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Old 8th September 2010, 04:44 PM   #4751
Salas is offline Salas  Greece
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Merlin just do that circuit. Test it with the specific jfets & specific leds or mix 3+diode on a breadboard. Try red leds if you have, first. Use 20V for testing without a 3k3 or 45V with a 3k3. After matched, just copy it in the final builds.
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Old 8th September 2010, 04:58 PM   #4752
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Quote:
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You can either use the 180R as it is and run the leds lower current, or delete it and put a 3k3 1W between B+ and the Led's Jfet to run them higher current. In any case you should test and match them with the jfet of choice feeding them with an 180R or without (fet g&s) if you are to use the 3k3. I would choose the configuration that takes me nearer to the voltage I seek with the particular leds. You use the trimmed down Idss already in your current build.
Now measure 6.04V, it's corrected for the schematic I want to use?
sorry crossed your post with mine post

Last edited by merlin el mago; 8th September 2010 at 05:02 PM.
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Old 8th September 2010, 05:01 PM   #4753
Salas is offline Salas  Greece
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Its not bad but I would prefer around 7V.
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Old 8th September 2010, 06:37 PM   #4754
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What about 7.56V using your last schematic?
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Old 8th September 2010, 06:53 PM   #4755
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Good.
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Old 8th September 2010, 06:58 PM   #4756
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Thank you, now I will match the rest of LEDs for the 3 channels more
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Old 8th September 2010, 09:31 PM   #4757
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Done, I have 4 LEDs string matched each one 7.56V
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Old 9th September 2010, 09:35 AM   #4758
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Question BC550C Idss

@Salas
Wich will be the best Idss value for Q3 BC550C?

I have following Idss:

535
536

558
559

562
563
564
565
566
568

574
575
576
578
579

580
584
588
589

591
598

602
603
606
609

611
616
617
618

624
625

641
642
648

652
656
658

660
669

670
678

680
685
686

I need 4 transistors for 4 channels
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Old 9th September 2010, 09:41 AM   #4759
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Try low Rbb Toshiba etc.
Thanks a lot. Another question, didn't find the Rdson from the SK170 and SK359 in the data sheet, can you provide it to me.
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Old 9th September 2010, 10:15 AM   #4760
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Question 2SK170 Q6 Idss

@Salas
Wich will be the best Idss value for njfet don't matched Q6 2SK170?

Last edited by merlin el mago; 9th September 2010 at 10:23 AM.
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