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Old 5th April 2010, 08:46 PM   #151
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DC Servo is not necessary. DC Servo improved temperature dependence.
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Old 5th April 2010, 08:52 PM   #152
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I emitter resistors of several larger, take up less space and have a smaller inductance.

Each HEXFET Power MOSFET has a capacitor 1mF/100V (2.2 mF/63V) and 100n/100V

Last edited by Federmann; 5th April 2010 at 08:55 PM.
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Old 5th April 2010, 09:03 PM   #153
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Short-circuit current limitation ensures zener diodes, 5 6V under UGS transistors

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Old 5th April 2010, 10:12 PM   #154
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That'll never work... You didn't even round the corners.
Just look! 90deg angles everywhere. Then linking it all to
a time release GIF capsule only makes the matter worse.
Think of the phase shift???
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Old 5th April 2010, 11:17 PM   #155
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See? Round corners = much better-er-est!

And something to be said for a Black'N'White drawing too. How your
schematic gonna work with all those funky colors what take 5min just
to draw the whole GIF (Federmann post#149)?

Seriously though, why you guys drive so many parallel output devices?
The Apex pushes enough Watts, I'd agree at least two, but four???
This seems a very conservative design decision. I thought even these
old MOSFET types offered far better SOA?

I guess you can always DNI a needless MOSFET later.
Pretty hard to add holes and traces after the fact...

Am I killing myself here, with only one MOSFET per 55V rail?
Mine are in big TO3 cans. My P-CH has a funny JAN number,
2N6804 but is the same like 9240. Current limiters kick at 7A.
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Last edited by kenpeter; 5th April 2010 at 11:28 PM.
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Old 6th April 2010, 05:23 AM   #156
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Quote:
Originally Posted by kenpeter View Post

Seriously though, why you guys drive so many parallel output devices?
The Apex pushes enough Watts, I'd agree at least two, but four???
May be 1 to 8 pairs, power 125W ... 1000W. For 4 pairs of 500W.
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Old 6th April 2010, 06:11 AM   #157
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My English is not very good. I wrote more here.
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Old 6th April 2010, 06:48 AM   #158
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I don't see a problem with any of these topology,
except some need high voltage rail to drive gates.
I turned mine inside out, but don't quite reach the
full rails either, probably cause I didn't parallel...

I'm a little dissapointed your drawing reveals no
component details to make a fair comparison vs
Apex? If you are going to claim better than him,
or me, show your stuff!

I'll even cut you some slack if you forget to round
some of the corners... Your English is fine, I'm the
idiot here. Won't write my own language properly.

Last edited by kenpeter; 6th April 2010 at 07:09 AM.
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Old 6th April 2010, 01:38 PM   #159
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Quote:
Originally Posted by kenpeter View Post
See? Round corners = much better-er-est!

And something to be said for a Black'N'White drawing too. How your
schematic gonna work with all those funky colors what take 5min just
to draw the whole GIF (Federmann post#149)?

Seriously though, why you guys drive so many parallel output devices?
The Apex pushes enough Watts, I'd agree at least two, but four???
This seems a very conservative design decision. I thought even these
old MOSFET types offered far better SOA?

I guess you can always DNI a needless MOSFET later.
Pretty hard to add holes and traces after the fact...

Am I killing myself here, with only one MOSFET per 55V rail?
Mine are in big TO3 cans. My P-CH has a funny JAN number,
2N6804 but is the same like 9240. Current limiters kick at 7A.
I like your design, I have amplifier with one BJT per 55V rail.
100W Ultimate Fidelity Amplifier
Regards
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Old 6th April 2010, 08:06 PM   #160
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Quote:
Originally Posted by apexaudio View Post
Thanks, 100nF of Zobel network must be conected on P GND, no IN GND. P GND and IN GND can not be conected together, see post #145 and original PCB.
Regards Mile
Thanks for the corrections.
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