NAP-140 Clone Amp Kit on Ebay - Page 24 - diyAudio
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Old 24th July 2008, 01:01 PM   #231
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Hi and thanks for the replys, i have checked the sig ground and were its solderd to the board both grounds are solderd in the same place? and i have checked it with my meter and they are connected.
I tried to make a power supply? that looked so easy to make!!!!!
I bought 10 10,000 uf 63wv caps as i was going to use 5 per bank
My first try well that went up in sparks and one of the caps was like expanding foam and i had the plug in my hand ready to switch it off,i was to slow.
The supply i have now works? i have 3 rails 40v+ .0. 40v- the 0 or ground i fitted to the 0 rail and the 40v+ to the red wire and the 40v- to the black wire and the ground wire nr the input i put to the 0v rail.
I did not put a feed to the input as i want to set the amps up.
I also fitted two wires so i could the VR with my meter but when i checked them no volts were found and thats the same with the other board.
I will try and att some pics.
File to big?
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File Type: jpg mvc-004s.jpg (52.1 KB, 2765 views)
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Old 24th July 2008, 01:03 PM   #232
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Power supply, i have built.
Its not the best looking but we have to start somewere.
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File Type: jpg mvc-001s.jpg (66.4 KB, 2637 views)
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Old 26th July 2008, 09:51 PM   #233
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Power supply is now sorted the right way!!!!!!! and i get the right + and - volts and 0.
Now to see if i can get the amps working?????
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Old 26th July 2008, 10:23 PM   #234
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Default Power Supplies

Here are a few quick drawings of some PS schemes for the 140c:

The first here is what I am currently using:
http://i240.photobucket.com/albums/f...gndschmweb.jpg

Click the image to open in full size.


Here is a drawing of where I was considering moving the Ground star too:
http://i240.photobucket.com/albums/f...ndschm2web.jpg

Click the image to open in full size.

Here is what I believe to be the the NAP PSU scheme (ala NAP250):
http://i240.photobucket.com/albums/f.../NAP250PSU.jpg

Click the image to open in full size.

It has been a number of years since I've had a 250 so if the drawing is incorrect please correct me.
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Old 26th July 2008, 11:18 PM   #235
john65b is offline john65b  United States
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On your last pic, you need to send each + and - from each rectifier to the + and - of each cap. then join the + for the first cap to the - of the second cap. This will serve as your 0V power ground. The remaining + from the second cap and the - from the first cap are your positive and negative rails.

So each rectifier has its own cap. then just join the +/- from both caps and form your 0V

Whoa- wait. What are the green lines from the tranny? Are they centertaps? I thought you had dual secondaries.

I have never seen dual centertapped secondaries, so wait for someone else to chime in.
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Old 27th July 2008, 02:17 AM   #236
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Default NAP250 PSU

Quote:
Originally posted by john65b

Whoa- wait. What are the green lines from the tranny? Are they centertaps? I thought you had dual secondaries.

I have never seen dual centertapped secondaries, so wait for someone else to chime in.

Yes, sorry, I forgot to mention in the drawing. The toroid has dual center tapped secondaries.-- Oh, no, I did mark the drawing correctly.
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Old 27th July 2008, 03:06 PM   #237
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Thanks for the info.
Still trying to find my problems.
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Old 27th July 2008, 03:55 PM   #238
john65b is offline john65b  United States
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I think you should be able to do as I stated previously, and do not use the secondary centertaps at all. You would just cap the centertap ends individually (do not connect the two centertaps together or to ground).

You may want to wait to have someone confirm me tho...
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Old 29th July 2008, 01:09 PM   #239
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Hi to all, is there anyone in the uk who can look at my boards i have built?
I am having no luck at getting them to work,one amp when trying to set the VR volts as in the manual will not go below 100mv.
The other amp there is no volts at all.
I have checked all my soldering and it seems ok,nothing has burnt or gone pop.
I am using a 35.0.35 transformer which is giving me 41v+ and 41v- and a 0 rail.
As this is my first full kit build this is all new to me.
Can i thank all who have helped me.
If you can help please pm or email me my email is geowhitt@netscape.net
Many thanks.
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Old 30th July 2008, 09:24 PM   #240
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force of 1/2,

You should stick with the top diagram as using the bottom scheme will increase the loop area of the high current capacitor link, making EMI worse.
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