Power supply bigger

[nosamiam]

I'm going to be building a couple of power supplies based on the Scott Swartz' design (Four Output Isolated Power Supply on www.generalguitargadgets).

Here's the parts/board layout



My question is this: if I want to increase the number of outputs to maybe eight, what do I have to do?  I know I need more transformers, caps, rectifiers, and regulators.  Do I need to increase ratings on anything?  Or do I just leave everything as-is, simply tacking the additional components on alongside the ones already there, effectively doubling the circuit.  Any help?

[nosamiam]

Bump...

No help?  Do I need an uprated fuse?

[R.G.]

You just tack on more stuff in parallel. You could use a bigger fuse, or fuse every two transformers separately.

Have you read "The Spyder" at GEO?

[nosamiam]

Have you read "The Spyder" at GEO?

Maybe 20 times or so...

Thanks a lot, R.G.  I'm starting to feel pretty confident now.  This is my first AC project.  I did work with a transformer when building a re-amp box, but high voltage is definitely a scary beast.

[R.G.]

This is my first AC project.  I did work with a transformer when building a re-amp box, but high voltage is definitely a scary beast.

The beast is definitely scary. Consider making sure that the distance between any AC power conductor on your PCB and any secondary wires be at least 8mm. That includes the distance to the edges of the PCB and to the mounting studs, as well as from the AC line fuse to the secondary. It's close now, but I can't tell exactly with no scale.

Also, I would try to figure out a way for the fuse to be right next to the place where the AC cord comes onto the board if I could. You've properly fused the black/line conductor, but there's a long length of un-fused AC line conductor under the board. A solder ball could still short this to the chassis before the fuse.