MOSFET Amplifier IRFP240/IRFP9240 - Page 44

yhoasakura · 09:25 AM

what is this the pro on the schematisc?

HighTec · 21st August 2011, 11:09 AM

Quote:

Originally Posted by yhoasakura

what is this the pro on the schematisc?

Well, Pro is short term of Protection. It's an over-current detector and in case of short circuit on the output, it sends the error signal to the protection board.

yhoasakura · 21st August 2011, 11:38 AM

thank you very much HighTec

Bushulo · 23rd August 2011, 07:25 AM

My email id bushulo@gmail.com if someone could kindly send me the gerber files or pdf of HV350.2 PCB layout.

Thank

masood · 24th September 2011, 01:08 PM

dear bushulo,
do you have obtain gerber files or pdf of hv350.2 pcb.i live in lucknow by this locotion i came to know that you belong to goa .i recently make a tour for goa,staid at hotel goa international in panji at meer mar beach.by the way it is very pleasant city i am too impressed with this city.my English is poor plz not mention.thanking you.my e mail is alvi.masood251@gmail.com

victordsouza · 24th September 2011, 05:03 PM

Hello Mile,
Could you explain working of circuit in post 383 so we can adapt it to other amplifiers? How is the overload/short circuit detected? What current?

Regards,
Victor

xsmid4 · 29th September 2011, 12:41 PM

hello, is it safe to use 2x63V for 3 pairs of IRFP240/9240? This should give about 250W to 4 ohms. There is no problem at 1khz and 10khz, but when we go close to limitation at 100hz in 4 ohms, then all IRFP240 burn. Maybe these transistors are fake?

AndrewT · 29th September 2011, 12:56 PM

3pr of 240/9240 adds up to ~900W of output devices.
Divide by 4 for MosFETs and you get ~225.

Your target of 240W into 4r0 is close enough to 225 to be considered as reliable.

However, your target of 240W and +-63Vdc do not seem compatible !

xsmid4 · 29th September 2011, 01:12 PM

output stage is powered with 2x63V and input stage with 2x70V

AndrewT · 29th September 2011, 01:37 PM

I get 300W to 320W from +-58.5Vdc supply rail using BJT output stages.
A mosFET output stage may require upto 5V more on the supply rails to achieve that 300 to 320 target.

But you are showing a target of "only" 240W from supply rails that are 4.5V higher. That seems odd.

21st August 2011, 09:17 AM	#431
yhoasakura diyAudio Member Join Date: Apr 2011 Location: roma	what is this the pro on the schematisc? Last edited by yhoasakura; 21st August 2011 at 09:25 AM.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
IRFP240&IRFP9240 power amplifier schematic	mos	Solid State	31	26th June 2012 08:21 AM
IRFP240 / IRFP9240 MOSFETs	danieljw	Swap Meet	8	4th July 2009 01:51 AM
Wtb: Irfp240 / Irfp9240	folkeb	Swap Meet	1	10th March 2009 10:18 AM
IRFP240 + IRFP9240 -- pairs	jackinnj	Swap Meet	1	2nd June 2006 02:22 AM
IRFP240 and IRFP9240 Wanted	richeros	Swap Meet	1	9th November 2002 12:38 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

21st August 2011, 11:38 AM	#433
yhoasakura diyAudio Member Join Date: Apr 2011 Location: roma	thank you very much HighTec

23rd August 2011, 07:25 AM	#434
Bushulo diyAudio Member Join Date: Aug 2006 Location: Goa	My email id bushulo@gmail.com if someone could kindly send me the gerber files or pdf of HV350.2 PCB layout. Thank

24th September 2011, 01:08 PM	#435
masood diyAudio Member Join Date: Dec 2010 Location: fatehpur	dear bushulo, do you have obtain gerber files or pdf of hv350.2 pcb.i live in lucknow by this locotion i came to know that you belong to goa .i recently make a tour for goa,staid at hotel goa international in panji at meer mar beach.by the way it is very pleasant city i am too impressed with this city.my English is poor plz not mention.thanking you.my e mail is alvi.masood251@gmail.com

24th September 2011, 05:03 PM	#436
victordsouza diyAudio Member Join Date: Sep 2003 Location: dubai	Hello Mile, Could you explain working of circuit in post 383 so we can adapt it to other amplifiers? How is the overload/short circuit detected? What current? Regards, Victor

29th September 2011, 12:41 PM	#437
xsmid4 diyAudio Member Join Date: Mar 2006 Location: Brno	hello, is it safe to use 2x63V for 3 pairs of IRFP240/9240? This should give about 250W to 4 ohms. There is no problem at 1khz and 10khz, but when we go close to limitation at 100hz in 4 ohms, then all IRFP240 burn. Maybe these transistors are fake?

29th September 2011, 12:56 PM	#438
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	3pr of 240/9240 adds up to ~900W of output devices. Divide by 4 for MosFETs and you get ~225. Your target of 240W into 4r0 is close enough to 225 to be considered as reliable. However, your target of 240W and +-63Vdc do not seem compatible !

29th September 2011, 01:12 PM	#439
xsmid4 diyAudio Member Join Date: Mar 2006 Location: Brno	output stage is powered with 2x63V and input stage with 2x70V

29th September 2011, 01:37 PM	#440
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I get 300W to 320W from +-58.5Vdc supply rail using BJT output stages. A mosFET output stage may require upto 5V more on the supply rails to achieve that 300 to 320 target. But you are showing a target of "only" 240W from supply rails that are 4.5V higher. That seems odd.