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RJM Audio Sapphire Desktop Headphone Amplifier
RJM Audio Sapphire Desktop Headphone Amplifier
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Old 29th May 2019, 12:33 PM   #1491
kamoris is offline kamoris
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Hi
Maybe a silly question but i want to build ver.4,
i check schema and board in eagle. On schema tehere is nice ground path conencting gnd, zeneres, caps and etc.
But on board there is no connection. Is it right or something wrong is with my eagle ??
On print screens i shows what i worry about.
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Old 29th May 2019, 11:08 PM   #1492
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Richard Murdey
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RJM Audio Sapphire Desktop Headphone Amplifier
When you load the .brd file into Eagle the polygon fills are only indicated by a dotted outline. Click the "ratsnest" button to fill the polygons and properly display the Sapphire's ground plane.
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Old 31st May 2019, 07:09 AM   #1493
kamoris is offline kamoris
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Quote:
Originally Posted by rjm View Post
When you load the .brd file into Eagle the polygon fills are only indicated by a dotted outline. Click the "ratsnest" button to fill the polygons and properly display the Sapphire's ground plane.



Ok i do it, now it seems ok. But i just already ordered pcb from jlc, hope that gerbers will be fine ( i genereated these file wihtout cliking rastnest button).
Will see when pcb will come next week.


Also i have next question. How crucial are parameters of c10,11 bypass capacitors?? Then can vary slight?? And is it must be x7r capacitors ?
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Old 31st May 2019, 12:46 PM   #1494
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Richard Murdey
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RJM Audio Sapphire Desktop Headphone Amplifier
The polygons are present whether they are visible or not, it does not effect the Gerber data.

No particular requirements for the bypass caps, except reasonably low ESR.
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Old 25th June 2019, 01:33 PM   #1495
Dibya is offline Dibya
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Which resistor are used in this amp ? The black resistors looks classy.
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Old 11th July 2019, 11:25 PM   #1496
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Richard Murdey
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RJM Audio Sapphire Desktop Headphone Amplifier
The black ones are probably Welwyn. They were discontinued a long time ago.
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Old 11th July 2019, 11:28 PM   #1497
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Richard Murdey
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RJM Audio Sapphire Desktop Headphone Amplifier
One of my recent emails was from someone asking about running the Sapphire from a single 12 V supply.

It's doable, with some performance hits due to the reduced voltage and asymmetrical design. The simplifications might be worth it for some however, so I'm thinking about at least making a board layout for it. It can be a headphone amp or a preamp/line driver.

Anyone else interested?
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Old 12th July 2019, 05:41 AM   #1498
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You can just add a Jan Didden Silent Switcher, with which you can generate low noise +/-15V from a single supply as low as 5V (USB).
No need to compromise.

The SilentSwitcher | Linear Audio NL
SilentSwitcher - mains-free +/-15V and 6/5/3.3V power


Cheers,
Patrick
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Old 12th July 2019, 05:47 AM   #1499
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For portable applications, I have also used LTC3265, which is all in one.
New Audio Op Amp - OPA1622
(Post #297)


Patrick
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