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-   -   My Take on X-BOSOZ (http://www.diyaudio.com/forums/pass-labs/67448-my-take-x-bosoz.html)

Russ White 7th November 2005 01:44 PM

My Take on X-BOSOZ
 
2 Attachment(s)
It seems there are a lot of people, besides me of course, who have been wanting a good quality PCB for XBOSOZ. Well I have been pointed to several thread and tried to glean as much as I could. This is a completely no area for me, and my first pass at a Pass design. :)

First of all thank to all those who have paved the way. They did the real work here, this is very small thing compared to what those people have done.

So thanks to these people in Particular:

Nelson Pass, of course.
Metalman, Terry Aben whose circuit I followed.

But I am sure there are others who deserve credit, and to those I apologize for not knowing who you are.

Anyway they say a picture is worth a thousand words, so here are 2000 words worth.

First the Schematic:

Russ White 7th November 2005 01:46 PM

And the layout
 
2 Attachment(s)
Here is the layout:

Russ White 7th November 2005 01:52 PM

The PCB is pretty compact at 4.2" x 2.7" and is designed for a common HS.

It allows for either a radial output cap or axials up to 2.1" long or so.

Cheers!
Russ

steenoe 7th November 2005 02:12 PM

Excellent job, Russ. Looking forward to order a couple if at all possible;)

Steen:cool:

lgreen 7th November 2005 03:14 PM

nice!
 
Nice work, I like how you have all the Q's on one plane.

While you left room for very long C5 and C4, I think you did not account for how fat these tend to be and might want to re-look at this.

What's with all the CPA's and CPB's? Are these where the vol control attaches?

Russ White 7th November 2005 03:18 PM

Re: nice!
 
Quote:

Originally posted by lgreen
What's with all the CPA's and CPB's? Are these where the vol control attaches?
Hi,

Thank you very much.

CPA/B and CPA1-4/CPB1-4 are for the AXIAL C4/C5 caps, which if you used axials you would omit the radial C4/C5

I printed the layout on papaer and check a 33uf cap which is about 1-1/4" diameter. It fits fine, but it will extend off the sides just a bit. But no need for PCB over on the sides that does nothing. :)

Cheers!
Russ

lgreen 7th November 2005 03:27 PM

Re: Re: nice!
 
Quote:

Originally posted by Russ White


Hi,

Thank you very much.

CPA/B and CPA1-4/CPB1-4 are for the AXIAL C4/C5 caps, which if you used axials you would omit the radial C4/C5

I printed the layout on papaer and check a 33uf cap which is about 1-1/4" diameter. It fits fine, but it will extend off the sides just a bit. But no need for PCB over on the sides that does nothing. :)

Cheers!
Russ


OK......Now I see how stupid I am! Sorry about that!

Since I am making suggestions, how about you modify the schematic and put in the vol control? The only reason is that you would then be the only one to have a full X-CCS-BOSOZ schematic with vol control, apparently since its so "obvious" no one includes it in their schematics.

Plus if you are making boards people will wonder where to hook up the vol so even if you just have some holes with a label it would be a little easier for beginners. Also its kind of odd to have a preamp circ lacking volume.....but of course its up to you.

adolphe 7th November 2005 04:18 PM

If you end up having some pcb's made, I'd definately be interested if cost was reasonable.

Nice job.

phoneisbusy 7th November 2005 05:08 PM

While we're on the subject of requests, would Russ consider a version of his source selector for the x-bosoz? A volume/balance controller circuit would be appreciated also. I was wondering if Russ could not reuse some of his work with his preamp (i.e. the volume control section).

regards

Dave

steenoe 7th November 2005 06:10 PM

Quote:

While we're on the subject of requests, would Russ consider a version of his source selector for the x-bosoz? A volume/balance controller circuit would be appreciated also. I was wondering if Russ could not reuse some of his work with his preamp (i.e. the volume control section).
If done in a modular fashion so one can pick and choose, that might be a great idea.
IMO, it would be a bad idea to design any of that into the board itself. Are we talking remote control here also?;)

Steen.:)


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