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Old 30th June 2008, 09:42 PM   #11
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Location: rochester
Hey,

I was hoping someone could answer my question relating to matched transistors, which in my research has come up as something that is fairly important:

http://www.passdiy.com/pdf/mos.pdf

Unfortunately, the only test equipment I have is a multimeter. If anyone knows where I might be able to find matched transistors for this project, it would be greatly helpful.


Also, Brian of Chipamp.com got back to my email and mentioned that someone here might have a copy of the Aleph service manual, which could clarify some things for me. Anyone know where I could get a copy?

Thanks
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Old 30th June 2008, 10:40 PM   #12
Magura is offline Magura  Denmark
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Quote:
Originally posted by systemerror909
Hey,

I was hoping someone could answer my question relating to matched transistors, which in my research has come up as something that is fairly important:

http://www.passdiy.com/pdf/mos.pdf

Unfortunately, the only test equipment I have is a multimeter. If anyone knows where I might be able to find matched transistors for this project, it would be greatly helpful.


Also, Brian of Chipamp.com got back to my email and mentioned that someone here might have a copy of the Aleph service manual, which could clarify some things for me. Anyone know where I could get a copy?

Thanks
Short of a power supply, grab a 12V car battery as power source for matching mosfets. Just about any multi-meter will do.

But didn't you want to build a mini-A ? As far as I recall, there is only one fet per bank, so no need for matching. Just grab the first TO-247 size mosfets you see on your bench, and you're good to go. All you need to consider, is that you need 2 P-channels and 2 N-channels. Those could be anything from IRFP044 and all the way up to IRFP450, the P-channels are a little more limited in range, as they stop at IRFP9240, but again any TO-247 P-channel will do, so it's just gotta be IRFP9xxx.

Magura
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Old 1st July 2008, 05:11 PM   #13
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Here is the parts list for Brian's PCbs:

http://www.chipamp.com/diyaudio/mini-A.xls

In the notes it says they should be matched for VGS.
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Old 2nd July 2008, 07:13 AM   #14
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Hello Ryan, you can order the PCB for make an Aleph 30 here:
http://www.chipamp.com/orders.shtml

There's not a guide but an excel sheet where you find all the component end the corrispective part on the pcb when you solder.
http://www.chipamp.com/diyaudio/mini-A.xls

You can match the IRFP240 and the IRF9610. If you have a problem, in this forum someone sell the mosfet already matched (talk with user Tarrasque)
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