Amplifier HiFi NS450 - 200W

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#41
hanair said:
Renato, I have been looking for a simple discrete amplifier (simplicity should lead to less distortion), and your circuit looks very appealing (even though I am not an expert in circuit analysis). I especially liked the simplicity of your SMPS! Thanks for posting this project.
Click to expand...

Good afternoon friend!

Glad you liked it ... But I want to make clear that this project is not mine, but friend Naldo Santos' ... He was the one who hit the circuit on breadboard, tested, adjusted ... I just did the layout of the SMPS and amp ...

Merit to Naldo Santos.

Regards!
 
#42
some photos from the source NS_450 created by our friend Naldo Santos, pro staff does not believe it works very well.


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.

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.
 
#46
Hallmar said:
Where can i buy that transformer?

I saw the reply where you explained how to make it but i can't find it online.
Click to expand...

Friend, I drew this PCB in order to accept the majority of transformers ATX 400W PC up real then u can easily repackage them the junk from one of these sources ok ...

To reuse u need to disassemble it, and to do that, just leave it dipped in thinner or benzene from one day to another, and the glue will come off easily.

If you know some core easy to purchase in the market where you live, just send me datasheet with measurements in mm I can do a version of layout specific to the U.S. or Iceland ...

Regards
 
#50
ON THE JOB

Hi renatoscp
greetings i am trying to finish it quickly managed to make pcb driver stage 8.0SBX just one doubt base resistance shown is 68 ohms is it 6.8 ohms😀
WARM REGARDS
andrew
 

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#51
andrewlebon said:
Hi renatoscp
greetings i am trying to finish it quickly managed to make pcb driver stage 8.0SBX just one doubt base resistance shown is 68 ohms is it 6.8 ohms😀
WARM REGARDS
andrew
Click to expand...

Yes friend, the correct is 6.8 or 4.7 ohms which is even better. This error occurred because when I made the PCB, I used based on the initial regimen (before correction), and copied his values​​, see:

https://www.dropbox.com/s/9dox5y5ke1usubv/esquema inicial.pdf

I was correcting the layout, but for lack of time I ended up not doing it.

Follows the simulation file (multisim12):

https://www.dropbox.com/s/3uq8rilgc8s2hy1/Mod BX original.ms12

And here is a "supercharged" version with more power transistors (PCB do not have this):

https://www.dropbox.com/s/id9um3bdf5t2m6a/Mod BX12.ms12

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