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DIY bluetooth speaker

I need data on this:


What i need is at what voltage i get what wattage. Since i got BMS and charger for 5S, maybe i could use my stepup.
 

audioguru

Well-Known Member
Most Helpful Member
The Chinese amplifier module uses the new TDA7492P Rev6 version and is missing a heatsink on its bottom. The datasheet for this version shows 25W + 25W at 10% horrible clipping distortion into 8 ohms when the supply is 20V. As usual, ebay is wrong.

All the graphs do not show a supply higher than 20V.
At low distortion the power is 18W per channel into 8 ohms. If this power is continuous then the IC might shut down due to overheating.
 

audioguru

Well-Known Member
Most Helpful Member
This thread is too long, I cannot remember which IC version and which power supply voltage your last amplifier used.

The old Rev5 amplifier IC had its thermal pad on top for a heatsink attachment and with a 25V supply and 8 ohm speakers, produced 2 x 40W with horrible 10% distortion, about 32W per channel at 1% distortion and about 27W per channel at low distortion. With a 22V supply, it could produce 2 x 50W into 4 ohm speakers at 10% horrible distortion and produce about 37W per channel at low distortion.

10 times the power sounds twice as loud. 2 times the power is only a little louder but you will not notice if you do not quickly switch the 1times and 2times powers back and forth quickly.
 

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