[sdiy] Power distribution board

[David G. Dixon]

As most (all?) CMOS chips can be powered from +15V, then this eliminates the
need for a 5V supply.  However, it also makes a good argument for the
separate ground line on the 4-pin MTA connector, does it not?

> If you want to reduce power consumption, use CMOS chips.  The plain 74xx
> chips consume a lot of power.  74LS or 74ALS are better, but I believe the
> the HC/HCT/AC/ACT series (and also 40xx series) are most efficient.