This 4W Audio Amplifier circuit is powered by 2 pieces of transistor TIP41. The circuit is very simple and incorporates darlington output transistors that will provide more than enough output current than is needed to drive a 3-ohm speaker.. The Simple Audio Amplifier Circuit using TIP41,,TIP42, BC182, BC212 transistors and TLE2141C IC is an excellent choice for audio enthusiasts.
I have build this amp.I have attached the schematic & completed photo of amp.You have to just replace transistor MJE3055 with TIP41 & MJE2955 with TIP42 in the schematic.. 12 voltage amplifier using transistor TIP41 and TIP42 This is a mini amplifier circuit diagram. this circuit run from 10 voltage to 18 voltage. normally we can use 12 voltages. we can use 12 voltage battery also. here used 2 transistors only. tip41 is an NPN transistor and Tip42 is a PNP transistor. it's one pair transistor that can make a maximum of 50 watts. it also depends on amplifier.