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The Phonoclone and VSPS PCB Help Desk
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Old 7th November 2017, 01:12 AM   #3781
rjm is offline rjm  Japan
Richard Murdey
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Quote:
Originally Posted by Lohengrimas View Post
Ah, right, what changed? And which other designs work better with your phono stages?
I've punted on designing my own power amp, I'm still using the Treasure 0347.

Though the temptation to slap some big headsinks on the Sapphire 4 and connect it to speakers is strong, truth be told the 0347 isn't so far off exactly that.
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Old 7th November 2017, 01:23 AM   #3782
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Originally Posted by Pokerback47 View Post
OpAmps for the VSPS 200/400.

The OPA 134 works perfectly in these circuits. The Analog Device's AD797 however does'nt - too my surprise I might add. The sound being highly distorted and with no signal "motorboating" is clearly audible.
Any suggestions would be appreciated as the AD's are rather costly.
The AD797 is not suitable as the front end of a MM phono stage.

Please search this thread for "AD797" for the details, paying particular attention to vulejov's comments. As he notes, the AD797 can be used by reconfiguring the VSPS as an MC phono stage, making appropriate modifications.
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Old 7th November 2017, 04:17 PM   #3783
Lohengrimas is offline Lohengrimas  Netherlands
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Originally Posted by rjm View Post
I've punted on designing my own power amp, I'm still using the Treasure 0347.

Though the temptation to slap some big headsinks on the Sapphire 4 and connect it to speakers is strong, truth be told the 0347 isn't so far off exactly that.
Interesting, I wasn't aware of the DIY kits from 47 labs. As for me, my audiosector GC works pretty great with my Markaudio speakers and are clearly a cut above the ss receivers/TPA3116/TA2024 amps I've used with them before.
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Old 8th November 2017, 12:34 PM   #3784
ALPUY is offline ALPUY  Uruguay
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Richard, they arrived !!!!!
Very good quality and appearance. Thanks for the "little gift".
Now to assemble it. I will try to do it with the best quality components I can get.
Greetings. Then I will comment. For now I'm still with VSPS 300.

Click the image to open in full size.
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Old 8th November 2017, 01:51 PM   #3785
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You're welcome!

I think you are the first to assemble the VSPS400, so please pay close attention to the BOM. If something looks odd it's probably a mistake.

I'm very interested to learn your listening impressions 300->400.

/R
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Old 23rd November 2017, 04:57 AM   #3786
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A completed VSPS400 board, for reference.
Attached Images
File Type: jpg IMGP7548cs.jpg (347.7 KB, 155 views)
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Old 27th November 2017, 11:30 AM   #3787
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Richard Murdey
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revised c3 BOM for the Emerald phono stage

- forgot to include the jumper and pin header in the BOM / fixed
- incorrect p/n given for the optional screw terminals / fixed
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File Type: zip pcb-emerald-10c3-bom.zip (349.8 KB, 23 views)
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Old 27th November 2017, 12:30 PM   #3788
ALPUY is offline ALPUY  Uruguay
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Richard, I'm making the list of materials to assemble the VSPS400.
I have to buy them on eBay, since quality components are not available in Uruguay.
The idea is to use resistors Dale metal film 1%, capacitors silver mica Cornell Dubilier 1n 1%, electrolytic Nichicon KZ MUSE
I ask, does R5 have to be a carbon resistor?
Greetings, JosŤ.
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Old 27th November 2017, 04:12 PM   #3789
Mr Onion is offline Mr Onion  United Kingdom
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Originally Posted by rjm View Post
<snip>
Finally, I recently discovered Triad VPM medical transformers with screen and shield are available at digikey and similar outlets. So today, I would change my recommendation from "bigger" to "better" and suggest everyone goes with the VPM if they want to upgrade their power supply.
I know its going back over a year, but I have a question about the Triad Transformers. The datasheet states

Quote:
Primary and secondary windings are designed to be connected in series or parallel. Windings are not intended to be used independently.
Source

As the power supply rectification does not directly connect the windings, does this mean that its not suitable?

I'm using a PC3 for now, maybe a PC4 later on.
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Old 27th November 2017, 11:04 PM   #3790
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@ALPUY No, carbon composition is recommended for R5 (a quirk of mine), but any type of resistor can be used.

@Mr Onion The secondaries are always tied together and through just ~1.2V diode drop of the rectifiers. Though now that you bring it up, with my recommended 2-bridge connection scheme the side of the winding connected to COM does flip back and forth every cycle. I don't think it makes a big difference to performance if you connect as I have shown. But I am open to discussion on it.
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Last edited by rjm; 27th November 2017 at 11:06 PM.
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