IXTH16N10D2 for amplifier use ? - diyAudio
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Old 12th December 2014, 01:12 AM   #1
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Default IXTH16N10D2 for amplifier use ?

Hi forum

I had a discussion with an old guy ( he has been working as a radio mechanic for many years ), he claims that mosfet's with even high Ciss gives good result in audio amplifiers, just don't use high Ciss in low power amps like headphone amplifiers, he says. I think i've always heard, that we want the lowest Ciss as possible ...right ? Can IXTH16N10D2 mosfet be used for a simple source follower lets say 1 - 2 W into 8 Ohm speakers ? I want to use lamps as load and maybe 40 - 50 VDC powersupply ?

I already got a couple of these IXTH16N10D2 mosfet's, which has a very high Ciss of 5700 pF. Take a look at the datasheet, which actually tells that it can be used for Audio amplifiers !

http://ixapps.ixys.com/Datasheet/DS1...16N10D2%29.pdf
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Old 12th December 2014, 07:17 AM   #2
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It's all in the way you drive them to obtain good results.
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Old 12th December 2014, 07:27 AM   #3
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did I read correct that it should have negative voltage bias for proper working, like tubes?
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Old 12th December 2014, 08:59 AM   #4
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Somewhere around -3V for ~4mA Drain current. Interesting devices. Would be a bit difficult to use them in a quasi output stage since it would require a 3rd rail to bias the lower. As a SE follower they would work pretty good given the right drive circuit. Given enough heatsink you could go to 10 watts or more with a pair, one as follower and one as CCS.

Last edited by jerluwoo; 12th December 2014 at 09:04 AM.
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Old 12th December 2014, 09:02 AM   #5
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Certainly they are working but driving must be appropriate. I use the IXTK82N25 the Quasi N-MOSFET amp circuits and the result is better than the IRF(P) N-FET series
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Old 12th December 2014, 12:50 PM   #6
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Default depletion can be used for audio

I had another depletion mosfet model (IXTT20N50D)
and driven from the low resistance source it shows indeed good performance, at ~1A idle, the files attached.

Moreover it can drive from the drain a transformer like from anode in tube amps but with significant more power.
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File Type: png sch.png (18.8 KB, 147 views)
File Type: png sine.png (13.8 KB, 144 views)
File Type: png acsmall.png (8.0 KB, 141 views)
File Type: png fft.png (7.2 KB, 141 views)
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File Type: asc IXTT20N50D depletion ef.asc (2.0 KB, 3 views)
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Old 12th December 2014, 01:02 PM   #7
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I have test the N-MOS 200 with IXGR60N60C2D1,for function only.
It was playing ,i can't hear any problem,but i haven't test on a scope yet.
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Old 12th December 2014, 09:05 PM   #8
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Indeed OP's devices should work well in something simple. Driven from a low impedance source the following I imagine would sound pretty good after tuning the gate resistors. According to datasheet curves it should idle at ~1.5A and manage close to 6 watts into 8 ohm. OF course burning 75 watts at idle.
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Old 12th December 2014, 09:14 PM   #9
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You originaly asked for a small follower. Well here is one Nelson posted true C1 would probably need to be larger as this was intended as a tweeter amp so the small value adds
some added protection to the tweeter in case of a turn on thump.Simple follower
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Old 12th December 2014, 09:23 PM   #10
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Quote:
Originally Posted by woody View Post
You originaly asked for a small follower. Well here is one Nelson posted true C1 would probably need to be larger as this was intended as a tweeter amp so the small value adds
some added protection to the tweeter in case of a turn on thump.Simple follower
It won't work for depletion devices. Even at 0V Vgs the OP's devices will be dumping 25A+. A follower can be done as simply as my last post, moving a single resistor.

Edit: oops of course adding an input capacitor as well.
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Last edited by jerluwoo; 12th December 2014 at 09:25 PM.
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