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  1. pier1

    white led

    You asked me " can u get one " U asked me wheather can i get LM10 at my place ? Or can i get the circuit ? If it is the circuit u should help me ? I cant design perfectly. I request u to please send me a schematic of the sensing .
  2. pier1

    white led

    Yes AG I can get them .    
  3. pier1

    white led

    hi AG         Sorry I was a bit late . Could you send me a small schematic for the comparator . I tried and am not able to design it . Please help me . Thanks Pier Francis
  4. pier1

    white led

    st13005 (to220) is available in my country . how about this ?
  5. pier1

    white led

    Hi AG ,           Thanks a lot for the suggestion , could You sugest me which transistor would be good to use . Thanks Pier .
  6. pier1

    white led

    i'm sorry i made a mistake , it is for the led's to switch off when the voltage rises above 250 volts ac . Pier
  7. pier1

    white led

    Hi AG         Hows this arrangement for the led's to switch when the voltage rise above 250 volts AC . Please tell me if this needs correction ? Pier
  8. pier1

    white led

    yes , but none of the led's have failed yet .
  9. pier1

    white led

    hi AG The brightness varies about twice or thrice in some time .
  10. pier1

    white led

    Hi AG         The project is fine now, working and having enough brightness, but for the resistor i put 10k 20watt , it is running cooler now . Thanks for the help . I am making the housing for it now .  Thanks Pier .
  11. pier1

    white led

    Hey AG           I am going to follow your idea of 70 volt i.e, 20 in series . But i need an arrangement to disable mains when the voltage shoots above 240 or 250 . Some one said that there is some special Ic for this purpose . do u have any arrangement for this ? Thanks Pier
  12. pier1

    white led

    Thanks AG                 I will do it , But as the total led current is 625mA will transformer withstand ? ( 500mA)
  13. pier1

    white led

    Hi AG         Thats a good idea, but will if one led blows off then the entire ckt wont work naa . I thought of another arrangement  i.e, individual resistors (smd) .          (324 - 3.5 )/25mA = 12.8 k for each led . Please go through this ckt AG and let me know if there is any mistakes . I...
  14. pier1

    white led

    Hi AG         Actually i want to reduce the cost and it is for roof lighting . Is there any other method that i can do because I really want to reduce the cost . the transformer here is very costly and you wont get that correct rating mentioned on it and as you know the indian market . they are...
  15. pier1

    white led

    Hi AG         I found the adapter to be too expensive so i decided for an alternative one . the LED ckt draws only a max of 625mA so i decided for the ckt shown in here . I used a 2 amps bridge and a voltage divider followed by a regulator so what will be the wattage of the resistor to be used...
  16. pier1

    white led

    Hi AG         As you asked the voltage is regulated . It is a switchig adapter , but i dont know the forward voltage or the continious rating of the led cause there are different brands coming to India and to my surprise some shopkeepers also dosen't know it . They will only be interested to...
  17. pier1

    white led

    Hi  AG         Is this the way u told me to conect ?  If so what should be the value of the resistor ? I guess it is 200 ohms . I am planning of using surface mount devices for this can i use resistors of 1206 package to solve the issue ? Thanks Pier .
  18. pier1

    white led

    are any IC's available for this application ?
  19. pier1

    white led

    Audio guru is right . The led draws a max 0f 30mA . I want to power it from a 6 volt AC - DC adapter . The led's are to be in continious on state and should give very long life . I want to arrange it as a small roof lighting . 
  20. pier1

    white led

    i need a circuit to drive 20 white led's of 5mm size . Can anyone help me ?
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