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Old 30th August 2002, 03:11 AM   #11
jag is offline jag  United States
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Page 6 (pdf), the following line:

Adjust R0 so that the Drain voltage of Q1 is 1⁄2 the regulated voltage plus about 2 volts.

should read as:

Adjust R4 so that the Drain voltage of Q1 is 1⁄2 the regulated voltage plus about 2 volts.
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Old 30th August 2002, 03:39 AM   #12
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Default thx

thx mr.pass......
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Old 30th August 2002, 04:09 AM   #13
fcel is offline fcel  United States
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Default ZV4 Balanced Channels: Couple of questions

1. ZV4 article does not mention anything about transistors being matched. Do they need to be matched? If yes, match Q1 and Q2 only?

2. Power output for ZV4 in balanced mode is pretty much similiar to Aleph 5. Would the construction cost for ZV4 and Aleph 5 be about the same? Might some of the experienced DIYers know already from the top of the head?

3. For each balanced channel (I understand it'll need 2 boards), is it just a matter of connecting the two V+ together and the Grounding together from the 2 boards? The 2 inputs on the 2 boards would be connected to the plus and minus of the XLR input?

4. Now for the power supply, assuming we're using 2 transformers for unbalanced channels, how many transformers are required for balanced channels (and how are the secondary wires connected)?
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Old 30th August 2002, 09:45 AM   #14
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Unhappy print help

canīt print the article!

the only thing the printers do is print

error:ioerror, offending command: Startdata
STACK:

()
-filestream-
-savelevel-


this happens on several printers, part3 is no problem at all.

any ideas????

william
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Old 30th August 2002, 10:52 AM   #15
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Been waiting for this for a loooooong time

BTW, is there any chance of getting the PCB foil patterns as an image file? I have the ability to make PCB's from images

If not, how would I go about getting a pair of PCB's in the UK?
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Old 30th August 2002, 10:57 AM   #16
fcel is offline fcel  United States
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Check out http://www.passdiy.com/amps.htm for Gerber files to get your own pcbs made. Shipping is $20 for international.
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Old 30th August 2002, 11:02 AM   #17
fcel is offline fcel  United States
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Default printing

William ... Did you tried to print straight from the web page (one screen at a time)? If that don't work, I can't help you.
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Old 30th August 2002, 11:12 AM   #18
fcel is offline fcel  United States
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Default kit?

If I'm not mistaken, isn't this suppose to be the first amp kit from Pass Labs where pcbs, parts, heatsink, etc will be available as a kit? For now, I only see pcb for sale. A complete kit will be available in the near future? Nelson Pass has mentioned (last year?) that he's considering selling the Heatsink to the public .... which got some of us excited. I'm assuming it's for ZV4. Am I just totally mistaken?
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Old 30th August 2002, 12:13 PM   #19
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Default Print no problem

William,

I print the whole PDF doc with no problem.
I saved the PDF file first and then check the print as image button in the print panel.
Give it a try.

Chris
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Old 30th August 2002, 12:19 PM   #20
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Iīve got it now.

Changed the format of the first page (1mm smaller) and then it worked (donīt ask me why )

william
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