Need help building a mp3 player with push button volume control.

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protocol217

Member

• Sep 3, 2015

• #21

I am using program audacity, it has an option to convert stereo to mono, but when i play stereo mp3 file an my mp3 player/amplifier that i have build it is also working fine.

question about battery that i forgot: do i must this battery always store to stand normally, or can i flip it to lie on the side and stay like that always and when charging also ?

 

audioguru

Well-Known Member

Most Helpful Member

• Sep 3, 2015

• #22

Your big, heavy and old fashioned lead-acid battery is sealed and says "unspillable" so it can lie on its side if you want.

 

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protocol217

Member

• Sep 10, 2015

• #23

Hello again, everything works fine, but i have a question about this mp3 module: mp3-tf-16p
in the datasheet i see it has a play mode to play from microSD card and from Flash, but i don't understand does the flash mean a Flash memory USB stick or does this player have integrated memory ?

 

audioguru

Well-Known Member

Most Helpful Member

• Sep 10, 2015

• #24

It is difficult to read Chinglish. I think the MCU that controls it has the memory in it.

 

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protocol217

Member

• Sep 10, 2015

• #25

Here is a datasheet in English: https://www.dfrobot.com/image/data/DFR0299/DFPlayer Mini Manul.pdf
**broken link removed**

on the pinout picture there is USB+DP and USB-DM
I think that is for USB stick, am i right, if yes can the USB stick be powered from 4 volts ? I am powering this mp3 module with 4 Volts, so i am wondering can a USB stick also work on 4V?

 

Last edited: Sep 10, 2015

audioguru

Well-Known Member

Most Helpful Member

• Sep 10, 2015

• #26

The Chinese datasheet does not say anything about the USB pins and does not show them being used for anything.

 

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protocol217

Member

• Sep 10, 2015

• #27

I have soldered on a USB stick on the 2 USB pins from mp3 module, and give the same power that is mp3 module using to USB stick (4V) and it works, it reads songs from USB stick, BUT not every usb stick works, only one SANDISK 8gb works and a USB microSD card reader with a card also works.