Line stage preamp, based on SY's "Heretical Unity gain line stage" - Page 3

SY · 17th July 2005, 10:02 PM

No, it's a full redesign if you want gain higher than unity.

Danko · 17th July 2005, 10:10 PM

Okay, you convinced me! :-)

here are some pictures!

http://sziget.mine.nu/~danko/aramkor...p/dscn7257.jpg
http://sziget.mine.nu/~danko/aramkor...p/dscn7256.jpg
http://sziget.mine.nu/~danko/aramkor...p/dscn7253.jpg
http://sziget.mine.nu/~danko/aramkor...p/dscn7252.jpg
http://sziget.mine.nu/~danko/aramkor...p/dscn7251.jpg =-> state of the art wiring :-)

Steve Eddy · 17th July 2005, 11:07 PM

Quote:

Originally posted by SY
You could use an input transformer with a small step-up ratio. That would be easiest.

Here's a schematic for both 1:2 and 1:5 step up transformers with the RC network values optimized for 10k and 50k loads so they can be used with standard potentiometer values.

For a 1:10 like the CineMag CMMI-10C, just load it with 100k and no RC network.

se

rdf · 18th July 2005, 04:07 AM

Many thanks for the transformer info, I've been looking for exactly this but passed by those marked as microphone step-ups. Any concerns about running the Cinemag's at consumer audio level? Are they conservatively rated? Thanks again in advance.

17th July 2005, 10:02 PM	#21
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	No, it's a full redesign if you want gain higher than unity. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

17th July 2005, 10:10 PM	#22
Danko diyAudio Member Join Date: Apr 2004 Location: Hungary	Okay, you convinced me! :-) here are some pictures! http://sziget.mine.nu/~danko/aramkor...p/dscn7257.jpg http://sziget.mine.nu/~danko/aramkor...p/dscn7256.jpg http://sziget.mine.nu/~danko/aramkor...p/dscn7253.jpg http://sziget.mine.nu/~danko/aramkor...p/dscn7252.jpg http://sziget.mine.nu/~danko/aramkor...p/dscn7251.jpg =-> state of the art wiring :-) __________________ Best regards, Danko

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18th July 2005, 04:07 AM	#24
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	Many thanks for the transformer info, I've been looking for exactly this but passed by those marked as microphone step-ups. Any concerns about running the Cinemag's at consumer audio level? Are they conservatively rated? Thanks again in advance.

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