hafler 9505 circuit here!

lt cdr data · 10th June 2006, 03:45 PM

feast your eyes!!

someone tell me how to get this a good size to view please? thanks

Netlist · 10th June 2006, 04:42 PM

You've got mail.

/Hugo

Zen Mod · 10th June 2006, 09:59 PM

Quote:

Originally posted by Netlist
You've got mail.

/Hugo

me too,me too!

( chokyATneobee.net )

djk · 11th June 2006, 09:15 AM

The 915 has the same second voltage amp, bias, and output stage.

http://k-amps.8m.com/cgi-bin/i/Power...afler_915c.jpg

Netlist · 11th June 2006, 10:11 AM

Your link leads to another page than you might have intended.
At least here.

/Hugo

lt cdr data · 11th June 2006, 11:02 AM

yes correct, the 1st stage is slightly different in that it has a cascode as well, and the fet current source is now bipolar, also the 9505 has a full current mirror.

But that's about it, they seem pretty idential after the 1st stage!!

Anyone know what the function of the 22pf cap. is from the output stage gate to the psu? someone said its not stability comp. but noise?

any guesses?

djk · 11th June 2006, 11:26 AM

The grounded output stage may be more susceptible to power supply noise coupling from the primary of the transformer than the usual method. This cap (and the 47pF on the other half) may play a role there, but it looks mainly for stability to me.

Don't know why the photo is not viewable for all. If your security is high it may not like the cookies and pop-ups. You could try going to the main site:

http://k-amps.8m.com

and then adding this to the address and then hit enter:

/cgi-bin/i/PowerAmps/Semicond/hafler_915c.jpg

lumanauw · 11th June 2006, 03:22 PM

Hi, LT CDR DATA

Your schematic in post#1 is so small, I couldn't see anything

But if I'm not mistaken (looking at it

), it is actually the first stage that makes it different than Hafler 915. It is not the differential itself that drives the second stage, but actually the drop of the diodes+cascodes that drives the second stage.
Look at patent #5,673,000

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
Help with Hafler 9505	AR2	Solid State	32	11th June 2010 02:56 PM
Hafler 9505 turn off thump	AJ	Solid State	7	3rd March 2008 04:30 PM
anyone got a hafler 9505 schematic?	lt cdr data	Solid State	20	29th March 2007 04:21 PM
Hafler XL-280 : PC-40D circuit design	keith721	Solid State	9	27th November 2006 06:54 PM
FS: Hafler DH-200 Circuit Cards	Dick West	Swap Meet	1	18th March 2005 06:09 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

10th June 2006, 04:42 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	You've got mail. /Hugo

11th June 2006, 09:15 AM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	The 915 has the same second voltage amp, bias, and output stage. http://k-amps.8m.com/cgi-bin/i/Power...afler_915c.jpg

11th June 2006, 10:11 AM	#5
Netlist diyAudio Moderator Join Date: Jan 2003	Your link leads to another page than you might have intended. At least here. /Hugo

11th June 2006, 11:02 AM	#6
lt cdr data diyAudio Member Join Date: Dec 2003 Location: earth	yes correct, the 1st stage is slightly different in that it has a cascode as well, and the fet current source is now bipolar, also the 9505 has a full current mirror. But that's about it, they seem pretty idential after the 1st stage!! Anyone know what the function of the 22pf cap. is from the output stage gate to the psu? someone said its not stability comp. but noise? any guesses?

11th June 2006, 11:26 AM	#7
djk diyAudio Member Join Date: Feb 2001 Location: USA	The grounded output stage may be more susceptible to power supply noise coupling from the primary of the transformer than the usual method. This cap (and the 47pF on the other half) may play a role there, but it looks mainly for stability to me. Don't know why the photo is not viewable for all. If your security is high it may not like the cookies and pop-ups. You could try going to the main site: http://k-amps.8m.com and then adding this to the address and then hit enter: /cgi-bin/i/PowerAmps/Semicond/hafler_915c.jpg

11th June 2006, 03:22 PM	#8
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Hi, LT CDR DATA Your schematic in post#1 is so small, I couldn't see anything But if I'm not mistaken (looking at it ), it is actually the first stage that makes it different than Hafler 915. It is not the differential itself that drives the second stage, but actually the drop of the diodes+cascodes that drives the second stage. Look at patent #5,673,000

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)