Building mini-A (BrianGT boards), IRFP240 backordered, can I use IRFP140?

wct · 22nd January 2010, 03:54 PM

I’m stateside, and have an order ready to go at Digi-Key and Mouser for mini-A, DCB1 and a pair of LM3886 chipamps.

I’m building the mini-A using Brian’s boards. For now, it’s the low power version with 15 volt rails as opposed to the Aleph 30.

But the IRFP240 that is called out on Brian’s BOM is out of stock at both Digi-Key and Mouser.

I need 4 for the mini-A and another 4 for the DCB1(I’m building two of these).

I noticed on the DCB1 BOM, you can substitute IRFP140’s for the 240’s

Can I do that for the mini-A?

Is that substitution in the mini-A a compromise soundwise?

IF so, I will just wait the few months for the IRFP240’s.

I also noted that at Digi-key, there are IRFP140 (International Rectifier) and IRFP140BP (Vishay), with the Vishay’s being twice as expensive as the IR”s.

Top level specs don’t seem different in any way. But there must be a difference, one that might affect which one I buy if I do the substitution for the mini-A?

Thanks for the help, greatly appreciated.

Curt

Beftus · 22nd January 2010, 05:17 PM

The Mini-A
New Aleph Mini Parts GB

Good luck!

jleaman · 22nd January 2010, 06:07 PM

If you are building the MIni Aleph, you only need 4 IRFp240's they don't have to be matched either.

Picasa Web Albums - Jase - Mini - A

I think i might have 4, i could look if you want.

J'

Nelson Pass · 22nd January 2010, 07:12 PM

140's, no problem. Just don't parallel them with 240's

wct · 22nd January 2010, 08:53 PM

Thanks very much everyone for the help on this. Looking at Digi-Key once again quickly I see that

IRFP140NPBF made by International Rectifier are $1.84.

IRFP140PBF made by Vishay/Siliconix are $4.47.

Is there something I should know about the International Rectifier version

?

Reason why I ask is that I will eventually build the Aleph 30 version which use a fair number more output devices.
If the lower priced ones from IR are are perfectly fine then thats quite a savings.

And yeah, J’, if its really no trouble, could you take a look and see if you have 4 IRFP240's and what you would like for them including shipping to California?
Oh and I have never seen that version of the mini-A circuit board. But then again, I have not been around here very long.
The boards I have from Brian (chipamp.com) are black with gold vias.

Regards

Curt

jleaman · 22nd January 2010, 08:56 PM

Those are the SMD version only a few boards were mad, and i had most dibs on them

Id be happy to send you the IRF's no problem, ill look this afternoon.

When i bought all my parts i bought all dale resistors and all the higher end cap's. I have 4 of them running at 18-19V rails cant remember exactly.

I will be changing my psu soon to the new black psu boards and a crc psu, as it sounded better than just 2 caps and diodes.

CRC is worth every penny, and i love the mini alephs lots of power clean sound and easy to build.

J'

jleaman · 22nd January 2010, 09:00 PM

Quote:

Originally Posted by wct

The boards I have from Brian (chipamp.com) are black with gold vias.

Regards

Curt

Are your mini aleph boards black with gold ? I should order a set just because

This made me all happy when i got them, it was a surprise as Brian didn't tell me he was writing this on the boards.

I was actually at his house when we were designing them.

wct · 22nd January 2010, 09:31 PM

J'

Yup., black and gold, real beauties.

But I cant seem to come up with a picture of them at the moment.

On sale now till end of January at Brian's site.

BTW, I really like SMD, actually prefer to build that way when the low power levels will let you get away with it.

So yeah, those are nice SMD boards you have pictured there.

Curt

jleaman · 22nd January 2010, 11:02 PM

Quote:

Originally Posted by wct

J'

Yup., black and gold, real beauties.

But I cant seem to come up with a picture of them at the moment.

On sale now till end of January at Brian's site.

BTW, I really like SMD, actually prefer to build that way when the low power levels will let you get away with it.

So yeah, those are nice SMD boards you have pictured there.

Curt

Yes i have 4 brand new IRFP250's for you

Send me a pm, and i'll mail them next week

Jase

wct · 23rd January 2010, 12:10 AM

Jase

Very kind of you to help out.

Sending PM soon.

