My Sega Genesis Internal Power Mod + AV mod

It would be safer, if you don't know what you're doing, which I get the impression the OP doesn't really.

The reason to use RCAs, is because the Mega Drive/Genesis 1 doesn't have stereo sound on the standard output connector, and because its a lot easier to find an RCA cable lying around to plug your Mega Drive in when you want to play a game

That, and I plan to add S-Video and a 9 pin rgb socket, so its standardised.

I also don't have enough power supplies for all my Mega Drives and Genesis'... some have come from America, so the PSUs weren't suitable for Australia anyway, and another was bought with no PSU..
Yes, I could find a suitable external power supply... but old 5volt, 1amp phone chargers are generally free!