USB Powered Audio Power Amplifier is a multimedia speakers external used for PC's or Laptop, has using single chip Amplifier that based on LM386 as a part for amplifying signal audio from PC or Laptop. The IC LM386 is a power amplifier designed for low voltage class AB amplifier,wide range voltage input, supply voltage minimum 3V and maximum 12VDC. So it can be used on a USB Voltage 5VDC from output PC or Laptop.
For DIY USB Power Amplifier by using this LM386 you a Parts that you need below an example:
Parts and Tools:
-Components and PCB Power Amplifier LM386 + Tone Control (Circuit and Layout include below)
-USB Male Cable Connector
-3.5mm Audio Jack Male and stereo cable for audio
-Speaker + Cable
-Some Solder Tin
The LM386 Mono Power Amplifier include Tone Control Circuit Diagram:
Circuit above is Mono Circuit Power Amplifier and Tone Control, if you need a stereo amplifier you just multiple the circuit. Voltage supply input from USB added rectifier diode 1N4007 for rectify and additional fuse if the power amplifier short, so saving the PC or Laptop USB from damaged. For output power amplifier its very low power that about 1W.
For this USB Powered Audio Amplifier Project, I'm using 2X10W Speakers at 4Ohm it can be drived by this LM386 Power Amplifier. The Tone Control Circuit is simple design so very poor performance for gaining bass and treble tones.
The LM386 Chip Amplifier:
Complete PCB Layout Design Power Amplifier + Tone Control:
Layout PCB Top view:
PCB and Physical Components view:
Video USB Powered Audio Amplifier LM386 include tone control: