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Old 1st July 2013, 06:54 PM   #801
PMI is offline PMI  United States
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Quote:
Originally Posted by ivanlukic View Post
It probably is less of an issue with capacitance multiplier PSU. (I hope I don't have to replace 1N4007 on my board, but I have a quantity of ultra-fast UF4007 if they are needed)
Don't think this should be an audible problem even w/o the new power supply. Not if you are using the same on-board caps I am.

If I remember correctly, by the time I switched to a conventional 3x4700uF configuration with CRC or CLCRC, that diode was always on at power levels that correspond to normal listening volume.

@Shaan, correct me if I am wrong, I can check this again.
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Old 1st July 2013, 06:57 PM   #802
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Maybe we should call Jason's version PeeCeeBee "Turbo"
Hmm, maybe. I've just begun to layout a parallel TO3 board and am thinking about a passive bootstrap to allow for increased gate drive to improve voltage efficiency. Any thoughts? Would still be a PeeCeeBee, just pumped up a little. Couple this with some of the dual die Exicons...
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Old 1st July 2013, 07:25 PM   #803
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Originally Posted by jkuetemann View Post
Hmm, maybe. I've just begun to layout a parallel TO3 board and am thinking about a passive bootstrap to allow for increased gate drive to improve voltage efficiency. Any thoughts? Would still be a PeeCeeBee, just pumped up a little. Couple this with some of the dual die Exicons...
I think it is certainly worth a shot, and I like the idea of trying these. The dual die Exicons are a cool part on paper, but I have never had any in my hands. We may be starting to deviate from the original concept with these though... I think they are a fairly pricey part, and not universally available.
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Old 1st July 2013, 07:39 PM   #804
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Don't get me wrong here, I'm not suggesting that the dual die Exicons would be the preferred device, just that it could be a pretty capable little beast with them. To the contrary, I'm still very much on board with the original concept.

There was some very early interest in paralleled devices and it seems perhaps a logical step to take. Also, the idea of using a bootstrap arrangement can make the amp a little more voltage efficient.

I'll post my current idea shortly.
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Old 1st July 2013, 07:57 PM   #805
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Default Turbo PeeCeeBee?

Looking at going down a road a little like this... Any thoughts?
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File Type: png Turbo PeeCeeBee.png (37.7 KB, 432 views)
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Old 1st July 2013, 08:53 PM   #806
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Originally Posted by jkuetemann View Post
Looking at going down a road a little like this... Any thoughts?
I don't think I know enough to give you some useful comments on the circuit. I like the concept though.

In general, two devices per rail, with at least some options, is likely to be more accessible to most people, than a dual-die Exicon.

Having said that, the dual die devices are very attractive, a single layer board layout and heatsink mounting is easier, and there is the potential for making one board so it can acomodate a single mosfet, or dual.
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Old 4th July 2013, 11:55 AM   #807
shaan is offline shaan  India
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Default Double-Output PeeCeeBee Draft

This is my plan...

Dimension: 4.3" x 2"

Please comment.

Thanks.

shaan



edit: Underboard FET mount.
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File Type: png pcb_hp_det_draft.PNG (32.5 KB, 334 views)
File Type: png pcb_hp_lay_draft.PNG (22.8 KB, 327 views)
File Type: png pcb_hp_full_draft.PNG (39.2 KB, 328 views)

Last edited by shaan; 4th July 2013 at 12:24 PM. Reason: UFM
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Old 4th July 2013, 12:35 PM   #808
naf is offline naf  Indonesia
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wow! finally a double output peeceebee has come
Shaan, please post schematic
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Old 4th July 2013, 12:55 PM   #809
shaan is offline shaan  India
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Hi naf.

It's the same thing. Only two FETs and stoppers extra, and polyester input cap(which may be omitted and replaced with a jumper for direct coupling).
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Old 4th July 2013, 01:33 PM   #810
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Hi Shaan,
wow that so simple if only add 1 more pair output but
no power resistor?
what is the max rail voltage than without source resistor?
I guess:
it is not final yet also gate resistor will be changed
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Last edited by JOHN BALI; 4th July 2013 at 01:34 PM. Reason: gate stoper resistor
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