150W MOSFET Amplifier with IRFP250x2

[Freecrowder]

So do any PCB's or gerbers exist to build the NX400

 

[kandimba]

Hi Feecrowder here you have Apex NX400 gerber file.

Regards

 

[Freecrowder]

I'm looking at having some boards made of the NX400. Are the gerbers above good to go w/o errors or changes. Also looking at using IRFP250s instead of 240s bc I have alot of them laying around. I'm assuming swapping the transistors won't be a problem??

 

[leonski66]

To Mr. Apex? THD is not a brickwall limit. You may get away with 5% or so at very low frequencies while 1% at high frequencies may be objectionable......depending perhaps on duration?
Not that it matters much, but many of the old-school Tube Amps, like the Dynaco ST-70 were maybe 1/2% or higher factory spec......
So while I'd generally agree.......I'm not prepared to make a brickwall statement.....

As for using an IR device? I worked for 'em for years in manufacturing and they were NEVER able to turn the corner on quality. I have one of their demo board / 'D' amps needing a power supply......Maybe a switcher that I can buy pre-packaged?

 

[rankot]

Hi M. Mile here they are, with UF4004

Have you tested this PCB for N20? Built amp? How does it sound?

What is PRO output on N20?

 

[rankot]

I actually want to use N20 as a bass amplifier. Can it be used for that? If not, could I modify it somehow so it can be used for such a purpose?

 

[Freecrowder]

So I received my NX400 boards the other day and am ready to get started. I'm assuming I can just use the components printed on the solder mask? I have seen different versions of the board in this thread. Mine is the version linked above. Are there any details on supply voltages and bias levels. I have very big heatsinks for an AB amp and would like to run the bias on the high side for AB on this version. Any thoughts?

 

[Joel Wesseling]

Any more progress here?
Seems like the place to find a Bass amplifier/Sub Amplifier. I'm looking for amplifier for Bass Guitar and subwoofers.

 

[Freecrowder]

Hey Joel you interested in building this amp? I have plenty of boards. Let me know

 

[Joel Wesseling]

Thanks the offer Freecrowder. DId you build the amp?
I'd like to find out how it worked out with someone first?
just knowing all is well with the design would be nice. I'm thinking about getting PCB from PCB house as gerbers are available.
I need 4 mono sub amps and one bass guitar amp

 

[Joel Wesseling]

I received these boards, gerbers from post 422 - different layout than other one on here..

Can someone post gerbers for NE555 protect if you have them? they might be somewhere in the main thread but its a lot to sift through! thanks

 

[ballisticz4]

Morning guys. NX400, can I use IRFP150 instead? Going to be using a 33-0-33 AC 500va transformer. I have plenty of IRFP150 in my parts bin. Please advise.

Thank you

 

[ballisticz4]

Also is this correct for printing

 

[ballisticz4]

Can someone pls advise Don't want to start this if the irfp150 won't work

 

[ballisticz4]

How to get to 5uH with the Apex NX400 3w v1.2

 

[ballisticz4]

Sorted thanx

 

[ballisticz4]

Started yesterday. Hopefully all goes well

 

[sagnikoni]

Yes

Hello Sir. Im getting DC output on NX-14. its almost same as Power voltage. No voltage across 0.1ohm in 0.1V range.
can you please give me any suggestion to debug this problem?
i have shorted SGND with PGND. But not connect any external 10K pot to the Signal Input.
Thanks.
Photo- https://www.diyaudio.com/community/threads/100w-ultimate-fidelity-amplifier.164093/post-7361980

 

[44250]

mje340 is in a right position?

 

[sagnikoni]

@44250 Yes.
Iam getting this voltage reading in the circuit.