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Sound & Comfort MC/MM Phono preamp
Sound & Comfort MC/MM Phono preamp
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Old 8th October 2016, 05:03 PM   #1
Koifarm is offline Koifarm  Netherlands
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Default Sound & Comfort MC/MM Phono preamp

Dear DIYaudio community,

after building several phono preamps, i have still new ideas.
Today i started to draw a new design.
I combined some projects from my past.
The sound signature of the OPA627 opamp i combine with the spatial sound of the 2C51 tube. For comfort i use arduino mega with color touchscreen and remote to control the preamp.

Next i will design the PCB's.

Some spec's to start with:

- 3 inputs
- MC and MM
- Remote input, gain and cartridge loading switching.
- Color touchscreen

Ronny
Attached Images
File Type: jpg Sound&Comfort-schematic.jpg (758.5 KB, 861 views)
Attached Files
File Type: pdf Comfort&sound - Schematic.pdf (114.0 KB, 86 views)

Last edited by Koifarm; 8th October 2016 at 05:54 PM.
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Old 8th October 2016, 05:33 PM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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The two IC pinouts are drawn wrong. Pin 2 is inverting input not pin 3.
If it is wired like your schematic, where is the feedback loop on the ICs?
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Old 8th October 2016, 05:34 PM   #3
buzzforb is offline buzzforb  United States
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Will you have some extra boards to part with if it is successful
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Old 8th October 2016, 05:49 PM   #4
Koifarm is offline Koifarm  Netherlands
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Quote:
Originally Posted by JonSnell Electronic View Post
The two IC pinouts are drawn wrong. Pin 2 is inverting input not pin 3.
If it is wired like your schematic, where is the feedback loop on the ICs?
Thanks, my fault. I will change it.


Quote:
Originally Posted by buzzforb View Post
Will you have some extra boards to part with if it is successful
No, i only make my own boards. But i will publish gerber files so you can order/make your own pcb's.

Last edited by Koifarm; 8th October 2016 at 05:55 PM.
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Old 8th October 2016, 06:12 PM   #5
Koifarm is offline Koifarm  Netherlands
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Not fast enough to make the changes.
See below for altered schematic.
Attached Images
File Type: jpg Sound&Comfort-schematic.jpg (759.1 KB, 817 views)
Attached Files
File Type: pdf Comfort&sound - Schematic.pdf (114.1 KB, 36 views)
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Old 23rd October 2016, 03:16 PM   #6
Koifarm is offline Koifarm  Netherlands
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Today i designed the preamp PCB to test the prototype.

You can devide the PCB in two. Between preamp and powersupply.
Tubesockets can be mount on bottom or top side.

Changed schematic with better anode supply for tubes.

Ronny
Attached Images
File Type: jpg Comfort&sound---layout.jpg (738.0 KB, 632 views)
Attached Files
File Type: pdf Comfort&soundamp - SchematicA.pdf (60.6 KB, 67 views)
File Type: pdf Comfort&soundamp - PCBA.pdf (81.1 KB, 28 views)
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Old 25th October 2016, 05:45 PM   #7
Kay Pirinha is offline Kay Pirinha  Germany
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Hi Koifarm,

I guess you won't heat your 2C51's from 12 V, will you?

Best regards!
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Old 25th October 2016, 06:33 PM   #8
Koifarm is offline Koifarm  Netherlands
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Thanks , it is good that i not have ordered 100 PCB's.

I connect the heaters in serie to the 12v as in the phonodude design.

I will change the pcb design and schematic.
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Old 26th October 2016, 03:49 PM   #9
Koifarm is offline Koifarm  Netherlands
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Changed heaters in serie.
Attached Images
File Type: jpg comfort&sound-pcb2.jpg (741.3 KB, 509 views)
Attached Files
File Type: pdf Comfort&soundamp - Schematic2.pdf (60.4 KB, 54 views)
File Type: pdf Comfort&soundamp - PCB2.pdf (81.0 KB, 29 views)
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Old 26th October 2016, 04:26 PM   #10
Kay Pirinha is offline Kay Pirinha  Germany
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Good ID! But you'd better adjust the regulator for 12.6 volts output.

Best regards!
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