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15th October 2012, 01:50 PM
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#1831 |
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diyAudio Member
Join Date: Sep 2009
Location: Catalonia new Europe state
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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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15th October 2012, 02:16 PM
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#1833 |
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diyAudio Member
Join Date: Sep 2009
Location: Catalonia new Europe state
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Tea-Bag can supply you mini-kits.
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16th October 2012, 08:02 AM
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#1834 | |
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diyAudio Member
Join Date: Mar 2009
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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. Quote:
Last edited by janos_904; 16th October 2012 at 08:08 AM. |
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16th October 2012, 09:00 AM
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#1835 |
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diyAudio Chief Moderator
Join Date: Oct 2002
Location: Athens-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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