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Old 9th November 2007, 12:12 PM   #111
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Cleaned up a bit, we're slowly getting towards something useful:

Click the image to open in full size.

Bottom layer pdf: http://www.hb001.de/aj_pcb3.pdf
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Old 9th November 2007, 01:25 PM   #112
traw is offline traw  United States
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what about the film cap on in -?

Also, questions in general...
1 ) How come R27 now takes after the 1.5 + 3.32 versus in between R25 (1.5) & R26 (3.32) ?
2) I know AC gain could be measured, but is there a ballpark target that this setup gives? 1.2k - 1k
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Old 9th November 2007, 01:36 PM   #113
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Quote:
what about the film cap on in -?
As said earlier, I omitted the input coupling cap for giving everyone the opportunity to tie a bulky paper-in-oil cap directly to the input jack
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Old 9th November 2007, 01:52 PM   #114
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Holger,

Do you think it will be a problem when transfering the trace to the PCB with the input section so close togethger? Even at 150%, the traces are touching where they shouldn't.

I don't mean to sound critical or picky. I am grateful!


Thanks,

Vince
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Old 9th November 2007, 01:57 PM   #115
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Hi Vince,
don't get fooled by the screen display. It's a 600 dpi pdf with plenty of space between the traces and the pads. Just print it on a decent printer and you'll see.
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Old 9th November 2007, 02:34 PM   #116
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QUOTE]don't get fooled by the screen display[/QUOTE]


Ok, thanks!

BTW- I just printed it on a HP 1200 Laser and there is plenty of room.

Thx.
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Old 9th November 2007, 03:32 PM   #117
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I should say that I consider the above version as far from being "final", so it might be a good idea to wait a little before you get started.
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Old 10th November 2007, 02:17 AM   #118
traw is offline traw  United States
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The Vgds max at 25 volt. What does the 3 legged fuse see in Aleph J? Anything to worry about if using 26 volt or so supply?
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Old 10th November 2007, 08:54 AM   #119
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Quote:
Originally posted by traw
The Vgds max at 25 volt. What does the 3 legged fuse see in Aleph J? Anything to worry about if using 26 volt or so supply?

even 27 can be fine ;

more .............. poof!
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Old 10th November 2007, 11:58 AM   #120
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> even 27 can be fine ;

You probably have not been listening to Mr. Curl on the Blowtorch thread.

Whether the JFET will blow at 27V is one thing, whether it still operates properly is another.


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