dear all
i need full diagram circuits for 90 led's sheet led's 5 mm blue and white and power supply 12 v

many thanks

 

Here you go. Enjoy!
http://alldatasheet.com/

 

no things please advice

any help please

 

How can we help if we do not know anything about what you want. It's like saying, build me a car!

 

need help to define all part for circuits

 

You're not making any sense. I am guessing you are not a native English speaker. In that case, I suggest you try translate.google.com. It might help you to better explain what you want, and help us to better understand you.

Matt

 

You have to tell us more about the LED. How many are blue and how many are white. How much current and voltage is required for each color of your LED......etc

Allen

 

And let's not forget that this is the HOMEWORK Help forum. You need to show what efforts YOU have made to at least attempt a solution for YOUR homework problem.

 

all led's are 3.6 volt 75 mA and power supply 12 volt

 

all led's are 3.6 volt 75 mA and power supply 12 volt

You didn't answer our questions.

 

all led's are 3.6 volt 75 mA and power supply 12 volt

Still waiting to see this "attempt" thing.

 

now i don't need any help

 

Here you go....!

This project will keep you busy.
http://www.jameco.com/Jameco/workshop/JamecoBuilds/8x8x8-led-cube.html
Max.

 

many thanks max

 

now i don't need any help

So, either you figured it out on your own once you decided to make the attemp -- which is a great thing; or you concluded that we weren't going to just do your work for you and gave up -- which is a great thing.

 

If you want to light up the 90 LEDs, then you should doing as this:
12V/3.6V=3.333, 90V/3=30 strings, the power only has 12V, so you only can using 3 LEDs in a string, and then you have to calculate the limited resistor for LED current limitation.

 

dear all
i need full diagram circuits for 90 led's sheet led's 5 mm blue and white and power supply 12 v

many thanks

Don't now what r u doing are u making light system??
anyway just make 4 or 3 led series with series resistance of 100/220ohm 1/4watt as per requirement of intensity.
and then connect all these series in parallel to 12v source...

 

Don't now what r u doing are u making light system??
anyway just make 4 or 3 led series with series resistance of 100/220ohm 1/4watt as per requirement of intensity.
and then connect all these series in parallel to 12v source...

How do you figure that the OP will be able to power 3 LEDs in series if they are using 12 V and each LED has a forward drop of 3.6 V?

At the requested intensity of 75 mA, a 100 Ω resistor will drop 7.5 V and dissipate well over 500 mW while a 220 Ω resistor will drop 16.5V and dissipate nearly 1.25W. So just where did you come up with the recommendation of using "100/220ohm 1/4watt" resistors?

With three LEDs in a string, the voltage that needs to be dropped across the current limiting resistor would be

Vdrop = 12 V - 3 x 3.6 V = 1.2 V

To do this at a current of 75 mA would require a 16 Ω resistor and would dissipate about 90 mW. This may work just fine, but small variations in the forward LED voltage or the supply voltage could move the actual current around by perhaps 50%. If that's acceptable, then this is probably the way to go.

But if the OP needs a more consistent and uniform current, it would probably be better to go to two LEDs in a string, meaning that the resistor would have to drop

Vdrop = 12 V - 2 x 4.6 V = 4.8 V

which would require a 64 Ω resistor (use a 62 Ω if you need it close or a 56 Ω or a 68 Ω if you can be a little loose) capable of dissipating 360 mW. So two 1/4 W 33 Ω resistors in series might be a way to go. With this, it is probably unlikely that the current will vary more than about 10% from the nominal value.

 

OK, if there are 8 Led white in series with 220ohm at 1/2 or 1/4 watt resistor(in paraallel there are more than 1000's led) driving from 26V source is not giving good brightness, increasing voltage to 46V will damage the led?

 

OK, if there are 8 Led white in series with 220ohm at 1/2 or 1/4 watt resistor(in paraallel there are more than 1000's led) driving from 26V source is not giving good brightness, increasing voltage to 46V will damage the led?

What, on Earth, are you rambling about? Who said anything about 8 LEDs in series? Or thousands of LEDs? Or about 26 V sources? Or about 46 V sources?

Are you sure you are in the right thread on the right plane of existence?