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Old 30th May 2004, 07:46 PM   #1
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Default Super fast, low noise phono preamp

Hi DIYers
This is a picture of my DIY Phono Preamp. Schematics as shown is MC section.


Value of resistors R7, R8, R12 and of capacitors C2 and C5 are critical components. It's important to match to original values as close as possible. Capacitor C5 is better to be MKP (poliprophylene). Potty P1 isn't necessary, but it's adjusted on DC component before resistor R7, to be as small as is possible. Potty P2 have to be adjusted on DC offset to be 0.That's simply to make. In the case, we want greater gain, R11 have to be smallest value. With value of 220 ohms, we obtain 6dB more on gain.

I expect your suggestions.

Best regards, Dioklecijan
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Old 30th May 2004, 07:49 PM   #2
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Inside
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Old 30th May 2004, 07:51 PM   #3
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Final front
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Old 31st May 2004, 06:30 PM   #4
Electrons are yellow and more is better!
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Nice work! Nice looking hand drawn schematic also.

Just wondering about C5 When You have gain more than 5-10 or this capacitors isn't very necessary, my opinion, but what is your reason for it?. Have you seen my LT1115/1028 vinyl amp.
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Old 31st May 2004, 06:43 PM   #5
jam is offline jam  United States
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Default Peranders...............

at it again.....................
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Old 31st May 2004, 07:21 PM   #6
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Congratulation Peranders,
you see exactly what I want.

In this case with LT1028 and OPA627 is not very necessary to put capacitor C5 here, but don’t forget there is MM section with OPA 2134 and more offset without trim.

I see your phono and other works before. Very nice! Beautiful works.
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Old 31st May 2004, 07:25 PM   #7
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LT1028 or LT1115 or AD797 what is your experience?
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Old 31st May 2004, 07:58 PM   #8
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LT1115 and LT1028 is the same IC but with different DC parameters.... and different price. I haven't tested AD797 yet.
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Old 31st May 2004, 08:23 PM   #9
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Look this:

Upgrade version with unique SRPP J-FET output stage


http://www.hiendfi.com/modules.php?n...rticle&sid=102
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Old 31st May 2004, 08:29 PM   #10
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I have mixed feelings about the split passive/actibve riaa. It never ever sounded good to me compared to either passive/split passive or active correction. Maybe i was just unlucky with that topology.
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