NAP-140 Clone Amp Kit on eBay

[Oleg Turbin]

in addition to Oleg who makes excellent PCBs, there was also a guy who made great boards, he passed by here but I don't remember his name, it's something like "kawoei" or a stuff like that.
I have one of these pcbs somewhere to rebuild my nait5.
@Oleg Turbin, does that mean anything to you?

I have the original board from Nait5i-2

Also i have DIY boards Nait2 and Nait3

You have the Nait5 or Nait5i ?

Also have the DIY boards for NAP140 olive

All diy boards make in fabric from original design

 

[Oleg Turbin]

Nait5i-2

 

[huggygood]

I have the original board from Nait5i-2

Also i have DIY boards Nait2 and Nait3

You have the Nait5 or Nait5i ?

Also have the DIY boards for NAP140 olive

All diy boards make in fabric from original design

It's not a Nait5 but a Nait3,my memory is failing me.

 

[Oleg Turbin]

That ?

 

[sworder84]

Without a link or picture is difficult something to say...

Бесплатная доставка, усилитель NAIM NAP140, двухканальный PCB | AliExpress
and
2 канала, NAP140 2SC2922, усилитель мощности на NAIM 140 80WX2 8R, готовая плата | AliExpress
I was heard that blue is better.

Good Day

Hi, there! Do you have better option than ali? Gerber?

 

[Oleg Turbin]

У меня есть платы NAP140 без деталей
Если Вам нужен комплект с деталями у меня его на продажу нет.
Оригинальные детали дороги и в данный момент их трудно достать.

 

[huggygood]

 

[Oleg Turbin]

Good day
Dear Huggygood
What’s happened with your Nait3 ?

 

[mdardeniz]

NAP140 clone, series 15R // inductor was added. Mostly it was 10R, in NAD C352 it is 1R. Why 15 ohm is choiced for nap140?

 

[mdardeniz]

Naim Nap's can work for min 4 ohms (or 2 ohms) speakers. So, min resistance may be 4ohms (2 ohms) // inductor? ok? (I assume that, power transistor can handle HF output for 4 ohms).

 

[mdardeniz]

NAP140 clone, series 15R // inductor was added. Mostly it was 10R, in NAD C352 it is 1R. Why 15 ohm is choiced for nap140?

Is there anybody to answer my question? is it really 15 ohm resistor better than 10 ohm (or 1 ohm) resistors? LTspice shows in square wave, 3, 4 ohm is enough for 8ohm speaker empedance.

 

[Kleinhorn]

Hello,
Interesting question, i am interested too....i found much different plans/schematics in the I-Net . On the most Nap 140 schematics the 10 or 15 Ohm resistor is missing, the coil/inductor too. Instead there is a 0,22 Ohm resistor in the output, as in the Nap 180 clone too. Only the schematics of the Nap 250 has the 15 ohm resistor with 1 µh inductor ? I think its very similar to an 0,22 Ohm resistor. Chinese informations about their boards are not helpful. No idea what i have built....a little bit of everything...Nap 250? I have to test it....

Greetings
Peter

 

[Oleg Turbin]

old Nap250 use the 12R zobel
Old Nap140 use the 8.2R zobel
Black nap200 use the 12R zobel

 

[Oleg Turbin]

NAP140 clone, series 15R // inductor was added. Mostly it was 10R, in NAD C352 it is 1R. Why 15 ohm is choiced for nap140?

Do not buy the china clone
It’s a lost money 🙂

 

[Kleinhorn]

Hello Oleg,
do you know about the differences at the output ? In some case i can find a boucherot network with 1 µH inductor and 15 Ohm resistor, in an other case exspecially on china clones an 0,22 ohm resistor after the zobel network. Is it perhaps only a mod ? In my oppinion the boucherot network is the better way for critical impedances.

Thanks
Peter

 

[Oleg Turbin]

For old nap140 zobel circuit is 8.2R

Naim is not use the inductor for output

U need buy the original Naim naca5 speaker cable

 

[Kleinhorn]

U need buy the original Naim naca5 speaker cable

Öh....if the Naim Nap dos not work with this special cabel....trash can. Thats not mine...😎

 

[gaborbela]

U can use the inductor on the output paralleled with 10R 3W resistor and use any speaker cable you like or prefer.
You do not need to mount the mentioned items on your PCB, it is fine if you mounted on the speakers terminal.

 

[Kleinhorn]

I am knowing about puttig the Network to the binding post. At first i try out the board, funktion and sound. If i find something i do not like the amp board will never see a case. No smoke and a good sound.... i can make a new pcb very fast.... 🙂

Regards
Peter

 

[mdardeniz]

U can use the inductor on the output paralleled with 10R 3W resistor and use any speaker cable you like or prefer.
You do not need to mount the mentioned items on your PCB, it is fine if you mounted on the speakers terminal.

thats all true. If you want to use any cable, you have to use that LR filter. thats for capacitance load due to cable or speaker. It's normal value of this resistor is 10ohms. Some amplificators can use down to 1 ohm. I want to know that how decided to use that unusual 15ohm value. Is this experimental result? if so what is the capacitance of the load( >2uf)?