Esp P3

[audioPT]

Hi!

This is a HOT subject!

I've made a ESP P3 amplifier for a small self powered speaker project.
Everything is ok, but the OPS transistors get very hot.
I say VERY HOT!!!
It's all correct and well assembled.
I can also fry some eggs 😀 in the heatsink.

Is this normal?
I also have some ESP P3A working, and they don't get hot (unless I push them to the limit).

Thanks

Pedro Martins

 

[NU_NRG]

Well, I'm sure you know that the size of the heatsink as well as the bias setting may influence the heat your o/p transistor have to endure.

Could you describe more this overheating amplifier?

 

[joensd]

Hi Pedro,
have you thought about that the amplifier probably oscillates at non audible frequencies?
you should attach an oscilloscope to see what the OPS-transistors really do.

 

[paulb]

ESP P3 and P3A are pretty similar. I agree, look for oscillation. Have you adjusted the bias current to the recommended value?