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Old 5th November 2009, 07:29 PM   #1
damage is offline damage  United States
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Default buz21 substitute

Looking for a BUZ21 substitute used in the outputs of the US Acoustics USA2100. I thought maybe trying a IRF540 but the RDS on is different.

Thanks!
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Old 5th November 2009, 08:16 PM   #2
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IRF540 should work. The lower RDSon shouldn't be a problem.
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Old 5th November 2009, 08:24 PM   #3
damage is offline damage  United States
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Thanks! I'll give it a try.
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Old 3rd February 2015, 08:33 AM   #4
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Sorry to bring this thread back from the dead but am running into issues with a similar amp (us acoustics ZED). I soldered IRF540N's and it seems to work but the sine waves are a bit fuzzy and within 2 minutes BOOM one of them leaks with no sign of damage.

Am guessing these amps don't like the "N", any insight on this Perry and if so should I use IRF540PBF or FQP33N10.

BTW this amp has 28 outputs so replacing them more than twice isn't fun, lol. Any help or advice is greatly appreciated.
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Old 3rd February 2015, 12:04 PM   #5
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I don't know. Email ZED to see if they have any suggestions.
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Old 3rd February 2015, 01:40 PM   #6
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I might just order 12 of the IRF540PDF and install 3 on each side (6 per channel) and see how it does under a light load. I would hate to solder 28 and have the same damn issue. If it does fine then I'll solder in the rest.

Never had much luck getting ANY info out of ZED, no matter how nice or simple the question may be.
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Old 3rd February 2015, 06:03 PM   #7
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Post or email me a photo of the amp board.
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Old 3rd February 2015, 06:30 PM   #8
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As you can see it originally had 12 fets per channel, I figured since it has four extra spots for fets on each ch I would throw those in as well. I used same .1ohm 5watt resistors so right now the amp has 16 .1ohm resistors on each side/ch.



Pic is not mine..but same exact amp.
Click the image to open in full size.
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Last edited by evianamp2011; 3rd February 2015 at 06:35 PM.
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Old 6th February 2015, 07:33 AM   #9
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According to ST Mosfet Cross Reference sheet IRF540 or STP20N10 (having a lower ID but higher RDS than BUZ21).

Going to solder in the IRF540PBF's, fingers crossed.
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Old 6th February 2015, 10:38 AM   #10
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Okay tried it with the IRF540PBF (used a total of 24 just like when stock), adjusted the bias and got a final idle of 0.95amp. So I tried it with the low pass set and a bass track, I notice that the amplifier quickly got hot, after 6-7 minutes the amplifier was very hot and internal fan kicked on.

I paused the track to see if it will cool down, well even after 15min of no audio the internal fan was still spinning.

I am afraid of giving it back to the owner and for it to fail...am starting to hate these Zed amps, lol.
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