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Old 1st February 2014, 10:01 PM   #1561
Salas is offline Salas  Greece
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Default This is revision 1.2

Audio circuit rework. Mainly values.
All peripheral circuits remain the same.
THD at about 0.03% on nominal cart level, 2nd harmonic only.
Noise down to -86dBV@30Hz unweighted depending on input valve sample.
No perceptible harmonic noise when the SUT has a balanced primary and the cartridge is wired floating to it.
Only wide band random noise.
Curve is +/- 0.2dB 100Hz-15kHz including the SUT aberrations when R5,R6,C2,C3 are hand picked. R5=100K//100K. C3=15nF//750pF.
Suitable also for HOMC & MM sans SUT. Input overload: Beyond my oscilloscope's vertical capability at times 1.
Subjective impressions are enhanced vs. older version realizations.
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Old 2nd February 2014, 06:59 AM   #1562
vgeorge is online now vgeorge  Greece
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That's good news!
Is there a chance for a PCB in the future?
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Old 2nd February 2014, 09:10 AM   #1563
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Great, 2dBs more can help to use my 1:6 Partridge 977 step-up with my mod Denon DL103R
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Old 2nd February 2014, 09:44 AM   #1564
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I have several questions:

-R2 18K 1W?
-For R11 I have Kiwame 2W and Shinkoh 1/2W, wich one do you prefer carbon or tantalum?
-In place of LD1 infrared I have 1N4148, is ok or have I to change for 1,9V-2V red LED?

TIA
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Old 2nd February 2014, 09:58 AM   #1565
Salas is offline Salas  Greece
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-R2 1/4W
-Tant R9 R11
-Infrared only
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Old 2nd February 2014, 10:03 AM   #1566
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Wich one?

LEDs IR
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Old 2nd February 2014, 10:12 AM   #1567
Salas is offline Salas  Greece
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HIRL5020
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Old 2nd February 2014, 10:14 AM   #1568
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Many thanks
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Old 2nd February 2014, 10:16 AM   #1569
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Did you use the infrared as power on/off indicator?

BTW nice PC speakers
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Old 2nd February 2014, 10:24 AM   #1570
Salas is offline Salas  Greece
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He, he humor. It does not show any light to the human eye, its used for 1V bias @ 1mA.
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