The simplistic Salas low voltage shunt regulator - Page 502 - diyAudio
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Old 3rd May 2012, 08:22 PM   #5011
RCruz is offline RCruz  Switzerland
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Now I understand what you mean.

Regarding X102-4 maybe I could connect Emitter pin of Q104 and Q103 Gate together at - Sense.

As for the other + Sense, I do not know.

Please give me your opinion.
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Old 4th May 2012, 09:19 AM   #5012
AndrewT is offline AndrewT  Scotland
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You don't need to bring both e & s to the -sense PIN.
You simply choose one, or the other, or connect the two PINs together and run from that trace to -Sense. That corner of the bridge is the easiest to get right.

I would connect the +sense to the top of VR3. This is an attempt to equalise the impedances of the traces to the drain PIN and to that physically far too big 10uF. That cap compromises the layout. But route that +sense trace alongside the -sense trace, i.e. under R3, under R4 and along past Q3.
The sense traces MUST have the absolute minimum loop area, it would be better if one trace was directly above the other, on either side of a very thin double sided PCB.
That brings up another reason for 10uF being too big. Any interference picked up by the loop area of the cap is read as an error signal ! Look at the loop area for the leads and the adjacent resistors.
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Old 5th May 2012, 05:49 PM   #5013
RCruz is offline RCruz  Switzerland
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Ok

Please have a look at the new layout and let me know if it is better.

Also, would you please verify the connections on the mosfets ? I am not sure I did them correctly (my schematic is viewed from the parts side).
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Old 6th May 2012, 12:20 AM   #5014
Salas is online now Salas  Greece
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C2 could narrow the lower green loop if put horizontally.
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Old 6th May 2012, 06:30 AM   #5015
dejanm is offline dejanm  Austria
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Quote:
Originally Posted by Salas View Post
10mF I guess he meant. 4700uF is a good mid value.
Sorry for late reply ... Yes I meant 10mF. 4700 uF looks good. Thanks Salas (and AndrewT) once again ...
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Old 6th May 2012, 09:37 AM   #5016
RCruz is offline RCruz  Switzerland
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My final draft..... Now just need a tip on where to find a good fr4 eurocard to do the p2p.
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Old 6th May 2012, 10:55 AM   #5017
AndrewT is offline AndrewT  Scotland
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Salas,
C3, should it be across the output terminals or should it be across the Drain and Source PINs of the Shunt FET?
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Old 6th May 2012, 12:18 PM   #5018
RCruz is offline RCruz  Switzerland
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You are right Andrew... back to the sketch
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Old 6th May 2012, 01:04 PM   #5019
RCruz is offline RCruz  Switzerland
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Here it is
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Old 6th May 2012, 01:29 PM   #5020
AndrewT is offline AndrewT  Scotland
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No, I am not right.
I am asking Salas, where should the cap C3 be?
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