how choose a transistor to have a better sound

[Perry Babin]

If the feedback was taken from the speaker terminal side of the resistor, the damping factor wouldn't change. If the feedback was taken from the transistor side of the resistor (same as inserting the resistor between the speaker terminals and the speaker), then it would make a difference.

 

[Ground Zero]

Have you reinstalled the other two capacitors?

Hello

No i just change BUZ103AL with IRFZ46N and the problem apear after that just when i touch the resistor surrounded in red on the photo

i'll put the other two caps

 

[Perry Babin]

The BUZ103AL probably isn't a good substitute for the Z46.

 

[Ground Zero]

Thanks perry

sorry my english is not good

if i undersand the irfz46n is not good ?

Thanks

 

[Perry Babin]

Were the originals the BUZ103AL or the Z46s? I've never seen a car amp with logic level FETs in the power supply.

 

[Ground Zero]

the buz103Al are the original

 

[Perry Babin]

Try replacing the caps and post the results in the original thread you started for this power supply.

 

[Ground Zero]

thanks perry i'll do that