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MOSFET Selection/matching in Objective2 amp
MOSFET Selection/matching in Objective2 amp
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Old 5th April 2013, 04:42 AM   #1
crispchicken is offline crispchicken  New Zealand
diyAudio Member
Join Date: Feb 2013
Location: Auckland
Question MOSFET Selection/matching in Objective2 amp

Hi there everyone, I'm getting to the end of my O2 build, and I've hit a bit of a stumbling block. When I ordered the MOSFETs for the amp, I made the mistake of getting a slightly different model for one because I mistook the name for the correct part. The P-channel I got was the standard one shown in the BOM (Fairchild FQU11P06TU - the datasheet is here in case you need to see it), now the problem is with the N-type I selected.

This one is the part listed on the BOM, and the one I bought was this part instead. Its specs seem very similar to me, but I don't know a lot about selecting transistors, especially FETs. I understand that they're supposed to be a "matched pair", and I'm wondering if that means a specific two parts that are designed to work together, or just having the specs matched "close enough" to work together.

Will this part work at all? Maybe just with a slight degradation in performance, or just straight up not work properly? I'd ideally like to use it and save the money and wait for postage in getting a new part, but I'm not going to ruin my amp with a few dollars of transistor if it'll make it sound like crap. Also, I was hoping someone could direct me to the correct part in to-92 (IPAK) package, since at this point, The p channel is a to-92 and the other is a huge to-220 and it looks silly to me. Obviously this isn't a big deal if it doesn't exist, but it'd be nice, since everything else on the PCB looks nice and symmetrical... I've found that appearances are very important in achieving ultimate sound quality

Thanks for your time!
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Old 9th April 2013, 12:20 AM   #2
crispchicken is offline crispchicken  New Zealand
diyAudio Member
Join Date: Feb 2013
Location: Auckland

Does anyone have some input on this? I'm nearly finished my build, I'm just about to order a couple of final parts and I need to know if I should try and find the recommended part or just stick with what I have.

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