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Old 6th September 2012, 07:09 AM   #281
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Every measurements of the board are OK and the first transistor checks as well

I will mount it with isolated holders in the case now.

Thank you all for the assistance.

Andreas
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Old 18th September 2012, 04:25 PM   #282
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Hi all,
One question about PNP/NPN HFE graphs...
I must be missing something, But the NPN curve works backwards for some reason..
What is the referance for the HFE ?? it is declining
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File Type: jpg PNP_NPN.jpg (530.7 KB, 483 views)
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Old 19th September 2012, 01:49 AM   #283
locky_z is offline locky_z  China
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Quote:
Originally Posted by BenY View Post
Hi all,
One question about PNP/NPN HFE graphs...
I must be missing something, But the NPN curve works backwards for some reason..
What is the referance for the HFE ?? it is declining
You need to checked once 'Calibration before measure' checkbox
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Old 20th December 2012, 08:22 AM   #284
jeepy is offline jeepy  Switzerland
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Quote:
Originally Posted by locky_z View Post
You need to checked once 'Calibration before measure' checkbox
Board received!
Would this simple PSU with a lm317 + TIP 2955 be ok?
Thanks alot!
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File Type: gif RegulatedPS.GIF (3.8 KB, 274 views)
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Old 20th December 2012, 12:02 PM   #285
locky_z is offline locky_z  China
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Quote:
Originally Posted by jeepy View Post
Board received!
Would this simple PSU with a lm317 + TIP 2955 be ok?
Thanks alot!
Yes,you can use any regulator PSU.
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Old 26th December 2012, 11:34 AM   #286
CeeVee is offline CeeVee  Portugal
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Default Nmos and Pmos don't agree

Hi Locky_Z,

I have a problem reading the transfer curve in Pmos ( 2SJ201 ).

In similar conditions i get the complementary Nmos ( 2SK1530 ) perfect but cannot get the Pmos.

Any idea why ?

The images of both are included, with settings for ver 3.5 of software.

In the 2SK1530 plot you can see the 2SJ201 plot up to where it stops at 1.6V Vgs

Edit: the transistors are genuine !
Attached Images
File Type: jpg 2SJ201.jpg (254.2 KB, 224 views)
File Type: jpg 2SK1530.jpg (266.2 KB, 206 views)

Last edited by CeeVee; 26th December 2012 at 11:37 AM.
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Old 27th December 2012, 12:03 AM   #287
locky_z is offline locky_z  China
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Can you send me the save data file(.cuv).
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Old 27th December 2012, 09:19 AM   #288
CeeVee is offline CeeVee  Portugal
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Hi Locky_z,

Here is the cuv file with a 2SJ201 and a 2SK1530, i tested a few dozen of each and they all show same disparity.

I used lots from diferent sources, Zhou-fang, Audiophonics and from other forum members including a mached NNNNPPPP set for my forthcoming F5X which i know is very well matched.

Really would like to get the most out of your great board.

Regards,

Carlos
Attached Files
File Type: zip For Locky.zip (2.1 KB, 17 views)
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Old 27th December 2012, 12:15 PM   #289
locky_z is offline locky_z  China
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Your power supply capacity is insufficient, or something wrong with E-channel amplifier source current.

From the P 2SJ201 Vgs->Id-1 data, you look at 'Ve' column, the 'Ve' is E channel amp output voltage.

At begining, 'Ve' is 28.3V, and when current Id increases, the 'Ve' decrease.
When Ve change more than 2V,The system considers Ve not stable, so it interrupted measurement.



Because measure P type,the E channel will setup to output high voltage and source current.
Click the image to open in full size.
If power supply capacity is insufficient or the Q3(NPN) of E channel amp have wrong, the E channel output voltage can not keep stable.
please check the Q3(NPN) on the board.
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File Type: png a1.PNG (6.5 KB, 228 views)
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Old 28th December 2012, 09:28 AM   #290
CeeVee is offline CeeVee  Portugal
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Thanks Locky_z,

I tried my lab supply ( 30V 6A ) instead of the HP (30v 2500mA ) one and result is the same so it's not lack of PSU current capacity,
will check Q3, right now it has the Tip132 you fitted.

Last edited by CeeVee; 28th December 2012 at 09:41 AM.
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