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Old 5th August 2010, 07:08 PM   #4331
Salas is offline Salas  Greece
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Quote:
Originally Posted by SGregory View Post
A soundcard will drive an impedance of 1k to 3k?
My EMU tracker does it, but loses max out V than with say 100k. Can go from 2.17V down to 1.35V. So I check its 0dB non clipped on the actual divider as load and I feed data to the software cal. Then if I tell it to give say 250mV I check it actually listens with that load or having to trim settings. Also under 100mVout most cards don't listen that well so I see if I have to instruct it 67mV to really feed 60mV for instance.
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Old 5th August 2010, 07:15 PM   #4332
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I will look at it. I will be using an EMU 401.
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Old 8th August 2010, 03:13 AM   #4333
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A little bit of update for peer review. Attached are photo's of the steel box mounted in the chassis. I soldered a ground connection to the top and bottom and intend to run it to the chassis ground stab.

Another photo shows how the pc boards are mounted in the box with the output caps leading to the RCA connectors. The blue hose is the Force and Sense that will lead to the shunt regulators. They will be mounted on the heat sinks. Initially I will use the toroid transformer shown earlier, but after reading up on the Rcore xfmr I have one on order and will switch it out at some point in the future.

In the photo, I do not have the rear panel attached as I need to mill out the opening for the RCA connectors to pass through and mount the IEC power conector. I still intend to run the AC mains in a shielded cable or in some steel pipe to minimize the pick-ups. I made the box big enough to be able to change out the pc board with new designs if need be.

Let me know what I could do to improve it. Thanks

P.S. I have some temporary riaa caps installed while for circuit testing, I hope the Russian ones arrive soon.
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Old 8th August 2010, 11:24 AM   #4334
Salas is offline Salas  Greece
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I say its a very nice job for housing high gain low level circuits no matter changes in the basic pcbs that might be or not. Including the minimum field R-Core and already having wide voltage adjustment range in the regs you are well equipped.

*Give it a go with the temporary caps to see if everything works without mistakes meantime.
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Old 9th August 2010, 02:00 PM   #4335
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Arrived today mine R-Core Tx: two 2x24V 120VA + two 2x21V 120VA

Click the image to open in full size.

2x21 for Salas NJFET RIAA & 2x24 for Erno Borbely I/V

Last edited by merlin el mago; 9th August 2010 at 02:02 PM.
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Old 9th August 2010, 02:50 PM   #4336
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merlin,
Would you be so kind and PM me where you obtained them from. I orderd mine from ebay but there are limited secondary voltages available and I have no idea on the quality as of yet.
Thanks
Scott
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Old 9th August 2010, 03:08 PM   #4337
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Scott, I purchased them in France: Selectronic, link web site:

SELECTRONIC ::: L'univers électronique :::
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Old 9th August 2010, 09:12 PM   #4338
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Hi Merlin

What are you using to feed the I/V stage ? A Salas shunt ?
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Old 9th August 2010, 09:31 PM   #4339
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Hi Ricardo,

Yes now I'm using a Hypnotize Salas regulator but I have also the all-fet discrete regulator by Borbely Audio.
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Old 9th August 2010, 09:52 PM   #4340
RCruz is offline RCruz  Switzerland
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Hum.... So you can compare... let us know the differences

Does the Borberly I/V perform bessel filtering after the dac ?

What dac are you using ?
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