LINPUT1 <- Jack
RINPUT1 <- completely wired audio path connected to ground
LINPUT2, RINPUT2, LINPUT3 <- unused, but traced somewhere on PCB
RINPUT3 <- repurposed as headphones detection

Non-audio hwmods in that mail have its own thread here.

Parts list for stereo in:
capacitor 220p/50V (SMD 0402/1005) BK
resistor 47k (SMD 0402/1005) J
a short wire

Part that will be removed:
one coil

See the image for my idea. It is possible, that there is an open position for a zero resistor somewhere for this modification.

Please note, that this hwmod is still only my theory. There is no success story yet.

Attached File(s)

 zaurus_stereo_in_draft.jpg ( 54.77K ) Number of downloads: 34