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Old 6th August 2002, 12:55 AM   #11
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Default Update

For those who care, I ordered 250 IRFP240 and 150 IRF9610. With a bit of my time, this should yield some very good matched sets. I just wanted to make sure that people realize that I take this seriously, and do not skimp on getting good results. I match my resistors to .1% also (NOT selling these)...

So far, I have around six new clients. I think this type of collaboration (including the fine efforts of many many others) helps us all out who couldn't afford to get boards made or buy enough fets on our own. Can't wait to hear the details on the new projects. If my aleph takes much longer to assemble, perhaps it will become an Aleph-X or X100RE.

Thanks to all who have answered my never ending questions!

Dale
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Old 6th August 2002, 12:58 AM   #12
BrianGT is offline BrianGT  United States
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Dale,

I would like to buy 4 matched sets of IRF9610 mosfets (for 4 channels). What would you charge for just the IRF9610s?

--
Brian
 
Old 6th August 2002, 01:04 AM   #13
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Brian,

email me offline...

Best Regards,

Dale
dherman@ksaria.com
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Old 17th August 2002, 04:54 PM   #14
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Default 9610 matching results

Hi Guys,

Here are the 9610 matching results. I promise to finish the 240's by next weekend. I will be away until then...

Dale
Attached Files
File Type: zip 9610.zip (15.3 KB, 93 views)
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Old 17th August 2002, 09:59 PM   #15
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Hi Dale, Guys,

I went ahead and ordered some extra 9610's (from Dale)
1.)The hope is to build a second Aleph at a later date.
2.)It sticks in the back of my head that in an old thread (un-findable with "Search") Mr. Pass said (not a quote, just from memory) that it does little good to match the differiential FETs. That the Pass method is to substitute 9610's until the DC offset disapears.

Question:
Does any one have experience with matched 9610's providing good results with a low DC offset voltage, or will it still be necessary to try several devices?

Slowly, but surely, I'm getting there.
Rodd Yamas***a
 
Old 22nd August 2002, 10:23 PM   #16
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Default IRFP240's matched

As promised, here are the results of the output fet matching.

Special thanks to my wife, Rosie, for labeling all of the fets and to Peter Daniel for suggesting some test sockets which made testing easier.

I will sort out and send all packages on Saturday.

Best Regards,

Dale
Attached Files
File Type: zip irfp240.zip (4.1 KB, 73 views)
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Old 22nd August 2002, 11:13 PM   #17
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Info on prices:


4 Sets of # IRFP240, 2 pairs IRF9610 Plus 2, Total #, Price
A5: 3 1 18 60
A4: 6 1 30 100
A3: 2 1 14 50
A2: 6 1 30 100
A1.2 12 1 54 250

Input Fets Only: Matched pairs plus spares:

2 6 25
4 12 50
6 18 75

Plus shipping: (US = $3.00), $5.00 WW

Paypal adds 3%

Best Regards,

Dale
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Old 24th August 2002, 02:17 PM   #18
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Default Shipped

Hi Guys,

The following shipments went out this morning via USPS:


Rodd Yamashita - IRF9610's
Harry Campbell III - Aleph 3 FETS
Robert Cowan - Aleph 2 FETS
Walter Chick - Aleph 5 FETS

All of the matched sets/pairs are marked on the outside of the static bags. If you want to know the values, check the posted results. All of the values are 4.XXX Volts Vgs.

Good luck on all of your projects.

P.S. Several people have expressed interest. I need to get form commitments (payment), so that you don't miss out. I may not do this again. It takes too much work...
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Old 24th August 2002, 02:34 PM   #19
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Thanks Dale,

It's been my plesure doing business.

I'll drop a line when they arrive.

Rodd Yamas***a
 
Old 24th August 2002, 04:20 PM   #20
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Thanks much Dale. It is greatly appreciated.

The reason for two sets is:

One set is for me.

The other set is for when I blow up the first set.

If I bought only one set then I would violate the Murphy's Law corallary about parts conservation.

Actually, the second set is going to be the "raison d'etre" to learn CAD for my Fall semester students.

I haven't selected heatsinks yet. I've made heat dissipation and heatsinks research into an exercise for my summer intern.

I am leaning toward PCB's rather than PTP.

Thanks again,

Chris
 

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