How to build 7 Watt Audio Power Amplifier Circuit Schematic

August 5, 2010 - category: Audio amplifier


This small amplifier is constructed around the TDA2003 IC, capable of delivering 4Wrms at 4ohms. The TDA 2003 has improved performance with the same pin configuration as the TDA 2002. The additional features of TDA 2002, very low number of external components, ease of assembly, space and cost saving, are maintained. The device 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's picture:


Circuit diagram:

Circuit diagram


  • 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
  • IC1 = TDA2003


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

circuit from http://www.extremecircuits.net/2009/09/7-watt-audio-power-amplifier-circuit.html

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