This small amplifier isconstructed around the TDA2003 IC capable of delivering 4W rms. The IC is completely thermally & short-circuit protected. A conventional DC supply can be connected as supply. Overload & short-circuit protected. Specifications Music power output 7W4 Omega RMS output 3.5 W4 Omega & 2W8 Omega THD 0.05 1W1k Hz Frequency response 20 Hz to 20k Hz 3d BSN ratio 86d B A weighted Input sensitivity 40m V150k Omega Supply voltage 15 Vdc 8 to 18 Vdc possible at 0.5 A Dimensions 55 x 35mm