150W MOSFET Amplifier with IRFP250x2

[ballisticz4]

Guys, the 6k8 2w resistor on the NX400, its at the bottom left of the board, what is the purpose of that. I see it goes to the 2 led's. I dont have that part, and it is the only part I still need to finish the amps. Can I replace with something else? A other value? Maybe 2k2 2w or maybe put 2 x 2k2 in series to give 4k8?

 

[jorgovanko]

Can you post circuit or link to it?

 

[Mark Tillotson]

Guys, the 6k8 2w resistor on the NX400, its at the bottom left of the board, what is the purpose of that. I see it goes to the 2 led's. I dont have that part, and it is the only part I still need to finish the amps. Can I replace with something else? A other value? Maybe 2k2 2w or maybe put 2 x 2k2 in series to give 4k8?

Current limiting resistor for the power LED I think. If so omitting it won't affect amp operation, fit it when you get it?

 

[ballisticz4]

Here is the amp, this is for the 5w version, but the resistor in question is exactly the same for the 3w version I'm building. See the blue circle bottom left. Can I replace with 2k2 or 2 x 2k2 in series or leave it out for the time being. Cant get to the spares place to buy 2 of this

 

[jorgovanko]

Series or parallel, calculate...

22K//22K//18K - all can be 0.6W...

Or 2k2 - 2k2 - 2k2

You cant go wrong here I guess

 

[ballisticz4]

just worried that there is a 2w there. Must be a reason for it

 

[jorgovanko]

3 (or 4) x 0.6W resistor should be fine.

 

[prasi]

IRFP250 MOSFET AMPLIFIER

IRFP250 amplifier in vogue

Hello Andrew,
Can you please post the pcb design and also schematic? I am interested in this for my diy subwoofer

 

[quadtech]

Hello Andrew,
Can you please post the pcb design and also schematic

Sadly he went silent key -

https://www.diyaudio.com/community/threads/andrew-lebon.400145/

 

[stewin]

https://www.diyaudio.com/community/threads/andrew-lebon.400145/post-7372670

this is tragic r.i.p to andrew lebon who participated in this topic . we will miss you andrew

 

[thimios]

Sadly Andrew isn' t with us😭

 

[stewin]

true

 

[audio25]

Yes

Mr. mile.
Apex nx 400
Irfp250 mosfet using any problem
Nx400 scematic (in diagram irfp250)
In my hand irfp250 available
Any problem
please help..

 

[audio25]

Mr. mile.
Apex nx 400
Irfp250 mosfet using any problem
Nx400 scematic (in diagram irfp250)
In my hand irfp250 available
Any problem
please help..

In scematic 5w resistor 0.47 ohm but any problem

 

[chermann]

IRFP250 MOSFET AMPLIFIER

IRFP250 amplifier in vogue

I am very sorry about Andrew... r.i.p.

at post 367 amp

Prasi is reference to. does somebody know about andrews amp?

 

[taghy]

Hello. Drum amplifier nx400 is a pro part, where is it connected?

 

[kandimba]

Hi, pro part schould connect to protection protect.

Regards

 

[kandimba]

As you can see in this Apex AX20

 

[taghy]

Hello and thank you. In some amplifiers, there is no pro output, where should we get the output for the protector? From the pre-amplifier or the output of the amplifier?

 

[taghy]

برHow is the protection for MOSFET amplifiers? Do you have a MOSFET amplifier protector? Does it have a short circuit and speaker protection?