Best regards

Curt

22nd January 2010, 03:54 PM	#1
wct diyAudio Member Join Date: Jun 2006	Building mini-A (BrianGT boards), IRFP240 backordered, can I use IRFP140? I’m stateside, and have an order ready to go at Digi-Key and Mouser for mini-A, DCB1 and a pair of LM3886 chipamps. I’m building the mini-A using Brian’s boards. For now, it’s the low power version with 15 volt rails as opposed to the Aleph 30. But the IRFP240 that is called out on Brian’s BOM is out of stock at both Digi-Key and Mouser. I need 4 for the mini-A and another 4 for the DCB1(I’m building two of these). I noticed on the DCB1 BOM, you can substitute IRFP140’s for the 240’s Can I do that for the mini-A? Is that substitution in the mini-A a compromise soundwise? IF so, I will just wait the few months for the IRFP240’s. I also noted that at Digi-key, there are IRFP140 (International Rectifier) and IRFP140BP (Vishay), with the Vishay’s being twice as expensive as the IR”s. Top level specs don’t seem different in any way. But there must be a difference, one that might affect which one I buy if I do the substitution for the mini-A? Thanks for the help, greatly appreciated. Curt

22nd January 2010, 08:53 PM	#5
wct diyAudio Member Join Date: Jun 2006	Thanks very much everyone for the help on this. Looking at Digi-Key once again quickly I see that IRFP140NPBF made by International Rectifier are $1.84. IRFP140PBF made by Vishay/Siliconix are $4.47. Is there something I should know about the International Rectifier version? Reason why I ask is that I will eventually build the Aleph 30 version which use a fair number more output devices. If the lower priced ones from IR are are perfectly fine then thats quite a savings. And yeah, J’, if its really no trouble, could you take a look and see if you have 4 IRFP240's and what you would like for them including shipping to California? Oh and I have never seen that version of the mini-A circuit board. But then again, I have not been around here very long. The boards I have from Brian (chipamp.com) are black with gold vias. Regards Curt

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
L/R Boards and Matched IRFP240 Boards for Aleph/ A-X	lgreen	Swap Meet	7	25th August 2009 04:56 AM
BrianGT MIni A pcb - schematic ?	Zen Mod	Pass Labs	2	19th January 2008 02:25 AM
transformer with 3886 (BrianGT Boards)	mantisory	Chip Amps	2	3rd May 2005 02:59 PM
BrianGT rev B boards -- What to do now?	AAXenoStrange	Chip Amps	1	20th December 2004 01:38 AM
I ordered some boards from BrianGT and had a question.	punchpeanut	Chip Amps	4	23rd June 2004 04:47 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

22nd January 2010, 05:17 PM	#2
Beftus diyAudio Member Join Date: Nov 2008 Location: Netherlands	The Mini-A New Aleph Mini Parts GB Good luck!

22nd January 2010, 06:07 PM	#3
jleaman Banned Join Date: Apr 2002	If you are building the MIni Aleph, you only need 4 IRFp240's they don't have to be matched either. Picasa Web Albums - Jase - Mini - A I think i might have 4, i could look if you want. J'

22nd January 2010, 07:12 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	140's, no problem. Just don't parallel them with 240's

22nd January 2010, 08:56 PM	#6
jleaman Banned Join Date: Apr 2002	Those are the SMD version only a few boards were mad, and i had most dibs on them Id be happy to send you the IRF's no problem, ill look this afternoon. When i bought all my parts i bought all dale resistors and all the higher end cap's. I have 4 of them running at 18-19V rails cant remember exactly. I will be changing my psu soon to the new black psu boards and a crc psu, as it sounded better than just 2 caps and diodes. CRC is worth every penny, and i love the mini alephs lots of power clean sound and easy to build. J'

22nd January 2010, 09:31 PM	#8
wct diyAudio Member Join Date: Jun 2006	J' Yup., black and gold, real beauties. But I cant seem to come up with a picture of them at the moment. On sale now till end of January at Brian's site. BTW, I really like SMD, actually prefer to build that way when the low power levels will let you get away with it. So yeah, those are nice SMD boards you have pictured there. Curt

23rd January 2010, 12:10 AM	#10
wct diyAudio Member Join Date: Jun 2006	Jase Very kind of you to help out. Sending PM soon. Best regards Curt