I use a 7805 on my E10 socket board. You can solder it to the socket board near the power jack, without having to cut up or otherwise modify the board. If you're interested in a photo, let me know.

But you really need to put a heatsink on the 7805. You can get away without it if you feed it with good clean regulated 7.5 volt power, but anything higher will overheat a bare 7805. With a decent heatsink, you can feed it 12 volts without overheating it. (But avoid unregulated 12 supplies. I tried one, and it put out 19 volts unloaded, and 16 volts into the 7805 of my TINI!)

I got a nice power adapter from Radio Shack, #273-1667. This puts out 800 mA of REGULATED power at 3, 4.5, 6, 7.5, 9, or 12 volts. It's also well-made and not too expensive. Buy one of these, and you will never need to buy another generic DC power adapter again.

Here are some pictures showing the regulator, and some notes:

Note that the left (input) pin of the 7805 regulator (photo) is cut short and is soldered to the top of the board, where the power jack's center conductor terminal is soldered. The middle (ground) and right (output) pins of the regulator are soldered into the holes meant for capacitor C4. For a laugh, take a look at the date code on the regulator! The heat sink (photo) is from Radio Shack and is simply screwed to the regulator. Since it is supported only by the regulators, try to use a light one. A simple bit of sheet aluminum would probably work OK.

IMPORTANT: The regulator's output terminal is actually connected to signal V+, which is NOT the same as Vcc. (V+ is supposed to be unregulated 9-16 volts.) The Vcc and V+ signals need to be jumpered together. For some reason, the V+ signal is brought to the Auxilary 72-pin connector. So I added a simple wire jumper between the appropriate pins of the Auxiliary connector. This is visible in the third photo.

Doug Braun