7 Watt Audio Power Amplifier

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Small but powerful multipurpose 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:

Front View of 7 Watt Audio Power Amplifier

Front View of 7 Watt Audio Power Amplifier

Circuit diagram:

7 Watt Audio Power Amplifier Circuit

7 Watt Audio Power Amplifier 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


  • 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 × 1.4