Line stage preamp, based on SY's "Heretical Unity gain line stage" - Page 3 - diyAudio
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Old 17th July 2005, 10:02 PM   #21
SY is offline SY  United States
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No, it's a full redesign if you want gain higher than unity.
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
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Old 17th July 2005, 10:10 PM   #22
Danko is offline Danko  Hungary
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Okay, you convinced me! :-)

here are some pictures! =-> state of the art wiring :-)
Best regards, Danko
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Old 17th July 2005, 11:07 PM   #23
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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.

Click the image to open in full size.

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Old 18th July 2005, 04:07 AM   #24
rdf is offline rdf  Canada
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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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