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Old 21st December 2011, 09:45 PM   #521
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I forgot to mention, these 2SK146 are BL grade (8-16 mA Idss according to datasheet).
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Old 22nd December 2011, 04:28 AM   #522
EUVL is offline EUVL  Europe
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If you make your own PCB, yes.
The pinout of the 2SK146 would have a real hard time fitting onto my PCB.




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Old 22nd December 2011, 09:38 PM   #523
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Well, with so little parts, I might as well do it without PCB.

Thanks for replies.
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Old 2nd January 2012, 10:36 PM   #524
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Well, I've built it. The actual SEN is only one tenth of the PCB , the rest are two shunt regulators. I used two separate transformers, and I was having trouble with large amounts of hum, buzz, distorsion, etc., but that was solved after adding of 100R resistors on gates going to the ground (thanks for the tip )

I still have some "buzz" on higher volume levels, but I thing that the problem is with close proximity of transformers, I will rearrange them. It is sounding good so far, the voltage on regulators is 17.5 V, I will experiment with higher voltages, for with these transformers I can go as high as 21 V regulated.

Thanks again for everything
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Old 2nd January 2012, 10:43 PM   #525
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Ah, once again I forgot to write something.
This is off course only one SEN PCB made for personal use. I do not intend to "manufacture" it or anything like it. It's not even a "real" PCB actualy, I just drilled some more holes in spare space of the shunt PCB and connected the JFETs with wires
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Old 3rd January 2012, 05:41 AM   #526
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Yes, for such a simple circuit it is really totally viable to do P2P without a PCB.
And I would encourage anyone to try this even on a breadboard.

Suggest you now try to play with passive components, especially R_iv and C_iv.
Don't waste those FETs.




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Old 3rd January 2012, 05:42 AM   #527
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BTW your SEN circuit is too close to the regulator for my liking.
If you were to do another PCB again, try to separate the two with 5~10mm space.

Just gut feeling, no scientific proof.


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Old 3rd January 2012, 08:14 AM   #528
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really? is it simply because its low level analogue? because normally the closer the better, as you well know.
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Old 3rd January 2012, 10:27 AM   #529
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It's because everything including the power supply is floating.


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Old 3rd January 2012, 03:27 PM   #530
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Starting to look at this project again.
Please remind me: Do the SK170's need mathcing of both IDSS and VGS or just IDSS?

Thanks
Ryan
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