Can anone tell me what the markings on a PAL007A mosfet mean. I have a 0.4 marking in the right lower corner of the mosfet. My replacement mosfet had a 0.8. What does this number represent? Can anyone help me out?
Your going to draw a fair amount of current with 2 speakers driven at full power: 2*50/8
Divide by 12 and you get the amount of current your supply will have to deliver.
Check for any DC output on the speaker terminals without a load.