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Posts posted by pier
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Yes AG I can get them .
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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 -
st13005 (to220) is available in my country . how about this ?
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Hi AG ,
Thanks a lot for the suggestion , could You sugest me which transistor would be good to use .
Thanks
Pier . -
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 -
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yes , but none of the led's have failed yet .
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hi AG
The brightness varies about twice or thrice in some time . -
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 . -
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 -
Thanks AG
I will do it , But as the total led current is 625mA will transformer withstand ? ( 500mA) -
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 am new to electronics AG that is why i am asking a lot of doubts . -
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 stingy and their products are a junk . so i am trying it out to really reduce the cost . please advice me on this .
Thanks
Pier -
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 for both in the divider ?
Thanks
Pier -
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 give you the details only if you purchase the devices in a lot ( production ) . All that I know is that it is a white led of 5mm . Is there any website to which I can look into ?
Thanks
Pier . -
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are any IC's available for this application ?
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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 .
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i need a circuit to drive 20 white led's of 5mm size . Can anyone help me ?
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thanks , i'll try it out .
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could i use BC547 & BC557 instead of those transistors in your link u gave me ?
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thanks Audio guru
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I dont know anything in programming and want to make the RGB project in the site's home page . without learing the actual thing , is there any way to just do it for one time for an intrest .
thanks and regards .
Pier francis . -
My parallel port is not working . some one said that it is blown off and another said try change the mother board .
Could you suggest me to check what is the actual problem
Regards
Pier Francis
white led
in Electronic Projects Design/Ideas
Posted
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 .