Taking away the AV would make it cheaper but only about 5$, so it wouldn't be worth it, I mean better to have that option available.
The scart has audio too, but modern flat TVs today have pretty bad sound so alot of people take it threw their surround system, and then it's
pretty much easier when the AV is there...
It's using the 3x Transistor for amping, there is a lot of different amps out there but most is made by people who don't have any knowledge in video circuitry, and they put capacitors and resistors hi and low "to make jailbars go away" claiming their circuit is the best and that you couldn't live with out it, a little voodoo I would say, so the 3x transistors works mostly fine....
Ok here's the real banger, expect about 75-80$, just the parts goes for about 45$, and then about 15$ for the tracked shipping, so thats about 60$ add to that it takes up to 10 hours just to make it, so theres no real profit.
Pics will come later.