TDA2003

This topic is for posting general questions and answers related to the info found in the High Fidelity Audio section above to KEEP THAT FORUM CLEAN! Only instructions, diagrams and schematics will be posted in the above section. PLEASE POST All YOUR QUESTIONS AND ANSWERS RELATED TO MODS SHOWN IN THE HIGH FIDELITY AUDIO SECTION HERE!
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redlght
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TDA2003

Post by redlght »

Which audio rx tx mod fits the cobra 29 NW LTD with the tda2003 audio ic? Thanks
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Goldfinger
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Re: TDA2003

Post by Goldfinger »

Both the older one and the TDA one are on the same thread: "Cobra 29 cap changes"
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redlght
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Re: TDA2003

Post by redlght »

I can not find C170 on my board and Q23 is not placed the same direction as the photo.
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Goldfinger
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Re: TDA2003

Post by Goldfinger »

On the radio's that have C170, the value is pretty high and cuts out a lot of highs. They keep changing the new 29's so yours may not have C170 or it's somewhere else completely. I'd just go ahead and do the rest of the mods and see how it sounds.
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redlght
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Re: TDA2003

Post by redlght »

This is mine it has a SMD cap on the solder side of board from the factory
29NWtda2003schem.pdf
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Goldfinger
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Re: TDA2003

Post by Goldfinger »

TDA cap.jpg
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That cap is part of the feedback circuit. Did removing it give it more highs?
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redlght
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Re: TDA2003

Post by redlght »

I haven't tired any changes yet, is the other 29 mod you stated still the one to use with this version?
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Re: TDA2003

Post by Goldfinger »

If your radio is the same as the schematic you posted then the cap changes would be the same as "New 2010/2011 Cobra 29LTD (TDA2003 audio chip)" but you ignore C125 and C43 as your 29 doesn't have them according to the schematic. The early TDA2003 boards must be different from the newer ones.
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Re: TDA2003

Post by redlght »

Will let you know. Thanks again
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