What is the current draw on this device, at say 12V max volume both channels?

The operating current changes as the music is played, and the volume has a big impact. The maximum is about 100mA

Sound files on this chip are triggered by connecting gnd to one of the #d holes. is it safe to leave this wire connected permanently for loop play?

The spec sheet doesn't say whether it is safe to do this or not. I would monitor the setup for a while to ensure there are no overheating problems.

Can this device be set in continuous playback mode. And how simply do you do that?

Yes. Set the device into IO Independent mode 0 or 1 using the red DIP switches. Load your mp3 or wav file onto a TF ( micro SD ) card and name it 1.mp3 or 1.wav. Insert the TF card, power up the device, and connect IO pin 0 to ground. File 1.mp3 or 1.wav will play until IO Pin 0 is removed from ground. If you set the device to Independent Mode 0, the device will continue playing the current song to the end of the file after releasing IO Pin 0 from ground. If you set the device to Independent Mode 1, it will stop playing immediately after the releasing IO Pin 0 from ground. Hold IO Pin 0 to ground for continuous playback of song "1". Google for the DY-HV20T manual for technical details. Good luck!

How so I wire a switch?

If you look on the amazon listing. It shows 8 switch connection points that you can individually connect to the ground connection to play 8 different sounds. They need to be saved and downloaded with the 8 proper names in order to work. Just a tip, to get good sound out you need to connect to computer speakers.

Voice Playback Module | Desertcart Madagascar

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Description

🎵 Elevate your sound game — DIY audio mastery at your fingertips!

PLUG PLAY USB DOWNLOAD - Effortlessly update and manage your audio files via USB, making content refresh a breeze without technical hassle.
POWERFUL 20 W AMPLIFICATION - Crystal-clear sound output with built-in Class D amplifier, perfect for direct speaker connection without extra gear.
CUSTOMIZABLE VOLUME CONTROL - Built-in potentiometer lets you fine-tune audio levels to suit any environment, from intimate setups to broadcast-grade sound.
VERSATILE MULTI MODE CONTROL - Choose from 7 control modes including UART and one-line control for seamless integration with your embedded systems or DIY projects.
MASSIVE 32 GB STORAGE CAPACITY - Store and instantly access hundreds of MP3 tracks via TF card, ensuring your audio content is always ready to play.

The PEMENOL 20W Voice Playback Module is a versatile sound board designed for professional and DIY audio projects. Featuring a robust 20W Class D amplifier, it supports MP3 and WAV playback from a TF card up to 32GB. With seven control modes including UART and one-line control, it integrates smoothly with embedded devices. USB connectivity allows quick file updates, while adjustable volume ensures perfect sound levels. Ideal for broadcast devices, musical instruments, and custom electronics, this module empowers millennial professionals to create immersive audio experiences with ease.

Specifications

ASIN	B0B9H91ZBP
Best Sellers Rank	#10,066 in Musical Instruments ( See Top 100 in Musical Instruments ) #13 in Sound Modules #3,426 in Music Recording Equipment
Brand	PEMENOL
Compatible Devices	Personal Computer
Customer Reviews	4.2 4.2 out of 5 stars (78)
Digital Recording Time	23 hours
Format	MP3 Audio, WAV
Hardware Interface	USB
Headphones Jack	3.5 millimeters
Manufacturer	PEMENOL
Memory Storage Capacity	32 GB
Mfr Part Number	GY17437
Microphone Form Factor	Built-In
Microphone Operation Mode	Mono
Model Number	GY17437
Number of Items	1
Unit Count	1 Count

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