Amplifier HiFi NS450 - 200W

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#62
jacques antoine said:
Thanks Renatoscp for the link and sorry for assuming wrongly that you were a pirate!
Cheers,

Jacques
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Alright buddy, no problems, would be enough to ask, not including offensive images ...

The test version is for 30 days, but works perfectly for 30 days. After this period you can choose to buy, uninstall, or format your machine and reinstall, this procedure is not illegal, but requires time and money.


Not originally posted the link in the open because the topic refers to the amplifiers, not software ...

A hug!
 
#65
photos of plates of the amplifier and switching power supply NS_450 NS-450

An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.
 
#67
1K- Pot

what is the purpose of 1k 50% keyzA pot...plz explain....

thanks in advance

renatoscp said:
Regards!

Here I am providing some information about this great amp, designed by friend Naldo Santos, which surprised me for its sound quality compared to other amplifiers bipolar gender, and also for its simplicity of construction!

It is a simple scheme, with parts already known to many here, but the big hit in the final quality occurred due to several days of tests, adjustments and changes made by friend Naldo Santos, to arrive at a level of sound spectacular both in average, bass and treble. The circuit is very calibrated, and below I'm posting a video I made of assemblies.

The source used was also designed by friend Naldo Santos, based on already established a circuit with IR2153, using a transformer EI33 EI35 or salvaged sources ATX PC.

The music used is a Portuguese version of the famous "Knockin 'On Heaven's Door" by Guns, voice Zé Ramalho. I chose this song because it has a range of excellent mids and treble, so he could show that a mosfet is rather able to reproduce those frequencies with the same intensity as bipolar, or even with advantage over them.


follows:

An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.



Video test:

http://www.youtube.com/v/mHCxRu7NKbQ

Demonstration of adjusting operating frequency of the switching power supply:

http://www.youtube.com/v/rcrKdByaG5I

If you are interested in assembling, warn that I post here the PDFs of printed circuit boards.

ps. Sorry for my horrible english.

Greetings,
Renato
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#70
Hallmar said:
Why is the inductor for the output so huge on your PCB?

What is the ampere rating for it?
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Does not look too huge to me. It is only slightly bigger than 10 ohm/3W resistor. Actual value of inductance is not very critical.

In an amplifier I built in the past (based on 2N3055), I wound a thick enameled wire on a resistor (2.2ohm/3W IIRC), making sure that both had the same number of turns.

Here is original notes from the OP:

http://www.diyaudio.com/forums/solid-state/238768-amplifier-hifi-ns450-200w-2.html#post3797964
 
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#72
Hallmar said:
How much power is disspated in the Mosfets?

I'm wondering how big the cooling units for the mosfets need to be.

What i have is 5 x 3.5 x 0.8 cm individuali for 2 mosfets. So it's 4 cooling units for the 8 mosfets.
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Friend, I use a PC processor cooler kind of big, gifted his ventuinha and he realizes refrigerate 4 mosfets. By using mosfets, this amplifier heats up very little compared with common transistors:


Teste AMPLIFICADOR + FONTE NS450 - YouTube
 
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