Aleph-X builder's thread. - Page 113

tenderland · 30th September 2006, 02:25 PM

I am ready to purchase some IrfP044 Mosfets for the Aleph-x (low power ver). It seems there is a choice btween No N and N type with what seems to me to be a trade off between less capacitance with the N type but more thermal resistance. My feeling is as long as the device is heatsinked proprely It would be more advantages to take less capacitance. Any thoughts ?

J

Zen Mod · 30th September 2006, 04:38 PM

Quote:

Originally posted by tenderland
My feeling is as long as the device is heatsinked proprely It would be more advantages to take less capacitance.

J

yes

Nixie · 1st October 2006, 01:13 PM

I thought the 240 were better...

Oggy · 3rd October 2006, 08:25 PM

Just testing if i have auto login on.

Zen Mod · 29th October 2006, 09:15 PM

Quote:

Originally posted by Oggy
Just testing if i have auto login on.

I can't see your post

Nixie · 4th November 2006, 11:52 AM

I wonder how to add a low-pass filter at the amp input (and output) so that HF noise doesn't get in (I'm in an interference-rich environment).

Netlist · 4th November 2006, 05:47 PM

Do you hear HF noise? If so, how would you know its environmental?

/Hugo

Nixie · 5th November 2006, 02:06 AM

It's there because an RF probe and a scope shows it.
I don't have to hear it directly to have concern about potential slewing distortion it can cause.

metalman · 6th November 2006, 01:54 AM

Nixie,

The Aleph-X design already has compensation caps on the feedback that create a low pass filter a little above 20kHz. That and the balanced operation more or less make HF noise a non-issue for these amps. I live at the bottom of Seymour Mountain where RF intensity is very high, and my Aleph-X's have no problems whatsoever with it.

Also, the 044 version is preferred for ower powered version as they don't eat up as much of the rail voltage compared to the 240's or 244's. The 044's sound ever so slightly darker, but still ever so resolved.

Cheers, Terry

hifimaker · 20th November 2006, 03:09 PM

Quote:

Originally posted by metalman
Nixie,

The Aleph-X design already has compensation caps on the feedback that create a low pass filter a little above 20kHz. That and the balanced operation more or less make HF noise a non-issue for these amps. I live at the bottom of Seymour Mountain where RF intensity is very high, and my Aleph-X's have no problems whatsoever with it.

Also, the 044 version is preferred for ower powered version as they don't eat up as much of the rail voltage compared to the 240's or 244's. The 044's sound ever so slightly darker, but still ever so resolved.

Cheers, Terry

Has anyone used IRF 144's? I used them in my Aleph30 with great success. Just wondering if anyone has experience using 144's with the HiFiZen boards from the GB a couple of years ago. How would the sound differ from the 044's or 240/244's for an under 40watt AlephX amp?

Thanks!

-David

30th September 2006, 02:25 PM	#1121
tenderland diyAudio Member Join Date: Jul 2004 Location: us	irf to n or not to n I am ready to purchase some IrfP044 Mosfets for the Aleph-x (low power ver). It seems there is a choice btween No N and N type with what seems to me to be a trade off between less capacitance with the N type but more thermal resistance. My feeling is as long as the device is heatsinked proprely It would be more advantages to take less capacitance. Any thoughts ? J __________________ "If every one is making wheels , why make wheels ? " Steve Jobs

3rd October 2006, 08:25 PM	#1124
Oggy diyAudio Member Join Date: Apr 2006 Location: Nr. Sundby	Test Just testing if i have auto login on.

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

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

1st October 2006, 01:13 PM	#1123
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	I thought the 240 were better...

4th November 2006, 11:52 AM	#1126
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	I wonder how to add a low-pass filter at the amp input (and output) so that HF noise doesn't get in (I'm in an interference-rich environment).

4th November 2006, 05:47 PM	#1127
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Do you hear HF noise? If so, how would you know its environmental? /Hugo

5th November 2006, 02:06 AM	#1128
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	It's there because an RF probe and a scope shows it. I don't have to hear it directly to have concern about potential slewing distortion it can cause.

6th November 2006, 01:54 AM	#1129
metalman diyAudio Member Join Date: Jun 2003 Location: Calgary, Alberta	Nixie, The Aleph-X design already has compensation caps on the feedback that create a low pass filter a little above 20kHz. That and the balanced operation more or less make HF noise a non-issue for these amps. I live at the bottom of Seymour Mountain where RF intensity is very high, and my Aleph-X's have no problems whatsoever with it. Also, the 044 version is preferred for ower powered version as they don't eat up as much of the rail voltage compared to the 240's or 244's. The 044's sound ever so slightly darker, but still ever so resolved. Cheers, Terry