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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Raspberry Pi HiFi Amplifier 25W Class-D Power AMP Hat TAS5713 Audio Sound Card for Raspberry Pi 4 3 B+ Pi Zero Nichicon Capacitor

Product ID: 257359831

Details

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

⚡90% Efficiency

🎶Low Distortion

🔊25W Power

18.76 OMR

Duties & taxes included

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Description

🎧 Elevate Your Sound Experience!

HIGH QUALITY AUDIO - Experience acoustically accurate sound with the TAS5713 Class-D amplifier.
SEAMLESS INTEGRATION - Connects directly to Raspberry Pi with no extra cables or soldering required.
COMPREHENSIVE SUPPORT - Includes software, documentation, and friendly tech support for a hassle-free experience.
EFFICIENT PERFORMANCE - Enjoy up to 90% efficiency while driving 4 Ohm speakers.
VERSATILE COMPATIBILITY - Supports a wide range of music player systems and formats.

The innomaker Raspberry Pi HiFi Amplifier is a 25W Class-D power amplifier designed for seamless integration with Raspberry Pi models. It offers low distortion audio reproduction, supports a wide range of music systems, and operates with high efficiency, making it the perfect choice for audiophiles looking to enhance their Raspberry Pi audio projects.

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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