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-   -   Sound & Comfort MC/MM Phono preamp (http://www.diyaudio.com/forums/analogue-source/297718-sound-comfort-mc-mm-phono-preamp.html)

Koifarm 8th October 2016 05:03 PM

Sound & Comfort MC/MM Phono preamp
 
2 Attachment(s)
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 :)

JonSnell Electronic 8th October 2016 05:33 PM

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?

buzzforb 8th October 2016 05:34 PM

Will you have some extra boards to part with if it is successful

Koifarm 8th October 2016 05:49 PM

Quote:

Originally Posted by JonSnell Electronic (http://www.diyaudio.com/forums/analogue-source/297718-sound-comfort-mc-mm-phono-preamp-post4851199.html#post4851199)
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.:ashamed: I will change it.


Quote:

Originally Posted by buzzforb (http://www.diyaudio.com/forums/analogue-source/297718-sound-comfort-mc-mm-phono-preamp-post4851200.html#post4851200)
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.

Koifarm 8th October 2016 06:12 PM

2 Attachment(s)
Not fast enough to make the changes.
See below for altered schematic.

Koifarm 23rd October 2016 03:16 PM

3 Attachment(s)
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

Kay Pirinha 25th October 2016 05:45 PM

Hi Koifarm,

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

Best regards!

Koifarm 25th October 2016 06:33 PM

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.

Koifarm 26th October 2016 03:49 PM

3 Attachment(s)
Changed heaters in serie.

Kay Pirinha 26th October 2016 04:26 PM

Good ID! But you'd better adjust the regulator for 12.6 volts output.

Best regards!


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