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Old 14th September 2013, 07:39 PM   #2851
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Join Date: Mar 2012
Location: Ireland
Quote:
Originally Posted by miepa View Post
hi, a question about matching
SK170
J113
J310

i would go with a 9 volt batterie (no powersupply in the house) and a DC voltmeter. Connect the +V to the Drain, connect the Gate and Source together to a 100 ohm resistor, and connect the other lead of the resistor to ground.

i measure the voltage across the resistor, which gives the Idss.
1 volt = 10 mA of current.

1) is this correct?
2) i can use this matching situation for all those 3 N-Fets, right?
3) is it normal to get around 3V with the J310?
4) what values would be perfect working with
SK170
J113
J310

THANK YOU VERY MUCH!!!!!
Hi miepa
So is it right for your JFet,s

Click the image to open in full size.
Click the image to open in full size.

Take care
Werner
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Old 14th September 2013, 08:14 PM   #2852
miepa is offline miepa  Austria
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and what is the appropriate value to use in the paradise?

SK170 - idss 6.6-6.9mA
J113 - VGS 2.2 ?
J310 - VGS 3.2 ?

and is it a problem if i use on one board two J113 with VGS 2.2 and on the other board two J113 with VGS 1.9 ?
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Old 14th September 2013, 10:20 PM   #2853
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Quote:
Originally Posted by miepa View Post
and what is the appropriate value to use in the paradise?

SK170 - idss 6.6-6.9mA
J113 - VGS 2.2 ?
J310 - VGS 3.2 ?

and is it a problem if i use on one board two J113 with VGS 2.2 and on the other board two J113 with VGS 1.9 ?

I don.t know is the my answer. I have balanced only BC 327 , BC337 and
the Calvin Buffer Transen.
I have checked, because I had in early times problems, the 2SK170
and they have in my build Idss 8,5mA.
My paradise sounds super fantastic in my last set up.
Tahe it easy
Werner
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Old 15th September 2013, 04:34 PM   #2854
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
if you use a 9V battery and drop 3V across the measuring resistor then the Vds is ~6V.
Idss is the current when Vds=10V for most datasheets.
As you reduce the Vds the Id will change and with some devices it will change a lot.
Use a 10r measuring resistor to get closer to your 10Vds and use an adjustable regulated power supply and adjust the output so that 10Vds is maintained during measurement.
Note also that Tj=25degC for Idss. If you cannot maintain that 25degC then you have not measured Idss.
The best you can do is try to compare different devices and try to maintain constant P in the device during comparison.
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Old 15th September 2013, 09:39 PM   #2855
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Join Date: Mar 2012
Location: Ireland
Hi Lads
Two Links about Jfet matsching

1. Original Link in english:
W7ZOI *JFet Biasing Tutorial

2. The same article or item in german:
JFET-Arbeitspunkteinstellung

Take care Werner
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Old 16th September 2013, 07:19 PM   #2856
miepa is offline miepa  Austria
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Join Date: Aug 2012
i`m thinking about the Q104 and Q204
what would be the better choice

Vishay MKT1817 1F/63V
or
Nichicon BG 1F/50V Bi-Polar
??

THANK YOU!
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Old 19th September 2013, 09:49 AM   #2857
hesener is offline hesener  Germany
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Location: Munich, Germany
No big difference. I would (and did) use Wima FKP2, I believe, but any decent foilcap will do.
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Paradise documents are here: Link list
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Old 19th September 2013, 06:08 PM   #2858
RCruz is offline RCruz  Switzerland
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Can I use a good quality, low ESR cap for C105 C205 shunt termination cap whithout fear of oscillations ?
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Old 19th September 2013, 06:27 PM   #2859
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by RCruz View Post
Can I use a good quality, low ESR cap for C105 C205 shunt termination cap whithout fear of oscillations ?
The standing advice 'High' ESR, e.g. a normal elcap, at this position a low-ESR boutique device is not going to help anything.
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Old 19th September 2013, 06:33 PM   #2860
RCruz is offline RCruz  Switzerland
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Ok... thank you Frans.... maybe a zobel would work
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