I'm building an AMP7 for someone in the UK right now and shot some pics which I thought would be nice to post. It's got two 2x33V 500VA toroidal transformers (one for the positive and one for the negative rail), an NTC softstart with 48Vac bypass relay that closes over them when there's AC voltage coming from the transformer secondaries. I built a dual rectifier from MUR820 (to220 case) diodes (just like in PSU1-PS) and put some R/C network over the diodes to filter switching peaks from the diodes (just like in PSU1-PS) There are eight 10000uF 63Vdc RIFA caps in there in total.
EDIT: original text:"I put a rectifier on the 5V regulator input so I just need Vac to feed it with directly from a transformer and the same is done with the VN10. This is just to try and see if this works out to be "silent" enough which I guess (hope) it will."
EDIT: Don't do this!! It gives a slight hum residue! You may try this with a larger bulk cap, but I would still not recommend it. You'd best apply some stable DC voltage here, but it doesn't have to be precisely 10V because there's a regulator circuit on the board. I used a half PSU1-VR board set to 12Vdc in the final rev. (see pics below)
It's got a nice case with 10mm thick black front panel from modushop.biz and I salvaged a heatsink from an old sony monitor to place the amp on. This is a prototype AMP7 board, so not black but green.
I chose the lower supply voltage to keep the power just moderate as there is no need for 500W/ch violence... Plus this keeps the voltage safe for the 48V relay, although it wouldn't be hard to just use a dc relay that operates from a 60V rail of course...
The whole setup is not meant to be ultra audiophile, but just a plain and simple good and stable amp. (which I also hope will work out the way I planned...[8)])
Wish me luck![8D]
I would be most pleased to see your AMP7 build pics
------X-max. can be several meters on any driver, too bad it can be done only once...------