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Old 6th January 2012, 12:24 PM   #891
Salas is offline Salas  Greece
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The guide specifies twisting, so all well done. Sensitivity to this has to do with the client audio boards layout to an extent too. Thanks for the detailed feedback on BA amps and regs.
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Old 7th January 2012, 11:33 AM   #892
kp93300 is offline kp93300  Malaysia
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Default Q102

I am seeking clarification on the schematic .

Q 102 is specified as a jfet but the line symbols appear as a bjt.
Which pin is the gate, source and drain ?
thanks
kp93300
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Old 7th January 2012, 11:37 AM   #893
AndrewT is offline AndrewT  Scotland
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An Nch jFET has the Drain to +ve and the Source to -ve.
A Pch jFET has the Drain to -ve and the Source to +ve.
See Q105 & Q205 as examples.

The gate is usually connected towards the Source voltage. Vgs is usually quite low, zero millivolts to 2Vgs
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Last edited by AndrewT; 7th January 2012 at 11:40 AM.
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Old 8th January 2012, 07:19 AM   #894
kp93300 is offline kp93300  Malaysia
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Thanks AndrewT
i am starting on a build of this for a USB spdif converter.
kp93300
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Old 10th January 2012, 08:05 PM   #895
alazira is offline alazira  United States
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Quote:
Originally Posted by Salas View Post
The guide specifies twisting, so all well done. Sensitivity to this has to do with the client audio boards layout to an extent too. Thanks for the detailed feedback on BA amps and regs.
Hi,
For clarification, do you twist +/- together and sense +/- together and keep separately or twist these 2 pairs together as well?
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Old 10th January 2012, 08:40 PM   #896
Salas is offline Salas  Greece
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I had done both, but in most cases I just run the two twisted pairs close together. I had also used one CAT5 as below.
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Old 11th January 2012, 08:06 AM   #897
AndrewT is offline AndrewT  Scotland
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Think of it as loop area.
The sense circuit measures the voltage between the two ends. If there is a loop inside the sense circuit then that could pick up interference.
That interference will generate an error in the sense measurement.

Similarly the force (main current flow loop) circuit contains a loop. Minimise the loop area.

I tried to get this message across what now seems like years ago, but seem not to have explained it at all well since hardly anyone has picked up on it.
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Old 11th January 2012, 09:19 AM   #898
PET-240 is offline PET-240  Australia
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Ok, loop makes sense,

Question, is it Supply+ and Sense+ twisted together or Supply+ and Supply- twisted together?

Thanks,
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Old 11th January 2012, 09:56 AM   #899
RCruz is offline RCruz  Switzerland
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Try to minimize the two loops.
Twist Force+ and - together. Twist Sense + and - together.
Keep both twisted pairs twisted or close together also.
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Old 11th January 2012, 01:30 PM   #900
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This is the cable I'm using at present and it sounds good for the split rail supply to the BA-2 front end: Cat 5e Network Cable UTP Stranded : Cat5e Network Cables : Maplin Electronics

Since my last post I have improved the sound still further. Although using the above cable improved the level of detail and lowered background noise (better than using single wire connectors) there was a loss of bass extension and a somewhat fuzzy presentation of musical images. I reasoned that the RC circuits of the BA-2 might be responsible for interfering with the shunt regulator. I checked with Zen Mod that it was OK to remove the 1000uF caps (C205, C206) and short the R210 and R211. This has now been completed and the improvements are very significant. Clean musical images with effortless detail are now apparent and although the former isn't as precise as the BA-3 the two front ends sound very similar in this respect. Bass reach and detail have improved also and there is a real snap to the leading edges and timing so at this stage I would be happy to say I am getting the best out of the regulator/FE combination (probably!).
Chris
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