X100 backengineered here

[Jason]

Anyone is welcome to host their projects on diyaudio.com. Just send me the files or the site you want uploaded and I'll make a space for it.

[Petter]

It is hard to tell, but judging from the information I have up to this point as well as comments from Nelson Pass in this very thread, I suspect it is almost completely the same.

Read what NP said and judge for yourself -- last post on page 3.

Photos will be forthcoming when I can get hold of a digital camera.

Petter

[Edited by Petter on 07-26-2001 at 05:20 PM]

[Gordon Gekko]

Except for the small fact that Nelson uses 80 output devices instead of 16......The X-1000 dissipates about 600W per channel, so if you would have used only 16 output devices they would have a real tough job. Spreading the load, as Pass does, is the only way for these kind of high-powered and hot-running amps to last....(please bare this in mind)

Gordon Gekko

[Jakeh]

The clue to that is the name of the thread. Petter's got it covered. I guess he doesn't have a listening room the size of an aircraft hanger.

Jake

[Petter]

Functionally almost completely the same would be my best estimate.

Petter

[Nelson Pass]

We routinely post project pics at our site,
and you are welcome to send them to
dharrington@passlabs.com

[Petter]

This is work in progress. I will send pictures to you when project is finished and working -- then you can decide if you want them.

Petter

[grataku]

Mr. Pass
after you take the test, the teacher usually posts the keys...

[Jason]

I have uploaded Petter's pictures to this url (thank you Petter!)

http://www.diyaudio.com/projects/petter

[Edited by Jason on 07-30-2001 at 12:57 AM]

[Petter]

Triplets: An Excel optimization model for creating compound resistors where current in trimmer is minimal, all turns of trimmer are used in desired window, and progressions is relatively linear.

Other files: Images of circuit. Don't laugh at the amateurish look + crammed board ...

Please note:
1. Brass screws (no ferric materials here!)
2. Small dimensions of board
3. Lack og ground
4. Power supply comb pattern is "filler" to fill the board. I figured if I did this I would be able to find use for it.
5. Rounded features in PCB track corners.

Also note what I did wrong:

1. PCB tracks could be thicker
2. Size could be made a little bigger
3. Mounting holes should be set up (not really a problem, but ...)
4. I ended up using larger resistors than expected (which is good because they don't modulate so easily but the pattern was a little tight for them.
5. Trimmers are too close to other things.
6. Pads could be a little bigger.
7. Transistors have a thicker side. If you put two of them together, that is about 8 mm of space which I did not plan for! Check out the central right transistor (top) and you will see what I mean!
8. Small silly things that amateurs do.

But hey, this is my first print. There are also other modifications that could be done.

Petter