WONDOM 1 X 25W 4 Ohm Class AB Audio Amplifier DIY Kit - TDA2050 Resistors: 22K (red red black red),680R (blue grey black), 4.7R (brown black gold); 4.7K (yellow purple red) Capacitors: 470uF 50V electrolytic, 22uF 35V electrolytic, 1uF monolithic PCB(Size: 61.20(L)  45.80(W)  1.6(H) 0.2mm) TDA2050 IC, LM317 Green LED(D1) ,Heat sink ,Fan, Nut,Screw