MOSFET Amplifier IRFP240/IRFP9240 - Page 29

udhay_cit · 11th July 2010, 04:20 PM

Hi the HV350 amp working for me with single pair of MOSFET and +/-33V. It's only for testing. I am going to construct the full function amplifier

....

But the Toshiba transistors are not available in my nearest stores. for testing now i am using 2N5401&2N5551 instead of 2SA970&2SC2240. For other two complementary pairs i am using MJE340&MJE350 (sorry its only for testing). The amp works good but i want to match the perfect complementary pair for all the Toshiba transistors.

The transistor terminal changes not a problem, i will make the correction in my PCB design. My question is may i replace the 2SA970&2SC2240 pair with 2N5401&2N5551 permanently. What should be the equivalent transistors for other pairs and it should be easily available in market. Please give me a solution. Thank you.

Regards
Udhay

apexaudio · 11th July 2010, 05:46 PM

Quote:

Originally Posted by udhay_cit

Hi the HV350 amp working for me with single pair of MOSFET and +/-33V. It's only for testing. I am going to construct the full function amplifier

....

But the Toshiba transistors are not available in my nearest stores. for testing now i am using 2N5401&2N5551 instead of 2SA970&2SC2240. For other two complementary pairs i am using MJE340&MJE350 (sorry its only for testing). The amp works good but i want to match the perfect complementary pair for all the Toshiba transistors.

The transistor terminal changes not a problem, i will make the correction in my PCB design. My question is may i replace the 2SA970&2SC2240 pair with 2N5401&2N5551 permanently. What should be the equivalent transistors for other pairs and it should be easily available in market. Please give me a solution. Thank you.

Regards
Udhay

I try to use most available parts, and use design witch performance is independent of special parts. 2SA/2SC can be permanently replace with 2N, and you can replace other transistor, but try to maching hfe for simetry,
Regards

apexaudio · 11th July 2010, 09:08 PM

Can you post pictures, and what speakers you use?

apexaudio · 11th July 2010, 10:43 PM

Quote:

Originally Posted by mihailo

Thanks.
I need schematics because I don't know where to connect output,voltage,...
it's not marked on pcb.
Regards

This can help...

mihailo · 12th July 2010, 01:17 PM

Thank you so much Apex.
I'LL do PCB tomorrow, and post pictures.
Regards

Cambe · 12th July 2010, 02:05 PM

Hi,
I have a few questions about PSU-7.
What is it ? (features)
Where is the bottom side of the PCB, to make one.

Thanks,
Cambe

apexaudio · 12th July 2010, 03:15 PM

Quote:

Originally Posted by Cambe

Hi,
I have a few questions about PSU-7.
What is it ? (features)
Where is the bottom side of the PCB, to make one.

Thanks,
Cambe

Post #122
Regards

udhay_cit · 14th July 2010, 11:14 AM

Quote:

Originally Posted by apexaudio

Can you post pictures, and what speakers you use?

Sorry for the very low quality pictures....

I am using DAINTY WOOFER

12" - 8Ω / ~240W

najjachi · 14th July 2010, 01:30 PM

hi apex it's me agin. can you post new picture of PCB of HV350.2 for print because some points on the PCB are in brown color example the points of the output transistors.
Regards.

apexaudio · 02:30 PM

Quote:

Originally Posted by udhay_cit

Sorry for the very low quality pictures....

I am using DAINTY WOOFER

12" - 8Ω / ~240W

Look nice, but you must put driver transistors on heatsink with outputs, drivers work with 30mA bias and must be on heatsink. Better use some TO220 for drivers.
Regards

11th July 2010, 04:20 PM	#281
udhay_cit diyAudio Member Join Date: Feb 2008	Hi the HV350 amp working for me with single pair of MOSFET and +/-33V. It's only for testing. I am going to construct the full function amplifier.... But the Toshiba transistors are not available in my nearest stores. for testing now i am using 2N5401&2N5551 instead of 2SA970&2SC2240. For other two complementary pairs i am using MJE340&MJE350 (sorry its only for testing). The amp works good but i want to match the perfect complementary pair for all the Toshiba transistors. The transistor terminal changes not a problem, i will make the correction in my PCB design. My question is may i replace the 2SA970&2SC2240 pair with 2N5401&2N5551 permanently. What should be the equivalent transistors for other pairs and it should be easily available in market. Please give me a solution. Thank you. Regards Udhay

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

11th July 2010, 09:08 PM	#283
apexaudio diyAudio Member Join Date: Feb 2010 Location: Serbia	Can you post pictures, and what speakers you use?

12th July 2010, 01:17 PM	#285
mihailo diyAudio Member Join Date: May 2010 Location: Serbia	Thank you so much Apex. I'LL do PCB tomorrow, and post pictures. Regards

12th July 2010, 02:05 PM	#286
Cambe diyAudio Member Join Date: Aug 2001 Location: USA,NorthCarolina	Hi, I have a few questions about PSU-7. What is it ? (features) Where is the bottom side of the PCB, to make one. Thanks, Cambe

14th July 2010, 01:30 PM	#289
najjachi diyAudio Member Join Date: Jul 2010	hi apex it's me agin. can you post new picture of PCB of HV350.2 for print because some points on the PCB are in brown color example the points of the output transistors. Regards.