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Merlin RIAA Preamp
Merlin RIAA Preamp
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Old 11th May 2019, 10:17 AM   #91
bandol83 is offline bandol83  France
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I am not sure that SMPS would be a good solution for the RIAA amplifier since the input sensitivity is only few mV and it is therefor very sensitive to switching noise
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Old 21st May 2019, 01:18 PM   #92
wicked1 is offline wicked1  United States
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Quote:
Originally Posted by bandol83 View Post

I will put the Gerber files on the forum since there are several requests, if someone want to make a Group Buy, let me know ?

Best regards,
Marc
Are you still willing to share your files?
I received the tubes and some other parts to build the riaa preamp.
And if I have PCB's made, I'd certainly be willing to share the 8 PCB's out of the set that I don't use. It's not quite a 'group buy', but would get some of us some PCB's.
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Old 21st May 2019, 06:36 PM   #93
petertub is offline petertub  Sweden
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Merlin RIAA Preamp
Quote:
Originally Posted by bandol83 View Post
I am not sure that SMPS would be a good solution for the RIAA amplifier since the input sensitivity is only few mV and it is therefor very sensitive to switching noise
I know that it will a challenge. But i will have less hum from the B+, and

high freq noise can be filtered out, it will take some time to find an optimal
solution.
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Old 22nd May 2019, 12:52 PM   #94
bandol83 is offline bandol83  France
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Hello Scott,

I answered your PM, sorry for the delay I have been quite busy these days

Hi Petertub, Rongon and others interested by PCB,

It seems that wicked1 will be selling few PCB, please feel free to contact him if you are interested

Cheers,
Marc
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Old 24th May 2019, 02:28 PM   #95
wicked1 is offline wicked1  United States
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To the few guys who asked for PCB's, do you have a color preference? The manufacturer I'm planning to use doesn't charge extra for different colors..
Green, Blue, or Matte Black?
I have enough red PCB's.. White would probably get ugly from hand soldering and heat from usage.
Black won't show heat marks, which might be good, but might also be bad, because you can't see which parts are getting too hot.

Anyway, it doesn't really matter. I might have ordered them before I get any replies....
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Old 24th May 2019, 02:36 PM   #96
petertub is offline petertub  Sweden
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Merlin RIAA Preamp
I have no opinion on color, as long as any component text is visible.
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Old 24th May 2019, 02:40 PM   #97
wicked1 is offline wicked1  United States
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I'm leaning towards matte black.. I don't have any of those. I have shiny black, but not matte.
This manufacturer doesn't have any options listed for silkscreen.. I'm assuming they'll use white on a black board.
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Old 1st June 2019, 12:15 AM   #98
jazbo8 is offline jazbo8
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Merlin RIAA Preamp
Please conduct group buy related discussions here: GB: Merlin RIAA PCB
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Old 3rd June 2019, 02:51 AM   #99
SCD is offline SCD  Canada
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Hello Marc:
I have read this thread but have not been able to determined the gain of the phono stage. Could you indicate what the gain is for me.
Thanks
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