Flat Balanced Input Moving Coil Phono Preamp Construction Information

Construction information for DIY projects, including the MS Mid Side Matrix, Elliptic Equalizer, Mastering Console, Phono Transfer System, Insert Switcher and the Dual Class-A Amplifier. You can post your baby pictures here.
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mediatechnology
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Re: Flat Balanced Input Moving Coil Phono Preamp Construction Information

Post by mediatechnology » Sun Dec 29, 2019 8:32 pm

Very nice!

I tried the MC preamp with the TDK switcher and as long as the preamp board wasn't near the primary-side and heat sink bar it was as quiet as the linear bench supply.
With yours at right angles and on the far side of primary it ought to be quiet as well.

I like the RJ-45 bulk-head female-to-female termination. I would never have thought to use a RJ-45 turn-around. That's very clever.

You might want to reverse the jumper shunts - they're upside-down from they way I usually install them and will be easier to pull if inverted on the header with the large end on the top. They're easier to grab with needle-nose.
https://ka-electronics.com

"States Ordered To Fraudulently Inflate COVID-19 Cases 15 Times Actual Rate"
https://banned.video/watch?id=5efab695672706002f367a0a
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grufti
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Re: Flat Balanced Input Moving Coil Phono Preamp Construction Information

Post by grufti » Mon Jan 20, 2020 7:33 pm

I can report on two improvements since I finished the MC preamp. I switched to tabbed jumper shunts. Those are so much easier to move around and I had simply run out.

The other item is more interesting. I found a very nice 5W +/-15V switcher at mouser for $20. It's a RECOM RAC05-15DC. The 10W version RAC10-15DK/277 costs only $10. Not sure why that is. I'm very happy with the tiny 5W switcher.

https://www.mouser.com/ProductDetail/RE ... KYOmsuw%3D
https://www.mouser.com/ProductDetail/RE ... vSbg%3D%3D

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mediatechnology
Posts: 4414
Joined: Sat Aug 11, 2007 2:34 pm
Location: Oak Cliff, Texas
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Re: Flat Balanced Input Moving Coil Phono Preamp Construction Information

Post by mediatechnology » Mon Jan 20, 2020 8:01 pm

I put one of those supplies in my cart to check out on the bench.
Thanks for sharing that.
https://ka-electronics.com

"States Ordered To Fraudulently Inflate COVID-19 Cases 15 Times Actual Rate"
https://banned.video/watch?id=5efab695672706002f367a0a
"Plandemic/Doctors In Black" https://proaudiodesignforum.com/content/Plandemic.mp4

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