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i was going to use a 9v for the convienace of it's size and no need for a larg battery clip. what i'm trying to make is a flashing light device for wearing when i run at night. i woould rather build one then pay $20 - $35 for one. of course my version of such a device will probably be twice as large and more combersome than the store bought version.zachtheterrible said:if the forward voltage on the LEDs is 2-3 volts, y not just use some 2 AA or AAA batteries? they'll last waaaay longer 2.
jrz126 said:It isn't good to put leds in parallel with one current limiting resistor.
Due to the variance while manufacturing, some properties of the leds are different, so one LED could get more current than the rest and burn out quicker.
I'm not saying that it wont work, but if your leds burn out kinda often, this is probably why.
diroga said:so i should put a resistor on each LED insted of having just one?
diroga said:so i should put a resistor on each LED insted of having just one?
Nope. A white LED is a blue one with a yellowish phosphor. They don't appear very white, right? But you can buy RGB LEDs for pixel screens and stuff. I don't think they will ever have a true white LED because white is wideband and LEDs are very narrowband.Juglenaut said:White is actually a LED that emits RGB at the same time, an actuall white single emitting diode is still not on the market.
Sorry, nope again. Purple is radiation at a frequency between blue and UV (remember learning about a rainbow?). Your eye or brain gets tricked when colours are combined. They now make LEDs operate at the extremely high frequency of UV, so purple (maybe called violet) should be easy.A purple LED would emit a mix of RB.