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DAU9 Notebook |
The "Don't try this at home!"-Statement:
All Information on this Site is without any warranty! You do
everything on your own risk! If anything described here sounds japanese to you, then don't
try it!
You may destroy your phone permanently!
YOU HAVE BEEN WARNED !
Allmost all DAU-9(P) circuits and descriptions on the web orginates from a Chech-Hacker. This
circuit derives power from two pins of the serial port with a 7805/78L05.
The 7805 requires, that the input Voltage is at least 2V higher than the output-voltage (makes 7V). Than there
are Diodes to get only the positive Voltage so, summing it up means, that the serial port has to
deliver at least 7,7 V for the circut to work.
This is not true for most Notebooks, since their signals are 5,5 - 6,5 V in most cases.
Some Vendors use Zehner-Diodes to get 5V, but this may draw to much power from the serial port.
My solution is, to use a 7802 and omit the 3 diodes. My tests showed, that 7802
really delivers about 2,5V which is perfect for Nokia phones, since the digital high-level is
defined between 2.0 and 2.8 V on a 6110. This is slightly below the recommended max3232 voltage,
but at least with the original max-IC it is working.
FOR PERSONAL USE ONLY
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If not otherwise marked: © Copyright 2000,2001,2002 Adrian Dabrowski. All rights reserved.
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NON-PROFIT USE ONLY
Please do not copy any information without permission.All you see on this Site costs time and money to find out, build it, try it and publish it. It would be very unfair to simply copy it.
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