AUX Power

The auxiliary / LED power is discussed here:

AUX Power - How and Why

Transformer instead of Wall Adapter

This power supply is designed not only for excellent performance, but also for safety.

Using a transformer means having to handle mains power. Doing so incorrectly can kill you, plain and simple.

Other than the possibility of hurting yourself or starting a fire, a single output AC adapter will work in the same way as a wall adapter. If you have sufficient knowledge to do so, go ahead.

The only piece of advice I will give is to use a suitable fuse with your transformer.

Really, the wall adapter contains a transformer. And you will greatly reduce interference by placing the transformer outside of your cabinet.

A Short Note on Component Choices:

The choice of components is also done with safety in mind. If you know what you're doing, you can use 1N4001 diodes and 35 (or even 25, but that's really pushing it) volts electrolytic capacitors.

Use the recommended values for best operation and maximum safety. The difference in cost is almost negligible, and the peace of mind is priceless.