New Lin 3 stage design anyone?

bmcevers · 28th August 2003, 03:54 AM

Attached is a .doc which contains a .jpeg of a new amp design I've been working on. As of right now all I have is simulation, no test prototype. I was hoping some of the more knowledgeable engineers out there could check it out and help me optimize some values. Please no criticism based on subjectivism, this won't help. The amp topology is based on the Lin 3 stage with an EF type 2 output stage. The input is bootstrapped to lower the impedence of the NFB Network (lower noise). The input differential transistors are paralleled for the same reason. The VAS is a standard darlington with active load current source and buffers.
The output stage is EF type 2 utilizing a switchoff cap. As I said, any good engineering insight would be appreciated.

Thank-You,

bmcevers · 28th August 2003, 03:58 AM

zipped circuitmaker file

bmcevers · 28th August 2003, 04:03 AM

maybe...... the great... John Curl
......or the..... almighty .....Nelson Pass

Maybe I'm asking too much...

Nice to dream though!!

bmcevers · 28th August 2003, 05:22 AM

Yes, I know there is no Zobel on the output stage, I left it out for space reasons.

john curl · 28th August 2003, 05:28 AM

I can't open zips without a lot of trouble. Sorry.

bmcevers · 28th August 2003, 05:52 AM

.gif

(hint, hint Mr. Curl)

bmcevers · 28th August 2003, 05:58 AM

I can't get the file size small enough so that I can directly post it.
I guess I am out of luck.

bmcevers · 28th August 2003, 06:02 AM

.jpeg

bmcevers · 28th August 2003, 06:03 AM

Finally!

sajti · 28th August 2003, 06:08 AM

It looks nice. My only problem is that the emitter resistors for the output stage, are too low. There will be hard to fix the bias current with this value. I use 0.22ohms at least.

Sajti

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28th August 2003, 04:03 AM	#3
bmcevers diyAudio Member Join Date: Aug 2003 Location: SoCal	maybe...... the great... John Curl ......or the..... almighty .....Nelson Pass Maybe I'm asking too much... Nice to dream though!!

28th August 2003, 05:22 AM	#4
bmcevers diyAudio Member Join Date: Aug 2003 Location: SoCal	Yes, I know there is no Zobel on the output stage, I left it out for space reasons.

28th August 2003, 05:28 AM	#5
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	I can't open zips without a lot of trouble. Sorry.

28th August 2003, 05:52 AM	#6
bmcevers diyAudio Member Join Date: Aug 2003 Location: SoCal	.gif (hint, hint Mr. Curl)

28th August 2003, 05:58 AM	#7
bmcevers diyAudio Member Join Date: Aug 2003 Location: SoCal	I can't get the file size small enough so that I can directly post it. I guess I am out of luck.

28th August 2003, 06:03 AM	#9
bmcevers diyAudio Member Join Date: Aug 2003 Location: SoCal	Finally!

28th August 2003, 06:08 AM	#10
sajti diyAudio Member Join Date: Apr 2003 Location: Vác, Hungary	It looks nice. My only problem is that the emitter resistors for the output stage, are too low. There will be hard to fix the bias current with this value. I use 0.22ohms at least. Sajti