• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Rainbow LED Specs.

Status
Not open for further replies.

tcmtech

Banned
Most Helpful Member
This is a simple one but yet I have never has the chance to test myself.

Can rainbow LED's be run in series like normal LED's? I do not have any to test on myself. The specs I have read say 3 -3.8 volts on average. Does the voltage drop across them change with the colors? Or is it constant?

My niece wants a "cool looking anything" built by here favorite uncle.
I thought I would do up a custom brushed stainless steel sheet with her name in it with all small rainbow LED's. Give it a sort of twinkle effect.

Just not sure if I can run the LEDS in several series sets or if they will all have to be in parallel.

Just curious.
 

audioguru

Well-Known Member
Most Helpful Member
I have some rainbow LEDs that dim before changing colors and the current also dims.
Other rainbow LEDs do not dim and the current is almost constant.

I would never connect the first ones in series. Maybe the second ones.
Use a current-limiting resistor.
 

tcmtech

Banned
Most Helpful Member
Super! thanks! I will just have to test them out when I get them.
 

Sceadwian

Banned
Don't those automatic colour changing ones have built in resistors?
 

audioguru

Well-Known Member
Most Helpful Member
Don't those automatic colour changing ones have built in resistors?
They have a chip inside but I have never seen curves of voltage vs current on a datasheet. They say to use 3V to 3.6V but I use a 270 ohm series resistor from a 9V battery.
 

Hero999

Banned
Is thee a limit to the maximum voltage you can connect them to?
 

Sceadwian

Banned
If they have built in resistors, the ones you add are only to bring the LED back into voltage compliance from an out of range supply.
 
Status
Not open for further replies.

EE World Online Articles

Loading

 
Top