OESF Portal | OESF Forum | OESF Wiki | LinuxPDA | #planetgemini chat on matrix.org | #gemini-pda chat on Freenode | #zaurus and #alarmz chat on Freenode | ELSI (coming soon) | Ibiblio


Welcome Guest ( Log In | Register )

> C1000,c3xxx Stereo In, Internal Mic, Wifi, Bt, ...from angstrom mailing list
post May 13 2008, 11:32 PM
Post #1

Group: Admin
Posts: 3,560
Joined: 29-July 04
From: Cambridge, England
Member No.: 4,149

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


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:

* I am not on the dev's list as I got fed up with the bitching
Go to the top of the page
+Quote Post
Start new topic
post May 14 2008, 02:24 AM
Post #2

Group: Members
Posts: 135
Joined: 27-June 05
From: Prague, Czech Republic, Europe
Member No.: 7,468

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)
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 thumbnail(s)
Attached Image
Go to the top of the page
+Quote Post

Posts in this topic

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:


RSS Lo-Fi Version Time is now: 22nd June 2018 - 03:21 AM