This small amplifier is constructed around the TDA2003 Integrated Circuit (IC) capable of delivering 4 W rms at 4 ohms. The IC is completely thermally and shortcircuit protected. A conventional analog direct current (DC) power supply can be connected. Manual shows ans example power supply.

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