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-   -   Is it worth building this Elektor NMOS BUZ23 amplifier (http://www.diyaudio.com/forums/elektor/185183-worth-building-elektor-nmos-buz23-amplifier.html)

routhun 16th March 2011 05:20 AM

Is it worth building this Elektor NMOS BUZ23 amplifier
 
1 Attachment(s)
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.

yd1cvj 8th April 2012 03:18 PM

Hi routhun,
Did you make it ?

manicjovica 17th May 2013 07:03 AM

Build it!
 
Quote:

Originally Posted by routhun (Post 2505350)
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.

sivan_and 3rd May 2014 02:06 PM

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 ?

sivan_and 4th May 2014 08:10 AM

[IMG]file:///D:/My%20Downloads/20140504_131705.jpg[/IMG]

ishiru 4th May 2014 08:36 AM

^it's still on your harddrive ;)

sivan_and 4th May 2014 09:04 AM

http://i740.photobucket.com/albums/x...504_131705.jpg

sivan_and 4th May 2014 09:09 AM

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

sivan_and 4th May 2014 10:27 AM

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