US Amps AX-3200DE

[caraudioguy2100]

This amp is using IRFP264N as the outputs they are obsolete .

Anyone know of a good replacement?

 

[DanFS722]

Buy original transistors IRFP264N

Assuming you have seen this?

 

[caraudioguy2100]

I removed all of the power supply fets and outputs since they were blown .

I hooked up power ground and remote and the protection light is on .


Here is what I get on the 494

Pin 1:13.87
Pin 2:5.02
Pin 3:4.58
Pin 4:2.09
Pin 5:1.86
Pin 6:3.68
Pin 7:0.00
Pin 8:13.89
Pin 9:0.00
Pin 10:0.00
Pin 11:13.89
Pin 12:13.89
Pin 13:5.02
Pin 14:5.02
Pin 15:7.00
Pin 16:5.02


Any ideas what might cause this ?

 

[Lenin89]

This will help.

Basic Switching Power Supply Design Tutorial

As You can read pin 1 is higher than pin 2 which drives pin 3 high - which in its turn shut downs the power supply. Follow the EA where they are connected to and see what causes these voltages not to be OK.

 

[caraudioguy2100]

Ok got that figured out .

This amp uses A1266, as the drivers for the power supply .

The fets are IRF1010E with 47 ohm gate resistors .


Can I use the BD140 as the drivers ?

 

[Perry Babin]

Yes. I've never seen a power supply where the BD139 and/or BD140 would not work as drivers.