A little Amplifier for MP3 players and your Experiments with Arduino

Optimized Fritzing Amplifier now called mjIno it is an Amplifier for Breadboard connect or your MP3-Players like cellphones.

I always wonder when people contact an 8 ohm loudspeaker direct to the microcontroller pin. When we calculate the current through the speaker we get : I=U/R= 5V/8 ohm=0,625A=625 mA But microcontroller pin can only drive 20 mA to 40 mA!!!

So I designed this little amplifier to solve this problem.

Now you can connect your experiment by the mjIno and enjoying the sound.

Have a lot of fun!

Thanks to Fritzing Fab for producing the PCB! They become grate! Just the backside print I was missing. Hopefully I'll get one next time.

Yours Michael J.