NAP-140 Clone Amp Kit on Ebay - Page 4 - diyAudio
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Old 16th January 2008, 01:21 AM   #31
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I lost my copy of the Chinese insert that came with this kit. If someone would kindly post, I'll pass it on to a co-worker who will translate it and I'll post it back.
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Old 16th January 2008, 10:50 PM   #32
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The kit comes with this instruction sheet/parts list and the schematic previously posted. I'll look into getting this translated.
Attached Files
File Type: pdf amp.pdf (74.2 KB, 2708 views)
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Old 17th January 2008, 04:42 AM   #33
al2002 is offline al2002  India
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Is the output stage protection circuit included in this implementation? There are NAIM clone boards out there that leave it out.
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Old 17th January 2008, 07:06 PM   #34
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This second instruction sheet recommends addition of speaker protection. The kit does not include it.
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Old 27th January 2008, 08:55 PM   #35
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Hi,

I am planning on getting one of these kits off ebay.. I want to build something to power my recently finished Usher 701's (parts express kit but my own cabinents).

Can anyone point me in the direction or recomend a good power supply design suitable for this amp kit??

Thanks in advance.
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Old 30th January 2008, 11:42 AM   #36
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Well i ordered one of the 'improved' NAP140 kits they now have on ebay. The layout looks to have changed a bit and the board is white.

http://cgi.ebay.co.uk/IMPROVED-POWER...sid=p1638.m122

Any help with power supply designs?? My only amp building experience is with a briangt chip amp. I could use some advice.
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Old 30th January 2008, 02:56 PM   #37
rocky99 is offline rocky99  United Kingdom
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Flappy

Here is an article on a simple Power Supply that will get you going:

http://sound.westhost.com/psu-wiring.htm

Good luck.
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Old 30th January 2008, 04:50 PM   #38
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Thanks Rocky99,

so it looks like a simple power supply will do the trick...

I want to order some parts so ill guess ill go with the same rectifier (mur860 diodes) and general circuitry as i built for my chipamp specifically this design

http://chipamp.com/images/ps.gif

but i will probably bring up the capacitance a bit with multiple filter caps
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Old 5th February 2008, 11:21 AM   #39
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OK i have built my boards what is the next step?
I have found a couple of huge Erie 22000 uf caps and a pair of decent metal cases diode bridges, with a spare 300 va daul secondary tranny this should make an ok basic psu.

However i dont know how i should start to test these things, where the connections go or indeed how to start biasing them.

Any help gratefully recieved.

Phil
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Old 6th February 2008, 01:02 PM   #40
Dave S is offline Dave S  United Kingdom
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Anyone care to comment on the suitability of TIP41C/42C as drivers. The gain and (therefore) GB product is rather low compared to the parts Naim use. Cob is also 2X the Naim parts, I wonder if this mucks up the frequency compensation (base resistors and RC in parallel)?

The VAS Tr is a 2SD667 - this looks OK to me.
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