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Old 21st May 2010, 12:57 PM   #1
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Default Finished Nmos200

Hello

Here are some pictures of my finished Nmos200 amp. I have used 2 pairs of IRFP240, +/- 50V power supply, upc1237 speaker protection, soft start, analog VU meters - based on project 55 from Rod Elliot.

Cheers
Attached Images
File Type: jpg Nmos200 - 1.jpg (99.7 KB, 708 views)
File Type: jpg Nmos200 - 2.jpg (48.2 KB, 627 views)
File Type: jpg Nmos200 - 3.jpg (62.6 KB, 591 views)
File Type: jpg Nmos200 - 4.jpg (53.5 KB, 575 views)
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Old 21st May 2010, 01:15 PM   #2
juma is offline juma  Serbia
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Nice build
You plan to use it as a PA amp (judging by the in & out connectors)?
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Old 21st May 2010, 01:18 PM   #3
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great
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Old 21st May 2010, 01:24 PM   #4
wally5 is offline wally5  New Zealand
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Its a work of art, nice job what does it sound like.

Last edited by wally5; 21st May 2010 at 01:25 PM. Reason: spelling mistake
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Old 21st May 2010, 04:16 PM   #5
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@ juma

It is not directly for PA but is intend for parties

@ wally5

The sound is superb - now I'm thinking to make another one to use it like main Hi-Fi amp

Cheers
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Old 21st May 2010, 04:43 PM   #6
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very nice work ...i will only ask and disagree regarding the extra pair of mosfets ...

is that so ??? since i cannot understand much from the pictures
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 21st May 2010, 06:41 PM   #7
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@ sakis

Yes there are indeed extra pair of mosfets. From the picture is not clear but they are of the PCB. The extra soure resistors are under the L shape aluminium bar and can not be seen on the picture. The extra gate resistors are visible on the picture. I've used the extra pair of mosfets because the amplifier will be used with 4 ohm speakers and I want to be on the safe side of SOA.
Power supply uses 500VA toroid with 2 x 35V secondary windings. Rectifiers are 35A/1000V metal blocks on the L shaped aluminium bar. It uses 2 x 10000uf/63V capacitors per chanell.

Cheers
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Old 22nd May 2010, 07:49 AM   #8
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if the cables the feed the extra pair of mosfets are twisted ... that is a problem ( they need to be apart ) then again it seems to me that these cables look very thin ... but may be i am wrong ...

see to that please or post a close up

regards sakis
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Old 22nd May 2010, 04:37 PM   #9
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@ sakis

the only cable wich is visible on the picture for the extra mosfets is the gate cable. The cable for feeding drain and source are not visible because they are under the L shape aluminium bar - and they are not thin or twisted.

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Old 13th December 2010, 02:14 PM   #10
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pls post the pcb layout
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