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Old 15th October 2012, 01:50 PM   #1831
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BiB Manual

"JFETS/IDSS
Toshiba 2SK117GR is used, has shown better stability as a CCS than 2SK170 in this reg
and more bandwidth. The noise is on par with 2SK170 but the capacitance is half. Its -Vp is
also suitable for the small voltage margins in some crucial positions in this design.
By testing a few, 3-5mA IDSS range in the GREEN(GR) group were plenty.
You should select yours for falling in that range also, by following this tutorial:
Transistor matching
There is no need for strict matching, use your lower ones from the 3-5mA subgroup for
Q102,202,302, your medium ones for Q103,203,303, and your stronger ones for
Q105,205,305. Last but not least, 2SK117GR is currently cheaper and more available."

I doubt you get 3mA with BL grade
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Old 15th October 2012, 01:59 PM   #1832
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Ok, Thanks! I found the same question and Salas's answer at #1123.
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Old 15th October 2012, 02:16 PM   #1833
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Tea-Bag can supply you mini-kits.
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Old 16th October 2012, 08:02 AM   #1834
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Thanks, but I have all the stuff in my drawer. In the evening I did find 3 pieces of 2SK117GR too . I built a BIB with IRF9610 and IRF9530, DC=17 V, R101= 9 ohm/5W, 4 blue LEDs. D 101= 1 red LED, R105 trimmer=5Kohm. Output is 12,6 V, and the dummy load= 94 ohm. Unfortunately I can't adjust the output, red led is off :-(. I measured 2,6 V at R101, 4blue=7,9V. Any thoughts? Thanks.

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Tea-Bag can supply you mini-kits.

Last edited by janos_904; 16th October 2012 at 08:08 AM.
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Old 16th October 2012, 09:00 AM   #1835
Salas is offline Salas  Greece
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No or too weak current in the ref from its associated K117 or the red is put in the wrong way blocking? Blue leds can be noisy VS green, then again only 2V per blue, maybe those GRs are too weak? Did you get their idss before installing?
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Old 16th October 2012, 09:10 AM   #1836
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Sorry, I misstyped, 4 Green LEDs =7.9. I did not measure, going to... Is Q103 the Vref associated K117?

Last edited by janos_904; 16th October 2012 at 09:14 AM.
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Old 16th October 2012, 09:34 AM   #1837
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Yes.
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Old 16th October 2012, 09:37 AM   #1838
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Thanks! Will try today.
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Yes.
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Old 16th October 2012, 09:41 AM   #1839
Salas is offline Salas  Greece
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You use a board or is it point to point?
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Old 16th October 2012, 12:52 PM   #1840
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Point to point wired.
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