I wonder why sellers asked to me to run it on 12v dc, anyways well then what's the alternative and how can I make an array of it , can it be arranged now Sir ?so its a 7V led @ 750 mA, its no use on 12V ,thats why it blows up.
I wonder why sellers asked to me to run it on 12v dc, anyways well then what's the alternative and how can I make an array of it , can it be arranged now Sir ?so its a 7V led @ 750 mA, its no use on 12V ,thats why it blows up.
Yes sir I did,See post #18
Ok the capacitor in series with each LED on positive side, and each LED will go in parallel , and plug it into 5 v dc ? is that what you mean sir ?It looks like you need about 7.5 ohms, 8 watts for each resistor. One resistor for each LED.
It isn't exactly 7.5 ohms, but that's a standard size.
With 5 volts to use up, you might build a current driver from an LM317 but it's been difficult enough to come up with enough information to name one resistor!
Wow, thank you so much sir, and no other part is needed to be added on to this , and also, what is the maximum no. of LEDs I can put into this parallel circuit, with PC power supply of 12v, and also can I mix Parallel and series so as to get maximum, use of the spare amps from the power supply ?if your going to run it with all the leds in series,
then ten leds is 70V , twenty leds is 140V, thirty leds is 210V.
i would use a pc power supply and put a 7 ohms resistor in series with each led, and put them all in parallel across the 12V supply,
ten leds should take 7.5Amp,
twenty leds is 15Amp approx.
What?Ok the capacitor in series with each LED on positive side, and each LED will go in parallel , and plug it into 5 v dc ? is that what you mean sir ?
and to connect the LM317 in what configuration ?
And can I also mount this on transformer that I have converted from 220v ac 5 amp to 12v dc ?no Capacitor, Resistor 7 ohms @5 Watt.
Sorry I confused it with something else, now am clear with the thing, thanks so much for the supportWhat?
Where did 5 volts come from?
How does, "You need a resistor" turn into a capacitor?
How does, "You need a resistor" turn into, "Use an LM317"?
Ok so I plugged in my LEDs with 7 Ohm resistor to the 12v dc, with resistor on the positive side of the led, plugged it on and then after 50 seconds., the resistor smokes up, What did i do wrong ? checked with 10 ohm resistor same it is.It looks like you need about 7.5 ohms, 8 watts for each resistor. One resistor for each LED.
It isn't exactly 7.5 ohms, but that's a standard size.
With 5 volts to use up, you might build a current driver from an LM317 but it's been difficult enough to come up with enough information to name one resistor!
You mean to say that the transformer is putting out 12v AC, and not 12v dc ? and the transformer is made into 12v by connecting a 4700uF condenser and two diodes, is it AC or DC ? I got confused with this .It's remotely possible the LED would run off the 5V rail of the PSU and you might get away with no resistor. It's also possible that two LEDs in series might run off the 12V rail.
Neither of these cases is ideal and neither is likely to use the full power capability of the LEDs, but could work in a pinch. As you've learned, one LED cannot take the full 12V.
Your transformer may put out 12V AC RMS, but that means it is putting out peaks at 16V.
Ok, here I go again .. ! I'll check it back,I told you you need a 5Watt resistor, otherwise it will burn out.
But I guess, that wouldn't be energy efficient ? would it be ? using a 5W resistor.I told you you need a 5Watt resistor, otherwise it will burn out.