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Matched IRF FET's

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#61
hc167 said:
Tarasque:

I got the FETs today. thanks. by the way, what are those number on the FET stand for? for example, on two of the IRF240, I have 4190 and on the other one I have 4195. what is that mean? thanks a lot.
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The little stickers on the fets are the Ugs in mV. So 4195 means an Ugs of 4,195V.
The highest number minus the lowest number is the deviation of the set in mV.
I aim at 2mv for a pair and 5mv for a set of 3.
The Ugs is measured with a 5 digit meter and the last one is rounded.

I hope this helps.
 
#66
dinu said:
Any word on when I'll see mine?
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Hi Dinu...You are defenately not forgotten!!!

As you need a close match, more fets are currently on their way to me. Normally it is not a big problem to get 2 sets of 9240 out of the fets ordered, as I get fets from the same wafer.

You are on the top of the list. As soon as the fets arrive, I will make the sets and send them to you.
 
#78
dinu said:
Marcel
I got those babies yesterday. Nice!!
Thank you.
I was curious how you match them though. Did you make your own test bench or buy one or what? How do you keep them all at the same temp when you test?
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Dinu,

I'm glad that you liked the result.

I use a temperature controlled 15mm aluminium plate where all the fets put on during the process. Then each fet is measured with a 5 digit meter. The result is automatically stored in a excell sheet that prints the labels.
i use the excell sheet to sort the fets and plan the sets as well as keep track what amplifier has what sets.
 
#80
Tarasque said:


Dinu,

I'm glad that you liked the result.

I use a temperature controlled 15mm aluminium plate where all the fets put on during the process. Then each fet is measured with a 5 digit meter. The result is automatically stored in a excell sheet that prints the labels.
i use the excell sheet to sort the fets and plan the sets as well as keep track what amplifier has what sets.
Click to expand...

Nice setup Marcel... I have the meter to do this, but the temp control, etc... not. I'm glad I decided to just get them matched from you instead of doing it myself.

BTW, my FETs arrived today also and look great. Thanks for such great service!

Best regards,

Chris
 
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