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Old 8th April 2006, 01:56 AM   #1
maxpou is offline maxpou  Canada
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Question Riaa Pacific Jfet

I MAKE PCB FOR RIAA BUT I HAVE NOISE. SOMEBODY HAVE A PCB FOR THIS PHONO OR HOW I PLACED RCA GROUND AND PS GROUND. THANK'S
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Old 8th April 2006, 06:35 AM   #2
Electrons are yellow and more is better!
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How does your power supply look like?
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Old 8th April 2006, 02:06 PM   #3
maxpou is offline maxpou  Canada
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I HAVE A HAMMOND TOROIDAL TRANSFORMER 44V CENTER TAP 160VA, 4 CAP 4700UF NICHICON FW DECOUPLING 0.01 POLYESTER METAL BY CHANNEL. PHILIPS AND 2 REGULATORS 7824 VISHAY ONE FOR EACH CHANNEL. THANK YOU!
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Old 8th April 2006, 02:11 PM   #4
Netlist is offline Netlist  Belgium
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Maxpou,
Please turn off the Caps-lock. I'm sure it's not your intention but this style is considered as shouting.
As for the PSU, a schematic would be handy as well.

/Hugo
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Old 8th April 2006, 04:13 PM   #5
Electrons are yellow and more is better!
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7824 regulator might be too noisy, just a hunch. How much decoupling do you have after the regulators?
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Old 9th April 2006, 04:43 PM   #6
maxpou is offline maxpou  Canada
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i have 4 caps 4700uf decoupling with 0.01 by caps by regulator. thank you!!
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Old 10th April 2006, 02:09 AM   #7
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This circuit has a low first stage gain followed by the RIAA network attenation so it won't be that quiet. As Peranders has said, it is also very sensitive to supply noise.
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Old 10th April 2006, 04:47 AM   #8
maxpou is offline maxpou  Canada
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which circuit you propose for power supply?
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Old 10th April 2006, 11:23 AM   #9
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Hi,
Try batteries with as much bypass capacitance you can afford.
Apart from PSU, this is a forgiving circuit: it was my first project a while ago since 15 years or so and it worked quiet good.
Rüdiger
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Old 10th April 2006, 11:55 AM   #10
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you can use this "cleanup" circuit from Wenzel Associates -- the entire article can be found on their website. Just make sure that the opamp you use can take the voltage. (i.e. you don't want to use one of those low power, low voltage ones.)

Paralleling more 2sk170's on the front end will reduce "device" noise further (at the expense of more current consumption).

http://www.wenzel.com/documents/finesse.html

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