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Old 31st August 2002, 09:42 AM   #41
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Default Re: Print no problem

Quote:
Originally posted by chris ma
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
I print whole PDF document without any problems, direct from browser, without saving it first...
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Old 31st August 2002, 09:14 PM   #42
2Bak is offline 2Bak  Denmark
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The PSU example on fig. 6 in the ZEN 4 pdf-file, I guess I would have to redesign this if I do not plan to use earth AC ground? We do not have earth ground in my place, and my other equipment do not use it either, including my BoSoZ.

My setup would be:
230v AC, non earth grounding
Two 300VA, 2*18 v toroids

What should I alter then?
Would chassis grounding make any sense without AC grounding?

regards
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Old 1st September 2002, 04:39 AM   #43
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The Digikey part number P1246-ND, Panasonic part number ECE-A1HFS221 has apparently been discontinued. See http://www.panasonic.com/industrial/...pdf/DC023.pdf. Also see the Digi-Key front page, http://www.digikey.com/ and lookup the part number P1246-ND and it appears that digikey no longer has the part. According the PDF from panasonic, the ECEA1HFS221 replacement is the EEUFC1H221(Also available at Digikey), but is varies in specification(both slightly in mechanical and electrical specifications). I was wondering if Mr Pass would give the go ahead and use the replacement that panasonic recommends. Thanks for any responses.
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Old 1st September 2002, 06:56 PM   #44
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Hello,


Well, I finished mine Zen - V4 !
I will try to get some photos and post them.

It have much more power than original Zen !
As usual, clear sound without any audiable hum.
I used smaller heatsinks than required, but it is working very good and everything is ok.
I run my mosfets and heatsinks above 90 C, after some time
you can feel the characteristic warm smell in the room !

As as expected, another excellent and 'simple' design.


Thanks to Mr.Pass and his crew.


Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip
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Old 1st September 2002, 07:55 PM   #45
fcel is offline fcel  United States
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Kristijan,

You're fast! I just mailed in my check for the pcb!

While you're in the process of getting the photos taken, could you take a look at some of my questions that I posted previously regarding to Balanced Channels. I guess I'm hungry for more power!

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)?

Thanks. Can't wait to see your photos!
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Old 1st September 2002, 08:26 PM   #46
paulb is offline paulb  Canada
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Quote:
Originally posted by fcel
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?
Costs are mostly based on transformers, caps, heatsinks and chassis. So I would bet they would be about the same.
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Old 1st September 2002, 08:52 PM   #47
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Hello fcel,


1. There is no need for matched transistors for Zen - V4, even for the balanced operation, as there are output capacitors.

2. The Aleph 5 cost little more.

3. For balanced operation you will need 4 channels (2 x 2),
and the 2 inputs on the 2 boards would be connected to the plus and minus of the XLR connector.
Same thing as Balance-25 at my website.

4. If you would like to build balanced version, than you must double the rating of the transformer-s.
The transformer for the two channels that are bridged, should have 35 - 38 VAC or so, and rating of minimum 400 VA.
How the wires on the seccondary will be connected depends on the type of the transformer.
I use custom made transformers, as here in Croatia there is a lot's of places where you can get them.



Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip
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Old 1st September 2002, 10:31 PM   #48
fcel is offline fcel  United States
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Kristijian ... Thanks for the response.

Just one more thing. Shouldn't the rating for each transformer be 600VA since you said the rating should be doubled? By 35-38VAC secondary, you meant two ~18V on the secondary side? So, to make sure I got this right, the rating of the transformer doubled but the secondary voltage remains the same?
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Old 2nd September 2002, 01:51 AM   #49
JoeBob is offline JoeBob  Canada
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fcel, for the transformers you want the same voltage but twice the current capacity, therefore twice the VA rating. Hope that helps.
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Old 2nd September 2002, 08:29 AM   #50
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Hello fcel,

If you have transformer with 2 x 18 V, then connect it with seccondary in series, so you can get 36 V.
400 VA would be minimum transformer rating for two channels.
For two balanced channels, use 800 VA as a minimum.


Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip
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