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Old 20th September 2002, 09:22 AM   #71
Jens is offline Jens  Germany
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Join Date: Feb 2001
The PDF was made stray ahead from the Gerber file. To be clear, don’t reverse the layout in the PDF, simply put the top-layer-layout not face-to-face, as the bottom-layer, to the board, but the printed side of the layout shows to you. Alternatively, you can use the appended file in which the top-layer-layout is mirrored and all the holes are shown. 2Bak, may I ask you for commend (confirmation) – thanks.
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File Type: zip zv4 layout.zip (34.4 KB, 224 views)
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Old 20th September 2002, 09:44 AM   #72
2Bak is offline 2Bak  Denmark
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Join Date: Apr 2002
Ok, Jens, that's true !
On our pcbs the two sides are correctly matched, but mirrored compared to Nelson's.
This means in our case that the bottom side will be the component side and reverse. No problem.

We made 6 nice pcbs, so we won't do it over again. Two pcbs for a single ended zen4, and four pcbs for a balanced z4 version.

regards Jan
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Old 21st September 2002, 02:26 AM   #73
RKH is offline RKH  United States
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Location: Colorado, USA
Default Pen Zen (V4) Pre-amp

Is the Bride of Zen still a suitable pre-amp for Zen V4 given its input buffer?

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Old 21st September 2002, 01:54 PM   #74
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Location: Flensburg
Default active x-over (6 dB/oct) in ZEN V4

I want to use the ZEN V4 for my tweeter. Is it possible to reduce the value of the capaciter C2, so that the low frequency rolloff beginns at 2000 Hz with 6 dB/oct?

Is there a possibility to this with the high frequency rolloff, too?
(e.g. midrange 1500 Hz)



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Old 21st September 2002, 08:56 PM   #75
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Join Date: Mar 2001
Yes, but you have to remember that the feedback to the
input is taken after the cap, and so while you are feeding
the tweeter through your filter cap, you must provide a
path for feedback which is before this cap. The easiest
solution is to leave the original caps in place, but tap
off before the original output caps and feed the tweeter
through the filter cap you want to use.
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Old 8th February 2013, 11:24 AM   #76
Luda is offline Luda  Germany
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Default Zen V4 Gerber-Files


I'm afraid the link to the Gerber-files on pasdiy.com has been removed.
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Old 8th October 2014, 03:04 PM   #77
Luda is offline Luda  Germany
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Join Date: Jul 2006
Originally Posted by Luda View Post

I'm afraid the link to the Gerber-files on pasdiy.com has been removed.
And the text isn't in the right order:

Bring the amplifier up slowly using
check the temperature of the heat every few minutes. Check for burning smells. Readjust R4 after an hour.
Thanks to Karen Douglass, Wayne Colburn, and Desmond Harrington for their help.
a Variac and watch the voltage across R0. If it does not exceed .7 volts or so, then[...]
And "conclusion" isn't bold
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