Some results, as promised (sorry about messy/bad quality pictures):
The PSU Voltage before the circuit (a little low, but that is due to the load on it).
And the voltage after the circuit:
Not to shabby, and still within the ATX standards (11.4). For the record, this is the results from two PSUs hooked together, powering a 400 Watt car stereo (I had it laying around...). I was soon blasting music out at obscene volumes, and rumbling the floor
Still interested? I'm sure that if I took readings without the load, they would look a lot higher.
Do you think that this would make a good Pro/Geek article, would any of you read it?