Will this board supply power back to the Raspberry Pi through the 50 pin connector?

Yes, the board has a step down converter (MP2403) that powers the Pi through the GPIO connector (which is 40 pins...) I power mine with a 19v laptop supply and it works very well.

How does this interface with the pi? i2c/spi something else?

hi，Glad to answer your question：The Amp works with all Raspberry Pi models with the 40-pin GPIO connector，uses IIC PINS， you can see the detail of the TAS5713PHPR

Will not be used with pi. need to know which pins accept i2s input. can i download user manual?

Manual can be found here http://www.inno-maker.com/product/hifi-amp-hat/ and it does list the pin usage.

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RPI HiFi AMP HAT TAS5713 Amplifier Audio Module 25W Class-D Power Sound Card Expansion Board for Raspberry Pi 5 4 3 B+ Pi Zero Nichicon Capacitor

Product ID: 73644315

Details

Audio Output Mode
Stereo
Brand
innomaker
Hardware Interface
PCI Express x1
Platform
Linux

⚡Up to 90% Efficiency

🎧Supports 4Ω Stereo Speakers

🔊25W Class-D Power

VT12424

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Description

🎶 Elevate your Raspberry Pi audio game—because your ears deserve the best!

EFFICIENT POWERFUL - Up to 25W output with 90% efficiency ensures rich sound without draining your Pi’s power.
AUDIOPHILE GRADE SOUND - TAS5713 amplifier delivers low distortion and crystal-clear stereo audio.
PLUG PLAY HI FI UPGRADE - Seamlessly connects to Raspberry Pi via 40-pin header—no cables or soldering needed.
WIDE SOFTWARE ECOSYSTEM SUPPORT - Compatible with OSMC, Volumio, RuneAudio, Moode, and more for ultimate music flexibility.
UNIVERSAL RASPBERRY PI COMPATIBILITY - Works flawlessly with Pi 5, 4, Zero, Zero W, 3B, and 3B+ models.

The RPI HiFi AMP HAT features a 25W Class-D TAS5713 amplifier designed for Raspberry Pi models 5, 4, Zero, and 3 series. It plugs directly into the Pi’s 40-pin header, requiring no extra cables or soldering, and supports a wide range of music player software. With up to 90% efficiency and support for 4Ω stereo speakers, it delivers high-fidelity, low-distortion sound for audiophiles and makers alike.

Specifications

ASIN	B07CZZ95B9
Audio Output Mode	Stereo
Best Sellers Rank	#103,403 in Electronics ( See Top 100 in Electronics ) #632 in Audio Component Amplifiers
Brand	innomaker
Compatible Devices	Raspberry Pi 5, Raspberry Pi 4, Raspberry Pi Zero, Raspberry Pi Zero W, Raspberry Pi 3B, Raspberry Pi 3B+
Customer Reviews	4.0 4.0 out of 5 stars (179)
Hardware Connectivity	PCI Express x1
Hardware Platform	Raspberry Pi
Manufacturer	innomaker
Maximum Sample Rate	48 KHz
Mfr Part Number	RPI-HIFI-AMP
Model Number	RPI-HIFI-AMP
Number of Items	1
Number of Packs	1
Platform	Linux
Signal-to-Noise Ratio	100 db
Surround Sound Channel Configuration	2
UPC	606462078979
Unit Count	1 Count

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