Is it worth building this Elektor NMOS BUZ23 amplifier - diyAudio
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Old 16th March 2011, 05:20 AM   #1
routhun is offline routhun  United States
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Default Is it worth building this Elektor NMOS BUZ23 amplifier

Always fascinated by this Elektor amp from late 80s, but never had access to the parts etc to build it. Recently found this schematic again on the web. Idea looks simple, drive the NMOS with a differential pair. Since it uses same transistor types, NPN/PNP, finding the matched devices can be easy. But this one uses a complex bias stabilization and temperature protection schemes. Don't have any idea about the sound quality etc? Has anyone build this amp? what is the experience?

This uses NMOS devices, BUZ23. I am not sure if they are still available, may be they can be replaced by IRFP devices.
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Old 8th April 2012, 03:18 PM   #2
yd1cvj is offline yd1cvj  Indonesia
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Hi routhun,
Did you make it ?
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Old 17th May 2013, 07:03 AM   #3
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Default Build it!

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Originally Posted by routhun View Post
Always fascinated by this Elektor amp from late 80s, but never had access to the parts etc to build it. Recently found this schematic again on the web. Idea looks simple, drive the NMOS with a differential pair. Since it uses same transistor types, NPN/PNP, finding the matched devices can be easy. But this one uses a complex bias stabilization and temperature protection schemes. Don't have any idea about the sound quality etc? Has anyone build this amp? what is the experience?

This uses NMOS devices, BUZ23. I am not sure if they are still available, may be they can be replaced by IRFP devices.
I made those amps for sale,both for hifi and PA.Very reliable amp, sounds good.Stabilization is simple in fact,an NTC thermistor is inserted in second diferential pair's current source to decrease bias for output mosfets.I used irfp250,irfp240,irf540,irf640,everything works.
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Old 3rd May 2014, 02:06 PM   #4
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I've build this on a vero board, used as a sub amp 5 years ago..now retired used IRF540 --2 nos drve 4 OHMS comfortably, can we increase power output if we use IRF240 and increasing voltage ?
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Old 4th May 2014, 08:10 AM   #5
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[IMG]file:///D:/My%20Downloads/20140504_131705.jpg[/IMG]
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Old 4th May 2014, 08:36 AM   #6
ishiru is offline ishiru  Indonesia
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^it's still on your harddrive
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Old 4th May 2014, 09:04 AM   #7
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Old 4th May 2014, 09:09 AM   #8
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the PCB on top is the said power amp on vero board, power by an half bridge SMPS (IRF2155 & 2x IRF840) below is the sub filter board
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Old 4th May 2014, 10:27 AM   #9
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