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Old 28th March 2013, 05:04 PM   #1941
PMA is offline PMA  Europe
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Quote:
Originally Posted by studiostevus View Post
Alright, after realizing I read the datasheet wrongly, I also realized that the pinouts of the 2sk170 are different from the j310. So I bent the legs of the 2sk170, and indeed now there is a 'realistic' Vgs.
Genuine 2SK170 is a symmetrical part. That means, if you swap D and S, nothing happens. Neither Idss nor Vgs would differ. Of course, you have to keep Gate (middle pin).
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Old 28th March 2013, 09:05 PM   #1942
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Here we are:
Click the image to open in full size.
...almost,
Karfreitag will proof...
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Old 29th March 2013, 05:08 AM   #1943
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Originally Posted by FdW View Post
So the currents are 783 and 843 mA, that is fine and verifies that the shunt is operating nicely. Also the CCS must be operating, otherwise there would be no 18V or the thing (heat sink) would be cooking.

First suspect should be the CVS (where the external power enters the PSU). If possible replace Q104/204 (BC337/327) with lower gain versions (say Hfe 300 or less) also replace R100/200 with 68 Ohm or parallel the 330 with 100 Ohm and see what happens if this does not help let me know.

(p.s. I will not be able to answer until tomorrow morning )
Changing q104/204 to hfe of 460 worked (original hfe of 460 and 560)! Seems that there are no more oscillations on that board!

When I tried the same trick on the other board, which suffered from similar frequency oscillations, it did not work, still oscillating. Note that I am still using j310 instead of 2sk170 for the njf. Will try tonight what happens if I also replace the njf....
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Old 29th March 2013, 11:26 AM   #1944
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The final word on this:

-Q104/204 is a bit hit and miss. I ended up with both around Hfe=460, although it is not a sure thing it will work with that value (I tried multiple with similar Hfe and some gave oscillation and some not)

-I had to remove the caps across Q104 and Q204 (see assembly guide), otherwise it wouldn't work.

-I had to KEEP the caps across Q102 and Q202 (2.7n, I used 2.2n), otherwise it didn't work.
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Old 29th March 2013, 12:15 PM   #1945
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Have anyone tried to measure the Talema coils? I have 4 and they are from 73-76mH. Dont know if it has any significance though
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Old 29th March 2013, 12:15 PM   #1946
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Quote:
Originally Posted by studiostevus View Post
The final word on this:

-Q104/204 is a bit hit and miss. I ended up with both around Hfe=460, although it is not a sure thing it will work with that value (I tried multiple with similar Hfe and some gave oscillation and some not)

-I had to remove the caps across Q104 and Q204 (see assembly guide), otherwise it wouldn't work.

-I had to KEEP the caps across Q102 and Q202 (2.7n, I used 2.2n), otherwise it didn't work.
Many, many thanks for your effort and report We gained lots of useful information, now I have to cookup (the spell checker objects to cookup but offers, as an alternative, the same with one 'o'. You can guess what I am objecting to) something for the builders guide.
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Old 29th March 2013, 12:18 PM   #1947
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They remove only RF noise so the value is uncritical.
You may measure less then they actually have ( 100mH ) because they are optimized for high frequencies. Your meter may measure at a lower frequency.
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Old 29th March 2013, 12:30 PM   #1948
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Ok. Thanks
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Old 29th March 2013, 12:31 PM   #1949
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Originally Posted by FdW View Post
Many, many thanks for your effort and report We gained lots of useful information, now I have to cookup (the spell checker objects to cookup but offers, as an alternative, the same with one 'o'. You can guess what I am objecting to) something for the builders guide.
Nope, thank you for your help in getting my boards to work!
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Old 30th March 2013, 08:38 AM   #1950
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