help with amp

kpero · 9th September 2005, 09:02 PM

Hello

I am building an amp. Here is shematic.
It's prety easy amp ,with distortion about 0.08 %. It is part of system which will amp my woofers. Preamp is already built and now it's time for amplifier.

Value of elements are default so don't look at.

kpero · 9th September 2005, 09:08 PM

And here is the shematic. This is my firs project so I want to know is this will work as i did it?

Thanks

boraomega · 9th September 2005, 09:48 PM

Yes it will, for that's the one of generic topologies used frequently and you will find hundreds of almost indentical schematics all over the WEB.

AndrewT · 10th September 2005, 08:20 AM

Hi Kpero,
Q4 & Q6 need current capacity to drive the output fets at high frequency. You may need to add a pair of drivers (fet or bjt) to ensure front end can work.

djk · 10th September 2005, 08:44 AM

Your board layout is for IRF type V-mos.

They will blow up with your bias circuit.

Hitachi type L-mos will work with your bias circuit, but they require the drain and source layout be swapped, they are harder to find, and are more expensive.

kpero · 10th September 2005, 12:47 PM

AndrewT wrote:
>You may need to add a pair of drivers (fet or bjt) to ensure front end >can work

Can you draw me

. I am not shure I understand what you have in mind.
I will repeat, I dont have much experiance in amp's. I am still learning?

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9th September 2005, 09:48 PM	#3
boraomega diyAudio Member Join Date: May 2005 Location: Cacak, Serbia	Yes it will, for that's the one of generic topologies used frequently and you will find hundreds of almost indentical schematics all over the WEB.

10th September 2005, 08:20 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi Kpero, Q4 & Q6 need current capacity to drive the output fets at high frequency. You may need to add a pair of drivers (fet or bjt) to ensure front end can work.

10th September 2005, 08:44 AM	#5
djk diyAudio Member Join Date: Feb 2001 Location: USA	Your board layout is for IRF type V-mos. They will blow up with your bias circuit. Hitachi type L-mos will work with your bias circuit, but they require the drain and source layout be swapped, they are harder to find, and are more expensive.

10th September 2005, 12:47 PM	#6
kpero diyAudio Member Join Date: Apr 2005 Location: Croatia	AndrewT wrote: >You may need to add a pair of drivers (fet or bjt) to ensure front end >can work Can you draw me . I am not shure I understand what you have in mind. I will repeat, I dont have much experiance in amp's. I am still learning?