Get rid of cap from PEARL???

coffin · 21st December 2002, 01:54 PM

Pearl phono stage seems to be the excellent RIAA stage.
But if we get rid of the coupling Cap between 1st and 2nd stage??
Is anybody know how to do it or suggestions?
Thanks

Coffin

coffin · 27th December 2002, 01:00 AM

Hi
I don't think I can keep the gain of second stage unchanged.

So I give up.........

Unless somebody hace a better idea

GRollins · 29th December 2002, 09:29 PM

If you eliminate C11 and C12, you'll skew the RIAA EQ. Setting that aside, you could offset Q6 above ground by the 15V volts or so that it would take to put it at the same potential as the collector of Q5. The best way to do it would be a separate power supply, lifting 'ground' and the rail both. There's a DC blocking cap at the output, so DC offset at the signal output wouldn't be a problem.

Grey

coffin · 30th December 2002, 01:05 AM

Quote:

Originally posted by GRollins
If you eliminate C11 and C12, you'll skew the RIAA EQ. Setting that aside, you could offset Q6 above ground by the 15V volts or so that it would take to put it at the same potential as the collector of Q5. The best way to do it would be a separate power supply, lifting 'ground' and the rail both. There's a DC blocking cap at the output, so DC offset at the signal output wouldn't be a problem.

Grey

Yes I can recalculate RIAA.
Floating is the only way......

THANX

21st December 2002, 01:54 PM	#1
coffin diyAudio Member Join Date: Oct 2002 Location: Taiwan	Get rid of cap from PEARL??? Pearl phono stage seems to be the excellent RIAA stage. But if we get rid of the coupling Cap between 1st and 2nd stage?? Is anybody know how to do it or suggestions? Thanks Coffin

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27th December 2002, 01:00 AM	#2
coffin diyAudio Member Join Date: Oct 2002 Location: Taiwan	Hi I don't think I can keep the gain of second stage unchanged. So I give up......... Unless somebody hace a better idea

29th December 2002, 09:29 PM	#3
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	If you eliminate C11 and C12, you'll skew the RIAA EQ. Setting that aside, you could offset Q6 above ground by the 15V volts or so that it would take to put it at the same potential as the collector of Q5. The best way to do it would be a separate power supply, lifting 'ground' and the rail both. There's a DC blocking cap at the output, so DC offset at the signal output wouldn't be a problem. Grey

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