does this power buss look right

[nus]

sorry, my understanding of electronics is a bit shady. but I want to make this power buss for a  +12 -12 +5 linear power supply

[Gyro]

Yes, it looks correct in terms of polarities, but it is a bad idea to use transistor symbols for voltage regulators. Check the datasheets carefully - 78xx and 79xx have different pinouts!

[jbb]

Thanks for providing pictures.

The diode rectifier is a little concerning.  It looks like you've got two half-wave rectifiers.  If the currents on the +12 and -12 rail are fairly equal, that should be OK.  If the currents are unequal, you will end up with a DC current in the transformer winding, which can be very bad news.

DC current in a transformer secondary causes DC flux in the transformer core.  A little bit is OK, but if you have too much, the core can enter saturation.  During saturation the primary inductance drops away, then the primary current can spike really high and cause damage.  So I would say that you definitely need a fuse in series with the primary.

A good way around this is to use a centre tapped transformer:

[nus]

So was more asking about just the buss board and the polarity of the caps. not sure what sort of chaps i should use, was just going to go overkill and do 1000uf. cheers for the heads up on the voltage regulators, just about to start making that board.  also, chees for the heads up on the transformer i'll have a look around for some

[nus]

do you think i will get much loss at the end plug, this board is like 310mm long. main traces are like 100 thou