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20W Class-D Audio Amplifier Kit - UAM2

by Ramsey Electronics

20W Class-D audio amplifier kit

The UAM2 kit uses the latest amplifier technology to bring you a clear, crisp, high-power audio without any of the heat which is normally generated with traditional amplifier circuits. It uses a small surface mount (SMD) class-D amplifier IC, which can deliver a full 20 watts of power output (when using 18V power supply) without getting hot.

You can install this amplifier right inside your speaker enclosures, or wherever this small kit will fit. There are four gain settings giving you a rough volume adjust, and also a shutdown input so you can turn the amplifier off without disconnecting the power.

Remember that this is a Surface Mount (SMT) kit, so you will need fine tweezers, a magnifier and a decent fine tip soldering iron for assembly. The 24 pin TPA3001D1 amplifier is soldered onto the board, but all the other parts are left for you to solder. If you have some surface mount experience, it should be really easy.

Parts list:

  • R1, R5: 51 ohm SMD resistors
  • R2-R4, R6: 120K ohm SMD resistors
  • C1: 1500uF SMD electrolytic capacitor
  • C2, C3, C5-C7, C9, C11: 1uF surface mount capacitors
  • C8: .47uF surface mount capacitor
  • C10: 220pF surface mount capacitor
  • C12, C13: .22uF SMD capacitors
  • C14, C15: .001uF SMD capacitors
  • D3, D4: 20BQ030 Schottky diodes
  • U1: TPA3001D1 audio power amp IC
  • L1, L2: surface mount ferrite beads
  • J1, J2: 2 pin headers
  • J3: RCA jack
  • J4: 2.1mm power jack
  • J5, J6: screw posts
  • J7: 3 terminal green screw header
  • foam tape, 4 inches
  • red/black twisted wire, 2 ft.
Class-D power audio amplifier schematics:
10W Class-D amp schematic with TDA7480
170W Class-D amp schematic with LM4652IC

More power audio amplifier schematics with:
TDA2040, TDA1013B, TDA2005, LM386 and TDA2003.