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Old 14th December 2012, 10:28 AM   #41
EUVL is offline EUVL  Europe
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Part 2 on active devices, as promised.
Here a new pdf to combine both Part 1 & 2.


Enjoy,
Patrick

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File Type: pdf F5XP Public Part 1&2 121214.pdf (430.6 KB, 672 views)
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Old 14th December 2012, 05:40 PM   #42
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Patrick, thanks for sharing. Just like the input devices, make some allowance of alternative output devices, including the Toshiba 2013/313 pair. Thanks.
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Old 14th December 2012, 06:29 PM   #43
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Patrick,

Renesas 2SJ 76/77/78/79 and 2SK 213/214/215/216 are announced EOL

do you have any idea where there might be some genuine ones still ?

Fakes abound as usual.
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Old 15th December 2012, 02:24 AM   #44
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If the plan is to offer both matched input and output FETs to case/project subscribers, I have a feeling that Patrick has already secured a nice stash of 2SK214/2SJ77's.
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Old 15th December 2012, 03:48 AM   #45
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Yes, we have enough genuine, tested devices to support at least 2 batches of this project, if not more.
They were unfortunately not too cheap. Purchase price was already ~4€ apiece.

We have very limited 2SK2013/2SJ313, and they are not pin compatible.
So it will need a new PCB and can only be supported as a limited option for those who desperately want to experiment.
Unless Mr. Zhou answers his email, whenever .....

We are also searching for other devices which are better complementaries than the above two.
But this will take time. So even if successful, it will come a year later as potential upgrades.

Default will be Renesas laterals.


Patrick
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Last edited by EUVL; 15th December 2012 at 03:54 AM.
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Old 24th December 2012, 06:18 AM   #46
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Some more reading material for Christmas.


Merry Christmas & Happy New Year,
Patrick

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File Type: pdf F5XP Public Part 3 121224.pdf (375.1 KB, 484 views)
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Old 24th December 2012, 07:57 AM   #47
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Thank you Patrick,

my first christmas present this year!

One remark concerning the attenuator. -48dB seems not to be very much. Ive got a bit over -60dB at the moment (from a X-BOSOZ with Gain 3.9x) and in some combinations (Zu Druid, NCore400) this is only just enough.

cheers,

William
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Old 24th December 2012, 08:03 AM   #48
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Pleasure.


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Old 24th December 2012, 08:47 AM   #49
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Re attenuation :

You can always change the values by dividing the shunt resistor further by 2, or 4, or ....
You total range remains the same, limited by the 8 bit relays.
Or you can step them by a factor of 3, like 30k, 10k, 3,3k, 1k, 330R, 100R, 33R, 11R.
Then you will get -65dB.
Will need a different look-up table, but not impossible.


Patrick
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Old 24th December 2012, 09:06 AM   #50
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That's fine. Maybe I can even use my programmer again......

William
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