The powersupply shall:
* Output DC
* Be regulated or stabilised.
* Supply between 4.75V - 5.25V
* Be able to provide more than >100 mA
* The wire between the power supply and the minimig board should be less than 2 meters (less is better)
* The positive (+) shall be in the center of the DC plug and (-) at the exterior (at least that's how the schematic looks too me)
The +5V only supports the external ports: Joystick1, Joystick0, Mouse, Keyboard.
Many circuits allow for upto 5% or even 10% up or down. And even if your power adaptor gives more than 5V, you most likely fry your keyboard, mouse etc.. not a big deal.
ALL circuits on the board itself (fpga, m68k, ram, etc..) is powered by
LM1117MP-ADJ linear regulator.
The onboard power regulator LM1117 can take up to 11.39 Volt continously with a SOT-223 package at 40° Celsius room temperature (at 100mA).
If you can touch the power regulators without burning your fingers, it's fine. As fingers start hurting at ~60° Celsius and the silicon won't melt until ~150° Celsius.
If anyone is really worried, buy a 7805 regulator and wire it to a battery with more than >5V and solder this to the DC plug. That way no transients, thunder or other powergrid suprises will enter your minimig. It only leaves your TV screen.. :-)
(if anyone finds any contradiction in schematic or datasheets, pls tell)
