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:
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
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
hello friends!
this amp is very simple and efficient and left you guys surprised at the quality he can play, just ride and enjoy!
Hugs!
Naldo Santos.
this amp is very simple and efficient and left you guys surprised at the quality he can play, just ride and enjoy!
Hugs!
Naldo Santos.
Sorry for failure ... In the first post I added just basic PDFs and forgot me of complete files, but now follows:
https://www.dropbox.com/s/vxpq9cbiatbop6h/NS450_AMP.rar
Do not be fooled by the simplicity of this project ... Was simply one of the best amps I have ever ridden, has a great sound ...
The GND in output is only for the connection to the speaker could be performed with proper twin conductor, if you do not use this type of connector GND conductor this can simply be ignored.
Power Supply PCB?
Hello Sir Renato,
This is an interesting amp to make. Just want to ask if you have the complete files or the PCB layout for the Power Supply. I hope you can share that too.
Thanks,
Neil
Hello Sir Renato,
This is an interesting amp to make. Just want to ask if you have the complete files or the PCB layout for the Power Supply. I hope you can share that too.
Thanks,
Neil
Yes friend, follows:
https://www.dropbox.com/s/js89jiwf6u9o8ci/NS450_FONTE.rar
If you have questions regarding the transformer, then I put the details ok ...
Could you maybe post the schematic for the SMPS?
I'm thinking of building this for my bachelor project in EE.
I need to make my own PCB's for it.
Thanks.
I'm thinking of building this for my bachelor project in EE.
I need to make my own PCB's for it.
Thanks.
One more question, do i need a pre-amp if i am for example pluging an ipod into it?
Or do i have to build a pre-amp also?
Or do i have to build a pre-amp also?
The initial scheme was this:
An externally hosted image should be here but it was not working when we last tested it.
But the PCB some changes were made, such as the removal of the secondary 12V and also the implementation of the transistor / zener safety for the IR2153. The rest has not changed ...
hi friend🙂
renatoscp thank you for pcbs
but one question? the supply in a load sound have ripple or not?
friend i cann't speak english very well . sorry😀
renatoscp thank you for pcbs
but one question? the supply in a load sound have ripple or not?
friend i cann't speak english very well . sorry😀
Power Supply PCB
Thank you so much for the files Sir Renato.
I just want to confirm the following:
1. How many strands of AWG #26 for the primary winding?
2. Can I use 4 strands for the secondary? (to reduce the skin effect)
3. What is the maximum power output can this power supply provide?
4. The 100K trimmer: Is this for the frequency control?
5. How to adjust the trimmer for testing?
PRI: 2x20 turns #26 AWG magnet wires
SEC: 2x10 turns bifilar winding of 2 strands AWG #19 magnet wires
Regards,
Neil
Thank you so much for the files Sir Renato.
I just want to confirm the following:
1. How many strands of AWG #26 for the primary winding?
2. Can I use 4 strands for the secondary? (to reduce the skin effect)
3. What is the maximum power output can this power supply provide?
4. The 100K trimmer: Is this for the frequency control?
5. How to adjust the trimmer for testing?
PRI: 2x20 turns #26 AWG magnet wires
SEC: 2x10 turns bifilar winding of 2 strands AWG #19 magnet wires
Regards,
Neil
Hi Renatoscp,
I am also interested in the SMPS. Could you give some extra info to build the transformer and also the additional ferrite core at the input and the two inductors at the output (all 3 visible on the pcb). It looks like a very nice project! Thanks in advance.
Jacques
I am also interested in the SMPS. Could you give some extra info to build the transformer and also the additional ferrite core at the input and the two inductors at the output (all 3 visible on the pcb). It looks like a very nice project! Thanks in advance.
Jacques
LAST QUESTION RENATOSCP
What watt rating are the 0.47 Ohm resistors? It doesn't say on the schematic but on the PCB they are rather large.
What watt rating are the 0.47 Ohm resistors? It doesn't say on the schematic but on the PCB they are rather large.
hi friend🙂
renatoscp thank you for pcbs
but one question? the supply in a load sound have ripple or not?
friend i cann't speak english very well . sorry😀
Sorry friend, but did not quite understand your question ... My English is too bad, I'm Brazilian ...
Good afternoon friend!
1 - The primary is just a 26 or 24 AWG wire. Winds 20 turns, then wind the secondary and finally wrap the other 20 turns on the secondary.
2 - Yes, provided it fits in the chosen core.
3 - Around a 450W at 45V (10A)
4 - Yes, the trimpot is for adjusting frequency around 70kHz ok ...
5 - Do as I did in this video:
Ajuste de frequencia - Fonte chaveada IR2153 - YouTube
Any questions can send ...
Regards,
Renato
There is great care to construct the input filter, u can use ready models or just ignore them using 2 jumpers (not recommended) ... The output inductors can be built separately, using a pencil as a way u can make two coils wired 17AWG, wrap as many turns as needed to get from one island to the other on the plate, are not judicious and serve only to protect the capacitors since this source works with duty cycle in 50-50% ... And yes, it is an excellent source, small and powerful ...
The transformer I just pass right above some data on how rolling is easy too, but you can ask any questions.
Regards
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