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Old 24th February 2013, 06:58 AM   #1361
EUVL is offline EUVL  Europe
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I was up at 5:00 this morning. And earlier weekdays.




Enjoy your stay,
Patrick
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Old 1st March 2013, 02:28 PM   #1362
Bemused is offline Bemused  United Kingdom
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Originally Posted by EUVL View Post
I was up at 5:00 this morning. And earlier weekdays.




Enjoy your stay,
Patrick
Oh boy Patrick, your an expert with electronics but I sure could help you out with that nasty early rising.
The hour of rising is directly proportional to the square of alcohol volume consumed the night before

Will eventually get the Sens in full differential audio next week btw
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Old 1st March 2013, 03:07 PM   #1363
EUVL is offline EUVL  Europe
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4am is the best time for innovation.


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Old 1st March 2013, 04:55 PM   #1364
bcarso is offline bcarso  United States
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Oh boy Patrick, your an expert with electronics but I sure could help you out with that nasty early rising.
The hour of rising is directly proportional to the square of alcohol volume consumed the night before

Will eventually get the Sens in full differential audio next week btw
Well although I may not stay up thereafter, I find my own body works differently, more of a reciprocal to the square of ethanol consumed, after a constant is added of order three hours.

It can be useful though to be able to respond to e mail in the earliest morning, giving clients the illusion that one is up continuously.
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Old 2nd March 2013, 10:50 PM   #1365
smms73 is offline smms73  Portugal
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what you guys think about the 2sk715 from sanyo to substitute the 2sk170 ?
It has higher forward transfer admittance (50mS), and lower gate drain capacitance (3pf). And is also low noise.

http://www.onsemi.com/pub_link/Collateral/EN2543-D.PDF
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Old 2nd March 2013, 11:18 PM   #1366
bcarso is offline bcarso  United States
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what you guys think about the 2sk715 from sanyo to substitute the 2sk170 ?
It has higher forward transfer admittance (50mS), and lower gate drain capacitance (3pf). And is also low noise.

http://www.onsemi.com/pub_link/Collateral/EN2543-D.PDF
That looks like a nice part, similar to the BF862 but in through-hole. Low voltage however, so that requires some care.
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Old 3rd March 2013, 04:36 AM   #1367
EUVL is offline EUVL  Europe
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Essentially a BF862 in different package, and cost quite a bit more ....


Patrick
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Old 3rd March 2013, 09:25 AM   #1368
smms73 is offline smms73  Portugal
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2sk932 is the smd version of 2sk715 and is cheaper.
BF862 has very good characteristics, and higher Vds (20v).

Patrick I am doing some tests with your circuit ( CEN ) , I think it can be very good solution for PCM1794 as this type of DAC has very high output impedance.

The major source of distortion of the CEN with this type of DACs is the gate to drain non linear capacitance of the Jfets, I am trying to come up with a simple solution that do not add much complexity and maintain the excellent stability of your circuit.
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Old 3rd March 2013, 10:23 AM   #1369
EUVL is offline EUVL  Europe
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The distortion mechanism has been discussed in some detail in my article which you can download (free) from Jan Didden's Linear Audio website.
The easiest way to reduce non linear capacitance is to use SEN with BF862, cascoded with J111.
In Spice simulation, the distortion is as low as -120dB or thereabouts.
But the distortion even in the original SEN is very very low, that you may not hear any difference. More an intellectual challenge.
And cascoding thus make it more prone to oscillation.

Try it out in Spice for yourself.


Patrick
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Old 3rd March 2013, 10:24 AM   #1370
smms73 is offline smms73  Portugal
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This is what I have for now. The stage based on 2n4416 act as a buffer between the gate non linear currents of the input Jfet (2sk170 , 2sj74) and the ground.
With a infinite output impedance source the distortion is near zero, with the same conditions the normal CEN have 0.005% because of the Crss non linearities.

The distortion with a input impedance of 200K , 8ma p-p and 6 Volts P-P output is 0.00002%.

I am looking for a substitute for the 2n4416.
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