New amp design

jleaman · 9th September 2002, 12:53 AM

Well here it is i finaly got is and scanned it. it is my dads layout and design but here it is have a look any sujestions are welcome.. it is a fet design and produces about 75watts class ab

J'

The Saint · 9th September 2002, 01:57 AM

Hi Jason

I looks alot like IRF's application note ampifier schematic.

Regards

Anthony

jleaman · 9th September 2002, 01:58 AM

yes yes it is verry close but has been changed alittle.. new board layout and ect ect components have been changed. too..

jleaman · 9th September 2002, 04:24 AM

can any one sujest some input or upgrades..

J

The Saint · 9th September 2002, 04:31 AM

I would add 220 Ohm Gate resistors and 0.22 Ohm 5 watt Source resistors and replace the IRF100 devices for IRFP240's or something similiar.

Regards

Anthony

jleaman · 9th September 2002, 04:35 AM

well curently there are irf 540's in there you stuill sujest irfp240's i have a whole pile of them too.. from my n-channel amp..

HEHE

Hey anthony do you still have any n-channelboards instock..?

J'

The Saint · 9th September 2002, 04:38 AM

Yep, I still a few left in stock.

Anthony

jleaman · 9th September 2002, 04:40 AM

so i should use irfp240's in this sircuit..?

The Saint · 9th September 2002, 04:47 AM

You can if you wish , they should work fine...

Anthony

jleaman · 9th September 2002, 05:09 AM

will i have to change any parts in the schematic or just leave it and put the irfp240's in and re bias it..
do i change the input voltage or keep it at 42 volts and what do you think that my power out will be.. im not looking for lots but just ceriousse.

J

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9th September 2002, 01:57 AM	#2
The Saint diyAudio Member Join Date: Jul 2002 Location: Launceston, TAS, Australia	Hi Jason I looks alot like IRF's application note ampifier schematic. Regards Anthony

9th September 2002, 01:58 AM	#3
jleaman Banned Join Date: Apr 2002	yes yes it is verry close but has been changed alittle.. new board layout and ect ect components have been changed. too..

9th September 2002, 04:24 AM	#4
jleaman Banned Join Date: Apr 2002	can any one sujest some input or upgrades.. J

9th September 2002, 04:31 AM	#5
The Saint diyAudio Member Join Date: Jul 2002 Location: Launceston, TAS, Australia	I would add 220 Ohm Gate resistors and 0.22 Ohm 5 watt Source resistors and replace the IRF100 devices for IRFP240's or something similiar. Regards Anthony

9th September 2002, 04:35 AM	#6
jleaman Banned Join Date: Apr 2002	well curently there are irf 540's in there you stuill sujest irfp240's i have a whole pile of them too.. from my n-channel amp.. HEHE Hey anthony do you still have any n-channelboards instock..? J'

9th September 2002, 04:38 AM	#7
The Saint diyAudio Member Join Date: Jul 2002 Location: Launceston, TAS, Australia	Yep, I still a few left in stock. Anthony

9th September 2002, 04:40 AM	#8
jleaman Banned Join Date: Apr 2002	so i should use irfp240's in this sircuit..?

9th September 2002, 04:47 AM	#9
The Saint diyAudio Member Join Date: Jul 2002 Location: Launceston, TAS, Australia	You can if you wish , they should work fine... Anthony

9th September 2002, 05:09 AM	#10
jleaman Banned Join Date: Apr 2002	will i have to change any parts in the schematic or just leave it and put the irfp240's in and re bias it.. do i change the input voltage or keep it at 42 volts and what do you think that my power out will be.. im not looking for lots but just ceriousse. J