TDA2822M based amplifier

[luke10050]

i have a cheap project kit based around the TDA2822M IC from ST Micro. and was wondering about the effect of 4.7uF polymer capacitors placed in parallel with the 470uF capacitors, as i replaced the capacitors near the input with polymer caps and the sound quality improved markedly.

i also replaced the stock 470uF capcitors with Panasonic FJS caps.

if anyone has some decent links to the use of these capacitors it would be immensely appreciated too...



Link To Kit: https://www.kitronik.co.uk/c2141-del...ifier-kit.html

yeah, i know its bad, but its something to tinker with and figure out why it sounded so bad stock

[luke10050]

Re: TDA2822M based amplifier

Also, what would the effect of substituting the 470uF caps for 1000uF caps? P.s. i'm using 3 ohm LG speakers

[stj]

Re: TDA2822M based amplifier

i cant see a schematic on that page.

[luke10050]

Re: TDA2822M based amplifier

Will provide, its basically the reference design from the datasheet

Edit: added photo

[mariushm]

Re: TDA2822M based amplifier

You have the official datasheet for tda2822m is here :

https://cdn.badcaps-static.com/pdfs/...a2f1c7e5d0.pdf

The link you gave also has some pdf files with good information.

Can't figure out what you're talking about with those 4.7uF capacitors, don't see anything like that in the circuit and schematics.

The 470uF capacitors are on the output, to prevent speakers from blowing up due to the idle voltage.
The capacitance there is like a low pass filter, anything below some frequency (let's say 00 Hz) gets removed.
Higher capacitance there just means you'll get more low frequency noise, more bass.. but depending on the quality of the amplifier the extra sound could be just garbage.

The amplifier chip is not so good that you would notice the difference between capacitor types on the output, I suspect it's just placebo or something like that.

[luke10050]

Re: TDA2822M based amplifier

Thanks for your input mariushm, is there anything that would change the sound quality? I feel it sounded better after i changed the two 100uF caps, as it does give me a weird feeling listening to it. Just curious.