150W MOSFET Amplifier with IRFP250x2

[kandimba]

As you can see in this Apex AX20

Hi normaly, at least you have two protections, one for shorts and the other is to protect loudspeakers from DC. For shorts you can see Apex AX20 detection pro. This is in amplifire section always and the power resistor R24 act like detection.

 

[taghy]

Thank you for your advice. I have built the NX400 amplifier and it works well. Which shield should I connect the PRO to?

 

[kandimba]

Ok here you have.

 

[taghy]

Hello. I made this amplifier protector and it works. My question is, can I connect this protector to nx400? Does it work for MOSFET or is it for bjt?

 

[taghy]

I made this protector, but it didn't work. I don't know if it's the assembly problem or the circuit itself.

 

[taghy]

I have also made this one and it works, but I don't think it has a short circuit protection.

 

[kandimba]

This protection is only DC protection and you can use it in any amplifier

 

[kandimba]

Ok here you have.

This Apex protection is DC protection, short protection and temperature protection.

 

[taghy]

Hello and thank you. The first protector I put was made with upc1237 and I think it also has a short circuit protector.

 

[taghy]

Hello. I built two nx400 amplifiers yesterday. Unfortunately, there are dc voltages in the output, what is the reason?

 

[kandimba]

How many volts do you have

 

[kandimba]

Do not forget the signal ground conection

 

[taghy]

Hello. 13 volts in one of the amplifiers and 42 volts in the other.Does the amplifier protector I made with upc1237 not have short circuit protection?

 

[kandimba]

Can you put photos, I think that you did some mistakes.

 

[taghy]

Pictures of both nx400 amplifiers

 

[kandimba]

Do not forget the signal ground conection

Nice work, did you conected the signal ground to the main ground, if you did so you should have to see your work again.

 

[taghy]

Hello. To power the pre-amp-fan-mp3 player-protection and other things, should they be powered separately?