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  • Xenobius's Avatar
    12th September 2019, 06:08
    Yes 700mA is the max of the LED so I could do a 2R and that will take the current down to 0.625A with a 5% tolerance the range will be from 0.595A up...
    45 replies | 1332 view(s)
  • Xenobius's Avatar
    11th September 2019, 20:18
    Ok so we are talking 20 of these circuits should do the trick. Assuming the 30VDC are clean, I should have 1.25v across R1, I should have any voltage...
    45 replies | 1332 view(s)
  • Xenobius's Avatar
    11th September 2019, 14:06
    Yes I get 'excited' too when I think about cooling but really my plan is based on another similar project of someone who already did it using 1W...
    45 replies | 1332 view(s)
  • Xenobius's Avatar
    11th September 2019, 09:53
    AHA that was the last bit I did not understand. Thanks very much Klaus so its possible! 1 or 2w is nothing. I was wrong thinking it was the complete...
    45 replies | 1332 view(s)
  • Xenobius's Avatar
    11th September 2019, 06:34
    Hi again, so a quick recap about the circuit, I bought the 140x leds with a forward voltage of 3.2v - 3.6v and a current of 700ma. There will be 70...
    45 replies | 1332 view(s)
  • Xenobius's Avatar
    31st August 2019, 08:50
    Hi volker, Yes I did however I estimate for 140x leds I will need around 7 (not to mention that one string of 20 leds will be half on the bottom...
    45 replies | 1332 view(s)
  • Xenobius's Avatar
    31st August 2019, 07:28
    Hi, Ok so I've been looking around and so far its not easy to get a constant current driver capable of taking more then 60v input though I did find...
    45 replies | 1332 view(s)
  • Xenobius's Avatar
    31st August 2019, 06:22
    This is really informative. I think if the voltage was around 230v I could just use a bridge rectifier and smoothing caps and work with mains,...
    45 replies | 1332 view(s)
  • Xenobius's Avatar
    30th August 2019, 21:07
    Hi, no objection at all. Im learning before I dive in. Wouldn't the pcb heat up a lot at 3 watts each? If I had to do all 70 in series, what...
    45 replies | 1332 view(s)
  • Xenobius's Avatar
    30th August 2019, 17:10
    So would you say a constant current circuit would solve the problem of cheap leds? Ie: A circuit which allows 650mA to pass through to 7 or 14 LEDs...
    45 replies | 1332 view(s)
  • Xenobius's Avatar
    30th August 2019, 12:26
    @Klaus - Hmm this is really interesting. I knew common LEDs worked with current but I assumed these were different. What I didn't realise was that...
    45 replies | 1332 view(s)
  • Xenobius's Avatar
    30th August 2019, 06:11
    Hello Audioguru, Yes Arctic silver has this product which you can mix and it hardens. In fact you can even find another solution by arctic silver...
    45 replies | 1332 view(s)
  • Xenobius's Avatar
    29th August 2019, 20:22
    Yeah 3W you might be right. I was thinking an A4 sized PCB with 10x rows of 7 leds spaced 3cm apart and "assuming" the PCB would be enough for 45...
    45 replies | 1332 view(s)
  • Xenobius's Avatar
    29th August 2019, 12:24
    All of a sudden this is getting a bit complex for my knowledge. I will try to make sense of this when I am more quiet and will post my findings....
    45 replies | 1332 view(s)
  • Xenobius's Avatar
    29th August 2019, 10:27
    So the LEDs are 3W, 370nm UV light they will cost around 100eur within budget for this project. I've been using florescent tubes for 19 years now and...
    45 replies | 1332 view(s)
  • Xenobius's Avatar
    29th August 2019, 09:34
    Hi, this is a question about driving 140x LEDs which are rated from 3.2 to 3.6v and upto 700mA current (link for them here) My design: I was...
    45 replies | 1332 view(s)
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