This board fix volume problem(random volume) on audi concer1/chorus1 head units made by Blaupunkt
Designed by Tomas Kovacik in SlovakiaSign up to get notified when this product is back in stock!
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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 Aud…
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 and solder two wires in their place, see next picture,
Then place the module on top of Motorola MCU put some cardboard on top of it, screw-down tape deck and test it, if all works fine you can sam CA glue between the module and Motorola mcu to fix it permanently. But you can leave it just with cardboard, I use it like that in my daily without problem. Complete guide with disassembly is here.
Nothing is ideal, check if any problem showed up in issues on github or report if you found problem with this module here.
(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.
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