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

Product ID: 77675633

Details

Audio output mode
Stereo
Brand
innomaker
Compatible devices
Raspberry Pi 4
Hardware interface
PCI Express x1
Platform
Linux

⚡Up to 90% Efficiency

🎧100dB Signal-to-Noise Ratio

🔊25W Class-D Power

$107.97

Duties & taxes included

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Description

🎶 Elevate your Raspberry Pi audio game—because your playlists deserve premium power!

AUDIOPHILE GRADE SOUND - TAS5713 amplifier delivers crystal-clear, low-distortion stereo output.
BROAD SOFTWARE SUPPORT - Compatible with top music players like Volumio, RuneAudio, Moode, and Debian.
PLUG PLAY HI FI UPGRADE - Seamlessly connects via 40-pin GPIO—no soldering or cables needed.
POWER EFFICIENT ROBUST - Supports 4Ω speakers with up to 90% efficiency for long-lasting performance.
UNIVERSAL RASPBERRY PI COMPATIBILITY - Works flawlessly with Pi 5, 4, 3B+, Zero, and more.

The InnoMaker RPI HiFi AMP HAT is a 25W Class-D amplifier module designed for Raspberry Pi models 5, 4, 3B+, and Zero series. Featuring the TAS5713 chip, it delivers high-fidelity stereo sound with a 100dB signal-to-noise ratio and supports sample rates up to 48kHz. This plug-and-play expansion board requires no soldering, supports a wide range of music player software, and offers up to 90% power efficiency, making it the perfect upgrade for audiophiles and Raspberry Pi enthusiasts seeking premium sound quality.

Specifications

ASIN	B07CZZ95B9
Audio Output Mode	Stereo
Best Sellers Rank	74,236 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 337 in Hi-Fi Amplifiers
Brand Name	innomaker
Compatible Devices	Raspberry Pi 4, Raspberry Pi Zero, Raspberry Pi Zero W, Raspberry Pi 3B, Raspberry Pi 3B+
Customer Reviews	4.2 4.2 out of 5 stars (169)
Hardware Connectivity	PCI Express x1
Hardware Platform	Raspberry Pi
Manufacturer	innomaker
Manufacturer Part Number	RPI-HIFI-AMP
Maximum Sample Rate	48 KHz
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	2.0
UPC	606462078979
Unit Count	1.0 count

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