The 5 Watt audio amplifier shown here are suitable for driving the speaker size 8 to 12 inch. Here used an audio output from Sanyo LA4460 IC. The IC is actually used for car radio or car audio power amplifier and may deliver output power up to 12 W. But in this circuit is only used 5W.
The 5 W audio amplifier circuit consists of loudness control, driver amplifier Q1, and the bass and treble controls of approximately ± 10 dB boost / cut. Either the ac supply shown in here can be used, or a 12 Vdc supply can be connected to points A&B (positive) and C (negative). Two of these circuits, using ganged potentiometers at R2, R7, and R11 can be used for stereo applications. T1 is a 12Volt 1 ampere plug-in transformer. Notice that IC1 must be heatsinked. Power output is about 5 W. A 4″ x 2″ x 0.050″ aluminum heatsink should be adequate.
5 Watt audio amplifier Parts list : R1, R6 : 10K R2, R7, R11 : 100K R3 : 2.2M R4, R10 : 4.7K R5, R14 : 470 ohm R8, R12, R13 : 1K R9 : 0.022 ohm R15, R16 : : 2.2 ohm C1 : 1uF C2 : 0.047uF C3, C7, C8, C19 : 0.1uF C4 : 100pF C5, C14, C15 : 100uF/10V C6 : 1uF/16V C9 : 0.022uF C10 : 0.22uF C11 : 100uF/16V C12 : 0.001uF C13 : 1uF/16V C16 : 0.01uF C17, C18 : 1uF C20, C21 :0.001uF C22 : 2200uF/25V C23 : 2200uF/16V D1 : 1N4735 D2, D3 : 1N5480 D4 : 1N5400 Q1 : 2N5000 IC1 : LA4460 Sanyo T1 : 12 V / 1 A
