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Old 22nd September 2013, 04:04 PM   #10161
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Default to minimise the loop area of that long loop

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Originally Posted by AndrewT View Post
if one connects the returns at the Source and one also has the returns connected somewhere downstream, then one has created a very long loop. That loop is very likely to have problems with picking up interference.
Recently I can across a dual coax with the screens in contact. That would be one way to minimise the loop area of that long loop.
I have never seen any project describe how to avoid this stereo source to stereo receiver loop.
There are a couple of papers that describe methods of reducing the current in these loops.
This is what I made for my BHL Phono amp. Please correct my drawing if you see something wrong in it.

Please note, this is not a Folded Simplistic.
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File Type: jpg Inputs and outputs.jpg (81.1 KB, 292 views)

Last edited by alexkosha; 22nd September 2013 at 04:14 PM.
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Old 23rd September 2013, 10:31 AM   #10162
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Hi ,
just bought the kit , and working on the PSU.
Does anyone can recommend on boxes for PSU and PCBs (where to order ?)
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Old 23rd September 2013, 10:40 AM   #10163
AndrewT is offline AndrewT  Scotland
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Build your PSU, then add on your amplifier. Only after you see how big it is and how you can package all the bits can you decide on the shape and size of the box.
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regards Andrew T.
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Old 23rd September 2013, 11:46 AM   #10164
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off course I will do that.
The question is , is there a vendor the produce certain boxes that are recommended ?
Can the PSU box be made of Plastic (I guess the PCB need an Aluminium case) ?

TNX
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Old 23rd September 2013, 01:41 PM   #10165
Salas is offline Salas  Greece
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The DIYA store has many adequate boxes lately:
Compact with Quasi Heatsinks - Chassis
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Old 23rd September 2013, 02:09 PM   #10166
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Hi Salas.
I will be using your phonostage with a Myref RevC amp through a passive 10k attenuator. Is the 2.2uf value of the output capacitor enough? Or should i use a 4.7uf output cap?
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Old 23rd September 2013, 02:21 PM   #10167
Salas is offline Salas  Greece
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0.1uF C3 and 3.3uF C4 will do well for 10K preamp input Z.
(Keeping near to the original integrated subsonic roll off curve)
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Old 23rd September 2013, 02:32 PM   #10168
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Thanks Salas
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Old 27th September 2013, 07:20 PM   #10169
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Salas I put your stage as in the pdf on nelson b1 buffer .All credit to you :its fantastic .
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Old 27th September 2013, 07:23 PM   #10170
Salas is offline Salas  Greece
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The folded one? For MM or MC? Any pics?
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