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 Circuit diagram: 7 Watt Audio Power Amplifier Circuit Diagram Parts: 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 Specifications: 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"