Components►
1. TDA7388 ic.
2. 1×4700uF 25V capacitor.
3. 5×104pF capacitor.
4. 1×1uF capacitor.
5. 1×47uF capacitor.
6. 1×0.47uF capacitor.
7. 1×10k resistor.
8. 4×47K single turn potentiometer.
9. 1×L7805V ic.
Schematic
In this post I make a 4 channel audio amplifier. Which can deliver upto 40 watt R.M.S power per channel at 4Ω. The TDA7388 is an AB class audio power amplifier. For power supply you can use 0-12V 10A transformer. Now follow my steps for this amplifier. First we make pcb. For make pcb you need pcb layout. download the pcb layout and print it by laser printer on photo paper. Then cut the pcb layout. Then press the pcb layout by iron on copper clad board. Press the iron 10-15 munites. Then leave the pcb for cool down 10 munites. when the pcb was cool, put the pcb in water and move the pcb layout to copper clad board. Then put the pcb in ferric chloride [FeCl3+H2O] for etching 10-15 munites. when etching was end, clean the pcb by water. Then make hole on pcb. And then press the upper side print of pcb. Now your pcb is ready mount components by instruction.