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Old 27th February 2004, 08:32 AM   #81
usekgb is offline usekgb  United States
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Are you getting close to finishing yours Mark? I'd love to see it. I was working on my Zen V4 today, and broke the tap off in the heat sink. . I'll have to get it out and finish it up before I can start on my AX's.

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Old 27th February 2004, 01:20 PM   #82
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Will all you at work today.. Getting that tap out is actually pretty easy.
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Old 27th February 2004, 06:34 PM   #83
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Originally posted by Mark A. Gulbrandsen
However, it was a wonderful evening and I rarely pull out the old Racal 5003.... I was just way too tempted...
I understand. I like to watch my hard disk get defragmented.
It gives the illusion of progress.
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Old 27th February 2004, 09:20 PM   #84
JCoffey is offline JCoffey  United States
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You dont know how good that makes me feel to hear, Mr. Pass. I work with computers for a living, and I have been known a few times to watch it get the ole Defrag....
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Old 28th February 2004, 03:22 AM   #85
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Default hi power version

would anyone please inform me
how to select r2 r3 r42 r43
for different power o/p and different speaker impendance
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Old 28th February 2004, 08:53 AM   #86
hifiZen is offline hifiZen  Canada
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These resistors should be the same as R5, R6, R41, R41... These are known as source resistors, and the calculation to find their value is explained here , under 'Calculating Circuit Values'.

The 'total bias current' needs to be known first, and you can use the spreadsheet to figure that out based on your desired power output and speaker impedance... Calculation Spreadsheet
- Chad.
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Old 29th February 2004, 05:47 AM   #87
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"I cant wait to see results from mark's amp... i hope it goes well "

I might have some results to post tommrrow..... The first board has been completely built up since Thursday night.... Just have to wire up a temp. power supply and see what she does.....

Regarding toroids......

A friend just ordered a Victoria Magnetics toroid for his Aleph 3 project and it ran him less than 80.00 for a custom 500VA toroid. I also bought a custom VM toroid for my Mini Aleph. That was a 320 VA unit and it ran me about 60.00 shipped. These are super reasonable prices for custom trannys and the quality is as good as the best out there. You might consider getting one large unit wound for your multi channel X.

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Old 29th February 2004, 05:59 AM   #88
moe29 is offline moe29  United States
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i finished populating the second channel tonight. Now I'm just
mulling over wether to make mono-blocks or a stereo amp. Since
i hate building chassis... i'm wondering if i should just go for both
channels in one chassis, sharing a transformer and PSU. I figure
something like a 750VA transformer should handle both channels
without any problems, with 15 volt secondaries... or is this a bad idea?
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Old 29th February 2004, 06:16 AM   #89
Prune is offline Prune  Canada
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The thing I like about monoblocks is that you can use shorter speaker cables.
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Old 29th February 2004, 08:09 AM   #90
yoke is offline yoke  Croatia
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What is easiest way to check if mosfet ( IRFP2410 ) is broken or not...
I would like to check mosfets before I solder them down...


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