I am going to show here an mp3 player with rechargeable battery
- with fm
- with aux in
- with earphone out
- with bluetooth
- with card reader player
- usb player
It was in idea that i think in a night.I had in my mind exactly this. Using a tablet or your mobile phone you can also use it as wifi radio!
Let’s begin with the mainbooard of the project . It is a Wireless Bluetooth that cost the unconscionably price of 6$. And yes it does all those. You can find it here
Project start with the box. I create it with skethup . You can download sketchup files i use here
And finally i paint it with acrylic paint
Let’s move to electronics now. I had many thoughts at the beginning. I was planing to add module for battery monitor , other amplifier for battery ..
And i finally use those 3 modules.Down right is TP4056 module ,as you remember from another project is a constant current lithium charger battery. Current is adjusted just changing a resistor. Input is 5 volt from compute through mini usb output is connected a 18650 battery
Second, on up right , it also a step up converter from 1-5 to 5 volts.Input is battery and output is 5 volt.
And last but not least is the amplifier 3W+3W. It is a stereo ready amplifier/Power supply for this is also 5 volts.
so simple,there is nothing special
I forgot to mention about speaker, those are 2 portable speaker from Sony Ericsson for mobile phone.There was an already pre installed amplifier on series with cable , but it was now power at all and it was replaced. Code is mps-60