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It is currently 20 Feb 2018, 10:36

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 Post subject: Re: PAM8403 - 3+3W D-amp
PostPosted: 10 Jan 2018, 07:06 
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Joined: 02 Mar 2009, 12:41
Posts: 1031
Location: Vänersborg, Sweden
Almost cut my hai ... got my TPA3118 working perfectly the other day..
When having assembled it - two TPA3118 modules in a perfect chassis - it sounded awful. Highly distorted sound and no control of volume.
Now I soldered a 2200uF capacitor across the Vcc and Gnd and that removed all (or at least most) of the distortion. The modules have propably too much gain and I have seen somewhere that there's a resistor (SMD) on the boards that can lifted up with a hot soldering iron.

I will add some more microfarads and add resistors ins series with the input cables, if I cannot locate the magical gain-setting resistors. I used a smaller amp hooked up to my TV to get some heavier sound, and now I am using the TPA3118.

The modules are mono-amps, rated some 50W. Therefore two are needed for stereo.

Attachment:
TPA3118-02.jpg


Her attached to the telly and my vintage B&O bookshelf speakers (out of site). Garik Sukachev leader of the Russian band Neprikasaemie (Untouchables) is propably singing Watch TV.

Attachment:
TPA3118-01.jpg


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