This board fix volume problem(random volume) on audi concer1/chorus1 head units made by BlaupunktDesigned by Tomas Kovacik in Slovakia
Due to the covid19, there are limitations where can I ship packages by Slovak post (https://www.posta.sk/stranky/obmedzenia-a-upravy-v-medzinarodnej-poste)
from hobbyist for hobbyists
What is it? It is a small board (with three order options (also different prices) read below about options prior order please) that is designed to be connected on top of the original processor of A...Read More…
It is a small board (with three order options (also different prices) read below about options prior order please) that is designed to be connected on top of the original processor of Audi first generation (with cassette deck) of Concert or Chorus radios. Communication between the main processor of the radio and the sound processing chip is severed and is routed to this module, which then fixes random volume jumps (or rather we should say, completely controls it).
These are 100% compatible, manufactured by Blaupunkt:
Maybe for these, drop me a message with pictures of radio from outside and inside, and I can check if your radio is compatible with this module:
Audio Concert made by Panasonic/Matsushita (8L0 035 186A, possible other codes ).This radio from this manufacturer did not have problems with volume (if it has, the problem is in volume rotary encoder)
There are other radios manufactured by Blaupunkt called Audi Concert Plus, which are not compatible:
These use a different design and so are not compatible with this module. I never read that these radios did have a volume problem. If there is one then it is most likely a problem with volume rotary encoder.
Original head units in old audi (Chorus1 and Concert1 made by Blaupunkt, Panasonic model is not affected) suffer from storing volume in eeprom for long time, some radios have more then 20years, and writing actual volume value at each step of volume knob has some consequences. If eeprom cell is damaged and temperature conditions are not good (low temp), reading this cell will return the wrong value, main cpu then calculate next value of volume based on this stored value, which results in unpredictable results as volume goes to max or min in one step. This module reads all data sent from the front panel, a act based on received data. It checks if we turn the volume knob up/down (ignores it if we are in balance/fade/treble/bass mode) and sends correct volume data to sound processor. For more detail check source code on github here.
Installation requires de-soldering of 2 SMD resistors on I2C line to the TDA sound processor, see pictures.
Then solder wire from pin SDA to left pin on position where lower resistor was,looking from panel side of radio (yellow wire in next picture), and wire which goes from SCL pin on module to left pin on position where upper resistor was (red wire in next picture). Make cables short as possible, this picture is not example how it should be, but never the less it's works fine for me :), this is current setup i run in my daily car, ignore any other cables in this picture, these are for development (USB in this case) and they are not required for normal operation of module, in case you do not want to hack it ;) (but contributions to code are always welcomed at github)
Then place module on top of Motorola MCU and fix it with hotglue/superglue/what ever (you can use screwed tape drive + some sort of spacer to hold module in place while glue is drying)
(check picture below for actual package content)
KIT mean set of PCB, components, flashed stm32 MCU, 2 crystals soldered on PCB, this kit need soldering, it can be done by soldering iron: PLCC52 connector(after cutting inner bottom plastic part, need to be cut anyway for good contact with main head unit mcu, this is not cut in advanced for shipping purposes),See this assembly guide.Then continue with stm32 chip, bunch of passives, mostly in 0805 package or bigger.
Fully assembled module is assembled board with components like on pictures.
Only PCB is only PCB without any components.
|Shipping Rate||Ships From||First item||Additional items|
Slovak Post: 1st class Ground Rate
Slovak Post: 1st class Registered Mail
Slovak post price list: https://cennik.posta.sk/en Original site with information about restrictions due to covid-19: https://www.posta.sk/stranky/obmedzenia-a-upravy-v-medzinarodnej-poste google translate to english: https://translate.google.com/translate?sl=sk&tl=en&u=https%3A%2F%2Fwww.posta.sk%2Fstranky%2Fobmedzenia-a-upravy-v-medzinarodnej-poste
Údržba | May 6, 2020
Taranu | Jan. 8, 2020
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