Power supply for 300 LED from AC

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Well where is the circuit diagram ? Any1 post it pls...

The circuit is for White LED of 3.5v approx.


60 White bright LED in series.
 
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Which would be great if we were discussing pilot lights.

We were discussing large quantities of junk LEDs run of the line. My point is that you can pay $50 to get "junk" whites to put out 500Lm for 20W or you can pay $25 to get lighting class LEDs to put out 500Lm for 5W.

Which would you rather?
 
ketankhakhar said:
please give me an idea and circuit diagram of the same
Click to expand...
read the thread.... driving LEDs off the mains like that is inefficient in power and build time...as well as being prone to failure in long term service.

a little more power supply complexity gets a lot more light out of a only a few lighting class LEDs
 
Upananda said:
Dear sir

please show me the power supply for 60 LED from AC

Thanks
Upananda
Click to expand...

are you saying that you have hundreds of junk LEDs that you are just dying to use?

the best non lighting class LEDs are probably CREE P41s: Digi-Key - CP41B-WES-CK0P0154-ND (Manufacturer - CP41B-WES-CK0P0154) at $0.50 each and 74Lm/W. For 60 LEDs that would be 444Lm typical or about a 40W bulb for $30 without the driver.

Two **broken link removed** and one **broken link removed** for about $16 plus a good heat sink is a lot less money and labor for your light
 
why using a transformer just see how chritmas led light are made, they are no transformer, no extra parts at all, just leds in series and maybe a capacitor or resistor. i would do it very easily, one bridge rectifer and one resistor per branch of led.
 

and they have to run at half capacity to make sure they do not burn out with voltage variation
 
Here is the basic schematic of the circuits I have been building and have had several of them running continuously now for about 6 -7 years now.
You will have to calculate the voltages and values for the two capacitors and R1 can be any where from 100 to 1K ohms.

 
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