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Author Topic: Digital audio control with Atmega8 + Tda7439 + 3310lcd  (Read 9868 times)
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tekniker_erhan
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« on: October 23, 2009, 03:30:24 03:30 »

Hi all I'm sharing my new project with you
I use atmega8 3310 lcd and tda439 for audio control I write codes with free winavr c compiler circuit control menu+-,+-and mute keys and philisp rc5 compatible comander values store on internal eeprom circuit have a jumper for lcd display invert or normal mode for programing I'm using isp connector you can watch and download test videos and you can download all files you can ask me any lead problem and request with project

File pass:tekniker_erhan

All project files

Youtube test video

For download test video click here











« Last Edit: October 28, 2009, 06:16:23 18:16 by tekniker_erhan » Logged
0815achim
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« Reply #1 on: October 23, 2009, 07:07:03 07:07 »

Nice Project!

And thank you for sharing it.

Greetings... 0815achim
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riteshjain_82
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« Reply #2 on: October 23, 2009, 07:44:08 07:44 »

what a great stuff
i just want to know that how many ch the TDA7439 support
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tekniker_erhan
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« Reply #3 on: October 23, 2009, 02:47:04 14:47 »

Thanks friends tda7439 support 4 stereo ch you can see and learn from datasheet

http://www.datasheetcatalog.org/datasheet/stmicroelectronics/4291.pdf
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tekniker_erhan
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« Reply #4 on: October 23, 2009, 04:41:48 16:41 »

I reuploaded files because software have a little mute problem mute exactly the tone does not cut correction of the problem and I reuploaded the files if you see any problem for project report me I correct
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deveshsamaiya
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« Reply #5 on: October 28, 2009, 05:59:23 17:59 »

the projects file archive is password protected...plz tell us the pass...thank you
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embedded@iit
metal
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« Reply #6 on: October 28, 2009, 06:25:04 18:25 »

Excellent project, but I will never use such an a chip to control sound, distortion always adds the more you add controls. IR code can also be found at AVRfreaks.net, I tried my best to tidy that code, ported this code to Crossworks as well:

http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=58645
http://www.youtube.com/watch?v=ghSOHPLVSvw

But be careful, you write too much to the EEPROM and will end up with a broken AVR sooner or later. You better adopt another mechanism to save values at switch off, this is better and will save your EEPROM's life, trust me I had this situation before.

You could also think about something like this:
http://diyaudioprojects.com/Solid/DIY-Lightspeed-Passive-Attenuator/  Think about how to use a digital potentiometer to control these optocouplers, something like PGA and DS chips with OPA2134 as a buffer for the digital POT will be ok.


This project is also useful: http://www.scienceprog.com/avr-based-tda7313-audio-processor-control/
« Last Edit: October 28, 2009, 08:02:34 20:02 by metal » Logged

nothing to say..
tekniker_erhan
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« Reply #7 on: October 29, 2009, 05:04:40 17:04 »

hi tda7439 is professional chip many companies use this chip on consumer products if you dont like digital control you can use analog potentiometer or you have better project you can share with us ,logic error in the code may but project tested by me and project works well sound not have anormal distorsion with normal gain values and I've done same project with ds1844 digital potentiometer if you want you can make this
http://www.sonsivri.com/forum/index.php?topic=23338.msg80185#msg80185
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