Need help with my project. I am building a Wireless speaker using esp32 ,Max 98357 Dac Module , 5V stereo class D amplifier , and a 4ohm 3 watt speaker . In order to connect DAC output to amplifier how to do it . How to connect dac Differential output to amplifier input
Update:
Currently working with 20 watt speaker so need output suitable for that
Will this search help you? https://www.google.com/search?q=opamp+differential+to+single+ended
Note:
I'm not much of an electronics engineer.
it just opening a search history
No, it's just a set of links. Follow them to find out more. From A Low Power, Low Cost, Differential Input to a Single-Ended Output Amplifier | Analog Devices to give you the basics
Output of what? Post a link to the product page or data sheet of the item.
Here is a simpler differential amplifier. You probably don't need any gain and in that case all 4 resistors can be 10K.
Note that this circuit "expects" dual plus & minus power supplies (like most op-amp circuits).
Hi,
The only reason that the amp has differential output is to provide the widest voltage swing across the speaker.
Its called bridge driving a speaker.
The difference in the two outputs is 180deg phase shift, nothing else the audio information is the same.
So just using ONE of the outputs and feeding it to single ended input will work.
Depending on the input device, you may need a potential divider plus a decoupling capacitor. As the amplifier is single ended power supplied, will be outputting 0 to 5V p-p audio,
I may be wrong but read.
Tom.... 
Hi, @AresXT
Why do you want to feed the 3.2W output of the DAC to another 3.0W amplifier?
The DAC has a power amp on it?
Tom....
There is no need for the 5V class D amplifier, the Max 98357 can output 3W to a 4 ohm speaker
It is not loud enough i need more sound
Well the DAC is 3.2W, feeding the other amplifier will not ADD another 3.0W, your output power will go down.
Do you understand?
Tom....
Or is there any DAC module that can produce normal single line output without amplifier or can you suggest me a differential amplifier module which i can use for speakers of 4 ohm ,5w to 20 w
Yeah i tried that . What will be good option for me if i want to increase the volume of audio output
Instead of the 3W external amplifier, use a 20W external amplifier.
It will probably need a higher voltage power supply.
Tom....
By the way i have 18 watt amplifier module can i use this .it does not have any differential input though
You can use it but not with the MAX98357
You need to find a different DAC module with line level outputs or a DAC module with the power output you want.
The MAX98357 is not just a DAC, it is also a class D power amplifier that is meant to be connected directly to a speaker and not to any further analog circuitry.
Class D means that the outputs are driven with PWM. This is fine for the final power stage since the inductance and inertia of the speaker, combined with the frequency response of the human ear, will filter out the very high frequency digital PWM signal. However it is completely unsuitable to input it into other analog circuitry for further processing.
3.2W is going to be just about the maximum amount of power you're going to get output at 5V. You'll need an amplifier with a larger voltage supply to get more juice, like MAX98365 (as an example that looks closest in functionality to yours).
MAX98365 is not available in module with any affordable rate .Or do you guys have any other solution like any other DAC alternatives . Or can i feed the input of max98357 to an op amplifier
Do you have any recommendations on that
