Finished Nmos200

dipsi111 · 21st May 2010, 12:57 PM

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

juma · 21st May 2010, 01:15 PM

Nice build

You plan to use it as a PA amp (judging by the in & out connectors)?

x84andrea · 21st May 2010, 01:18 PM

great

wally5 · 01:25 PM

Its a work of art, nice job what does it sound like.

dipsi111 · 21st May 2010, 04:16 PM

@ 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

sakis · 21st May 2010, 04:43 PM

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

dipsi111 · 21st May 2010, 06:41 PM

@ 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

sakis · 22nd May 2010, 07:49 AM

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

dipsi111 · 22nd May 2010, 04:37 PM

@ 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.

Cheers

nazirdigi · 13th December 2010, 02:14 PM

pls post the pcb layout

21st May 2010, 01:18 PM	#3
x84andrea diyAudio Member Join Date: Jan 2005 Location: Roma	great __________________ aleph 5 aleph 2 a liquido in costruzione

21st May 2010, 01:24 PM	#4
wally5 diyAudio Member Join Date: Oct 2009 Location: Auckland	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

21st May 2010, 04:43 PM	#6
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	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 __________________ SERVICE ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

22nd May 2010, 07:49 AM	#8
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	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 __________________ SERVICE ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

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21st May 2010, 01:15 PM	#2
juma diyAudio Member Join Date: Nov 2005 Location: Zemun	Nice build You plan to use it as a PA amp (judging by the in & out connectors)?

21st May 2010, 04:16 PM	#5
dipsi111 diyAudio Member Join Date: Aug 2009	@ 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

21st May 2010, 06:41 PM	#7
dipsi111 diyAudio Member Join Date: Aug 2009	@ 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

22nd May 2010, 04:37 PM	#9
dipsi111 diyAudio Member Join Date: Aug 2009	@ 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. Cheers

13th December 2010, 02:14 PM	#10
nazirdigi diyAudio Member Join Date: Oct 2009	pls post the pcb layout

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