Hello, 🙂
Could you please help in choosing a audio amplifier IC for building DIY home speakers (2.1 system)?
Whether to go for class AB amplifier like LM1875 or TDA7295. Or go for a class D/T amplifier like TPA3116 or TA2020 or TK2050 etc.
Looking at the datasheets of these class-AB and class-D amplifiers, the performance are looking similar, referring the graphs for THD+noice vs frequency and output power etc.
For all of these the THD was at least below 0.1% across the output power values under the given max for the chip. "THD vs Frequency" graphs were more smoother for TK2050, and LM1875 and on TPA3116 graphs THD was bit higher at around 5KHz region.
From what I have read, class-D is more efficient and so I may have a smaller power supply driving it and will have smaller or no heat sink. Thus a overall compact and small amplifier will result. But heard they have some EMI issues.
On the other hand with class-AB amplifier, sound quality will be very good and not sure if these currently available class-D amplifier are producing such sound quality. But they need bigger power supply as they are less efficient, and need a bigger heat sink, so overall it will be bit bulky.
Please help in selecting the suitable amplifier IC for DIY 2.1 channel home speaker system.
thanks and regards to all.
Could you please help in choosing a audio amplifier IC for building DIY home speakers (2.1 system)?
Whether to go for class AB amplifier like LM1875 or TDA7295. Or go for a class D/T amplifier like TPA3116 or TA2020 or TK2050 etc.
Looking at the datasheets of these class-AB and class-D amplifiers, the performance are looking similar, referring the graphs for THD+noice vs frequency and output power etc.
For all of these the THD was at least below 0.1% across the output power values under the given max for the chip. "THD vs Frequency" graphs were more smoother for TK2050, and LM1875 and on TPA3116 graphs THD was bit higher at around 5KHz region.
From what I have read, class-D is more efficient and so I may have a smaller power supply driving it and will have smaller or no heat sink. Thus a overall compact and small amplifier will result. But heard they have some EMI issues.
On the other hand with class-AB amplifier, sound quality will be very good and not sure if these currently available class-D amplifier are producing such sound quality. But they need bigger power supply as they are less efficient, and need a bigger heat sink, so overall it will be bit bulky.
Please help in selecting the suitable amplifier IC for DIY 2.1 channel home speaker system.
thanks and regards to all.
So you need 3 channels: stereo+bass
I would say go for LM1875.
Power output is more than you need.
A benefit is many built LM1875 and can give advice if you have any trouble.
If you go for 3xLM1875 in one box,
you need only one power supply.
Say +/-20 Volt or something like that.
I would say go for LM1875.
Power output is more than you need.
A benefit is many built LM1875 and can give advice if you have any trouble.
If you go for 3xLM1875 in one box,
you need only one power supply.
Say +/-20 Volt or something like that.
Hi mate,
I am trying to build is for home purpose, to connect it to my TV for movies and to my mobile for songs.
My TV is having 10w+10w speakers and if raised to high volume it gets sufficiently loud. So thinking a 20w+20w+20w speaker system will be sufficient. Please comment if my understanding on watts required is ok.
Regarding the power supply for the amplifier, thinking if i can use the 65w, 19.5v laptop power supply. Is it ok or its better to go for transformer based linear power supply?
Regarding speakers, I was thinking to use car speakers, as here we can get branded car speakers like from JBL, sony etc, with 4ohm, rms 30w, and 90 - 93db sensitivity (which seems to be good sensitivity which will give loud sound with relatively less power). With branded speakers we may trust the quality of the speakers(hope so)...
I am trying to build is for home purpose, to connect it to my TV for movies and to my mobile for songs.
My TV is having 10w+10w speakers and if raised to high volume it gets sufficiently loud. So thinking a 20w+20w+20w speaker system will be sufficient. Please comment if my understanding on watts required is ok.
Regarding the power supply for the amplifier, thinking if i can use the 65w, 19.5v laptop power supply. Is it ok or its better to go for transformer based linear power supply?
Regarding speakers, I was thinking to use car speakers, as here we can get branded car speakers like from JBL, sony etc, with 4ohm, rms 30w, and 90 - 93db sensitivity (which seems to be good sensitivity which will give loud sound with relatively less power). With branded speakers we may trust the quality of the speakers(hope so)...
Hi, since air coupling ( acoustic impedance) to the cone ( speaker's membrane )
is very inefficient, due to the long wavelenghts ( 20 Hz= 17 m) related to the small ( relatively ) cone that has to reproduce them, the power needed for the sub needs to be almost double.
🙄
is very inefficient, due to the long wavelenghts ( 20 Hz= 17 m) related to the small ( relatively ) cone that has to reproduce them, the power needed for the sub needs to be almost double.
🙄
If you want classAB, TDA8947 is a single chip solution for 2.1 : https://www.nxp.com/docs/en/data-sheet/TDA8947J.pdf
Then your system will be too low power, no better (if that much) than the built-in TV amplifier.
To justify the effort, you need to go one full step above or more.
You may use a larger chipamp (LM3886 or TDA7294) to send 50/60W to woofer and a couple LM1875 for Stereo/Satellites OR to simplify supply you can use *four* LM1875: two for Stereo and another two, bridged, to feed the woofer.
This kind of solution is quite popular because it´s simple and works well.
In any case with a proper power supply, whatever the datasheet recommends.
I'm in the middle of 2.1 tv/background music speakers project and chose sure wondom jab2 and jab3 class d amps with accessories. I wanted relatively cheap and fast to construct solution. Haven't received the order yet so can't comment how it turns out. As a bonus there is bluetooth receiver and battery pack/charger for garden parties and dsp for geeking out the system.
If you have a laptop power supply and want to use it, go for class D. And then a get a board like this:
TPA3116 2.1 50Wx2+100W Amplifier Board Digital Power 12-24V Super Bass Speaker | eBay
Saw a review about that and it didn't seem to be bad and the knobs actually do something useful. Then get sensitive enough speakers and you're pretty much done.
TPA3116 2.1 50Wx2+100W Amplifier Board Digital Power 12-24V Super Bass Speaker | eBay
Saw a review about that and it didn't seem to be bad and the knobs actually do something useful. Then get sensitive enough speakers and you're pretty much done.