Circuit Lake

Electronic Project and Circuit Collection

7 Watt Audio Power Amplifier, TDA 2003

10/09/2012 Category: Analog, Audio

This small amplifier is built based on TDA2003 IC. It can deliver 4Wrms at 4ohms. The TDA 2003 has improved performance with the same pin configuration as the TDA 2002. TDA 2003 keep maintained additional features of TDA 2002 such as very low number of external components, ease of assembly, space and cost saving.

multipurpose audio amplifier

This multipurpose audio amplifier provides a high output current capability (up to 3.5A) very low harmonic and cross-over distortion. Completely safe operation is guaranteed due to protection against DC and AC short circuit between all pins and ground, thermal over-range, load dump voltage surge up to 40V and fortuitous open ground. A conventional direct current can be connected as supply.

Circuit diagram:

7 Watt Audio Power Amplifier Schematic

Parts List:
IC1 = TDA2003
R1 = 470R
R2 = 47R
R3 = 100R
R4 = 1R
C1 = 1822pF
C2 = 100nF-63V
C3 = 100nF-63v
C4 = 10uF-25V
C5 = 470uF-25V
C6 = 1000uF-35v
C7 = 1000uF-35V


  • Music power output: 7W / 4ohm
  • RMS output: 3.5W / 4ohm or 2W / 8ohm
  • Total harmonic distortion: 0.05% (1W / 1kHz)
  • Frequency response: 20Hz to 20kHz (-3dB)
  • Signal/noise ratio: 86dB (A weighted)
  • Input sensitivity: 40mV / 150Kohm
  • Overload and short-circuit protected
  • Supply voltage: 15V DC (8 to 18V DC possible) / 0.5A
  • Dimensions: 2.2 x 1.4″