Hi Werner, Since I think that we need to use same part as possible, we had have Q1 Q2 2N7002MTF, See Q3 with D1 in circuit: http://downloads.qi-hardware.com/people/adam/m1/tmp/m1r4/Misc_led_20120202.pdf
I did an experiment with 120 Ohm and 560 Ohm as you described in #milkymist for experiment. If I misunderstood your idea, correct me. ;-) 1). R41 = 120 Ohm D1 is fully ON, If = Ids = 9.67mA when I simulated LED_PWR net(i.e. gate pin of Q3) to connect 3.3V net [ simulated a pullup ] D2 is fully OFF, If = 0 uA, with letting LED_PWR to touch GND [ a pulldown ] 2). R41 = 560 Ohm D1 ON, If = Ids = 2.446mA, 3.3V on gate pin [ a pullup ] D1 OFF, 0 uA [ a pulldown ] 3). PWM test, don't know how to test it since my current weakness on f/w. 4). off-ledm, R42 drew with a 560 Ohm. Since reset status, fpga pin can be pullup, so i assumed that D1 will still be fully ON to show DC jack power coming. It's good for me to know if this circuit works well from power directly before porting any f/w when in manufacturing. According to the definition of LEDs thread: http://lists.milkymist.org/pipermail/devel-milkymist.org/2012-January/002651.html dark --> no power/disabl , do you know which current pulled out fpga pin that I can try it to simnulate a real 'connection' on it? lit --> power/enabled, from result of N-MOSFET circuit, not lit but can be fully ON, but how luminous intensityit will? you can use PWM to get. Since I used a green led (KP-1608SGC) which is same as rc3, so I can't visually look about as how similar apparent brightness is same at the others as current Werner's red LTST-C190KRK. so I think that I need to detemine R41 value from your current flow of LTST-C190KRK (off-ledm circuit example from circuit R42 you there), then I fine trun same current with resistance (my site here) to get an expected brightness. How do you think? for off-ledm, two leds D1 [DC-in] and D2 [Booted], according chat in irc, I drew them for: a). on-ledm, R200 ~ R203 marks as 270 Ohm b). off-ledm, R41, TBD c). off-ledm, R42, 560 Ohm Thanks, - adam
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