I am about to attempt make my first audio amplifier (beyond an LM386 amp). I chose the TDA2030A (dataheet http://www.st.com/web/en/resource/technical/document/datasheet/CD00000128.pdf). Since its a dangerous thing to do I chose an smps power supply, which is 24V and 2A. I have been training for this task for the last month and a half, learning to make PCBs etc. Yet realizing the nature of electronics, where there is always some piece of knowledge that is hiding in the bushes and that I wasn't aware of, I decided to ask the community some questions that will help me make this amplifier without killing myself in the process. Just for background, Electronics has been a hobby for the last 3 months and I am an Industrial Engineer myself.
If you look at the circuit diagram, the amps use pin 1 as their non inverting input. In this diagram taken from the datasheet, the amp on the right has its non inverting connected to a resistor that is connected to ground. Both amps drive a single speaker. My question is that if I connect the right amp to the right audio channel and the left of the left audio channel, unlike shown in the diagram, can I drive two speaker? I don't see why it cant be done.
For proper grounding, I create ground planes on my pcb. Then I need to make a hole in my PCB on the ground plane and connect it via wire to the Ground on the smps. Right? (am asking stupidly obvious questions just to know if I am right). Proper grounding seems the key to any proper functioning electronic circuit.
Do I need to have a complex filtering system like capacitor for ripple etc? I ask this because this is smps purchased from the market, it would already have the required components.
What is the V ADJ pin on my SMPS? How do I use it?
Thank you. Any help will go a long way in insuring a long life for me.