Hi, today I will share with you my little amplifier, is not very powerful but I love it.
1x Power bank
In the schematic we can see the 37Ohm resistor that has a power of 2W, the other are 1/8W and are enough critical, you should see a voltage of 2,5V across the big resistor if all works correctly.
This is a class A amplifier and use a power n-mos as a switch, but is not very efficient, so the power mos need a heat sink because is get warm quickly as the big resistor.
A 0,1k resistor in parallel to the speaker will give a less inductor and a more resistive load.
I haven't used a clean audio source file, but I hope you like it, bye.