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Old 26th August 2008, 08:32 PM   #11
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Hi Raphael,

It looks like you are using a MAC. What schematic capture software are you using? I'm a recent convert to the iMac. What an awesome machine with OSX 15.5!

I cannot wait to get completely off Windows, and now need a good Mac based schematic caputre program.

Thank you,

-David
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Old 26th August 2008, 08:34 PM   #12
uli is offline uli  Austria
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IMO it wont work with both sides of a current mirror

Uli

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Old 26th August 2008, 09:09 PM   #13
jam is online now jam  United States
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Hi Uli,

Long time no see................you are right the current mirror has to be replaved with active loads or resistors. John Lindsey Hood has a design for a symetrical currernt mirror that might work in this application. It was publisrd in Wireless World years ago.

Regards,

Jam
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Old 26th August 2008, 09:12 PM   #14
uli is offline uli  Austria
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Jam, old fella

did they pardon you, didnt know that! Happy about that!

Regards Uli

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Old 26th August 2008, 10:10 PM   #15
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The bigger the fall, the greater the redemption.

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Old 26th August 2008, 11:06 PM   #16
rkn is offline rkn  Germany
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OK, bad idea with current mirror. With a little bit thinking about it I night find it out myself... I'll return bac to the first verison with the resistors.

David, I'm using gEDA: www.geda.seul.org Originally it was written for Linux but after MacOSX arrived it is also possible to run it on a Mac. You'll find a MacOSX-bundle on the website.
I stopped working with Windows and changed to Linux two or three years ago. And I don't want Windows back. But after some bad experiences with HP I switched to Apple hoping that they sell a more reliable hardware. I like Apple. I've a Mac mini and a MacBook. Now I'm using both in parallel: Linux and MacOSX and cannot say which system is better, both have pros and cons. Ok that's offtopic.

Raphael
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Old 28th August 2008, 09:35 AM   #17
rkn is offline rkn  Germany
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Here is now the next version of the schematic. I removed the current mirror and added feedback.

Raphael

Click the image to open in full size.
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Old 28th August 2008, 10:01 AM   #18
forr is offline forr  France
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Quote:
Originally posted by jam
Hi Uli,

Long time no see................you are right the current mirror has to be replaved with active loads or resistors. John Lindsey Hood has a design for a symetrical currernt mirror that might work in this application. It was publisrd in Wireless World years ago.

Regards,

Jam
Hi Jam and Rkn,

See
http://www.diyaudio.com/forums/showt...090#post760090
schematics :
http://www.diyaudio.com/forums/showt...486#post760486
Also see following comments.

Regards.
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Old 28th August 2008, 07:57 PM   #19
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You will require some mechanism for adjusting and/or controlling the
absolute DC value of the outputs.
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Old 29th August 2008, 02:07 PM   #20
rkn is offline rkn  Germany
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For what? For my version or if I want to use the John Lindsey Hood current mirror?
What aboout an DC-Servo?

Raphael
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