My OPA1656 RIAA PreAmp (one more)

Yes stocktrader200 , I am very curious to listen to it with some of my favorite records.
I read that after about twenty hours it stabilizes and sounds even better. We'll see.
Since you're talking about it, the next cartridge I would like to buy (later...), is the VM540ML (precisely, a Micro Line).
It too, in its price range (around 240 euros), seems to be a great cartridge, but certainly more demanding than the VM95C.
 
Short update.
Revision 0.1b of MarcelvdG's circuit with High-Pass filter.
  • I added the 3x DIP switch to the schematic to select the input capacitance.
  • I created a multiple footprint of the 2.2uF input capacitor, capable of accommodating most of the medium-sized polypropylene and film capacitors.
  • The headers for the selection (via single Jumper) of the filter slope near the OP-Amp, are with 1.27mm pitch.
I have not added the ground plane yet, it is the next step.

RIAA-Pre_HPF_MG_01b_01.JPG


RIAA-Pre_HPF_MG_01b_02.JPG


RIAA-Pre_HPF_MG_Lay_01b_03_.jpg


It seems pretty good to me.
What do you think?
 

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Hi mlloyd1 and MarcelvdG 🙂
Thanks a lot for checking.
Today I fixed small defects of the silkscreens, added the ground plane on the bottom and spaced the positive input pins (L and R) to 32 mm.
And this is also the recommended size for the RCA input connector holes on the rear panel, to keep the cable connection points very close.
I attach the last layout preview, then in the next few days I will prepare the files for printing.
The last SMD components ordered, should be available at JLCPCB in early May.
As soon as I have them all, I will proceed.

RIAA-Pre_HPF_MG_Lay_01b_05.jpg


I was forgetting to say hello and thank arjen6t8 and twitchie too! 😉
 
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