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Old 17th April 2007, 06:43 PM   #351
cviller is offline cviller  Denmark
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Thanks for sharing this!! It looks great... but I was so happy with my F4 clone.

Will the R0 go in production soon?
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Old 17th April 2007, 06:47 PM   #352
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It is production now.

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Old 17th April 2007, 07:18 PM   #353
Darry is offline Darry  France
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Thanks M. Pass, the one and only.

Darry
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Old 17th April 2007, 07:22 PM   #354
veteran is offline veteran  Poland
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Great work (like always) Mr Pass

Modifications added - I almost redesigned PCB. I will probably place sources in PDF format for a minute.

schematic f4_r0
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File Type: gif f4_r0.gif (33.2 KB, 1937 views)
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Old 17th April 2007, 08:06 PM   #355
veteran is offline veteran  Poland
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Documentation to DIY this PCB

bottom layer
top layer
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Old 17th April 2007, 09:35 PM   #356
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Not so fast - I knew there was a reason I was going to wait
a day - reload the schematic and check the connections on
D3 and D4.

www.passlabs.com/np/F4R0.pdf

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Old 17th April 2007, 09:49 PM   #357
jleaman is offline jleaman  Belgium
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Quote:
Originally posted by veteran
Documentation to DIY this PCB

bottom layer
top layer

I hope i have your permission to print this board to test it out, ?
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Old 17th April 2007, 09:54 PM   #358
veteran is offline veteran  Poland
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I placed corrections on schematic and PCB - now it should be OK I have to look at this design one more time in day light (it's midnight round here) and try to short tracks as much as it's possible.


Jleaman, you don't need a permission - do what you have to do
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Old 17th April 2007, 10:10 PM   #359
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Quote:
Originally posted by jleaman
I hope i have your permission to print this board to test it out, ?
Our standard IP statement: We don't interfere with non-
commercial use of published information.

(wouldn't be very effective at it anyway)

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Old 18th April 2007, 12:19 AM   #360
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This version bootstraps the front end so that the JFETs only see about 1/2 the voltage swing.
WoW! So are you saying we can get into say +-40v or so, assuming adequate cooling? Where would that put us - 50wpch or so of class A?

Thanks Mr Pass

OH, and before I forget - could you please make any more refinements before I complete mine because if you do it afterwards I may . Not a pretty sight.
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