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Old 1st February 2012, 06:41 AM   #21
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Location: Spain
Thanks Ashaw. This is what i need:
- 1 kit for a protection board
- 1 kit "everything else"
Speaking about mosfets, Zhoufang can match them within 0,01V, but at 500mA. This mosfets will work at 2A/ 16V. We could propose to zhoufang, matching them in this conditions (via a new groupbuy).
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Old 1st February 2012, 08:58 AM   #22
AndrewT is offline AndrewT  Scotland
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Zoufang quotes lots of significant figures on the measured FETs he offers.
But his accuracy is stated as +-1% in an Email to me.

eg @ 503mA in his testing jig, he will measure 2.0961V, but the tolerance is +-21mV

When a batch of his "matched" devices are re-measured they don't equal what is written on them. They don't even arrive at the order of Vgs the numbers on them would indicate.

Unless he is prepared to specially modify his measuring procedure to suit the F5x, then Zoufang is not a suitable supplier.

I was sold 4 quads sets for two F5x stereo amplifiers.
It turns out I got the standard offerings as described at the beginning of this post, not what I was promised and quoted for.

As supplied they were effectively useless for an F5x.
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Old 1st February 2012, 09:38 AM   #23
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by AndrewT View Post
Unless he is prepared to specially modify his measuring procedure to suit the F5x, then Zoufang is not a suitable supplier.
Andrew,
Do you know of any viable alternative? I know that more of us are still looking for the mosfets for the F5X build.
Cheers,
Nic
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Old 1st February 2012, 09:45 AM   #24
AndrewT is offline AndrewT  Scotland
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Persuade Zoufang to come clean and stop describing his devices as "matched". They are not.

Then see if he is willing to modify his procedure to give us effective sets with near equal Vgs at 2A of Id.
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Old 1st February 2012, 02:00 PM   #25
JBdV is offline JBdV  Netherlands
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2 kits for me please ... (protection as well as anything else)

JBdV

Last edited by JBdV; 1st February 2012 at 02:02 PM.
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Old 1st February 2012, 06:09 PM   #26
MaHo is offline MaHo  Slovakia
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Hi Alexis

If I understand right the kit will contain everythig to build protection board except trafo and relais for 43 USD

Thanks Martin
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Old 1st February 2012, 06:26 PM   #27
ashaw is offline ashaw  Australia
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Correct. There is also a 2nd GB that is being mused for all the additional small parts that there has not been a GB for (ie no FETs or PSU caps) but no cost has been announced yet.
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Old 1st February 2012, 07:16 PM   #28
MaHo is offline MaHo  Slovakia
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Thanks for reply
Is it posiblle to put more small SMD caps and resitors then necessary to first GB. When I lose something?

Thanks Martin
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Old 1st February 2012, 07:26 PM   #29
ashaw is offline ashaw  Australia
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There will be a few aditional of each value.
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Old 2nd February 2012, 12:30 PM   #30
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I am confused. There is a 'protection board GB' and it's components kits already. Can all these be group together and be offered as one? If not, I'll like to put my name on this list as well.

Thanks.
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