How to enable CD changer input on audi chorus I
From
schematics, difrence between chorus and concert which has CD changer
input, is just few parts and enable CD-changer by coding as in here. Parts need to be soldered on main board to
enable are this:
Audio input filter:
C1407 2.2uF/10V(THT, 2.54mm)
C1427 2.2uF/10V (THT, 2.54mm)
C1424 820pF (SMD 0805)
C1404 820pF (SMD 0805)
R1401 10kΩ (SMD 0805)
R1421 10kΩ (SMD 0805)
R1402 10kΩ (SMD 0805)
R1422 10kΩ (SMD 0805)
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| Location of all components on bottom side of PCB. |
Power supply switch:
R2018 150Ω (SMD 0805)
Location of 150Ω resistor is on first picture.
Comunication lines Data-In, Data-out, clock
R5301 1kΩ (SMD 0805)
R5304 1kΩ (SMD 0805)
R5305 1kΩ (SMD 0805)
R5202 2,2kΩ (SMD 0805)
R5303 2,2kΩ (SMD 0805)
V5301 BC848B any BC848/850 is ok
V5302 BZX84C5V6
V5303 BZX84C5V6
V5304 BZX84C5V6
Location of 3x1k and 2x2k2 is on first picture.
Price for this components is 0.68€ at gme.sk.
After this, you need CD changer emulator
and simple circute, which emulate "mode" button press. For so small
project is perfect attiny25/45/85 actualy 85 is cheapest one. For attiny
support in arduino, follow this tutorial. Sketch for tiny:
Schematic and pcb for this "mode button emulator":
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| schematics |
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| PCB |
Hello!
ReplyDeleteCould you please give me your facebook? I am interested in this, wanna make a flow meter to my mechanical tdi, audi a8, with the same odo controller. Thanks, Gábor from Hungary. https://www.facebook.com/gabor.fulop.10
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ReplyDeleteHi there! Thank you for your blog :)
ReplyDeleteDo you happen to know that if there is at all a phone module input controller -chip- in an AUDI A3 head unit and if there is, how to change a Chorus or a Concert II (2DIN)'s chip?!
Thank you so much!
sorry I do not understand what you try to ask.:(
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