Questions about LED's???

[James Duncan]

I'd like to change the LED's inside my computer case (from green to blue)
but I'm not sure if its a matter of simply cutting off the old ones and
soldering on the new ones?

I've read that LED's come in different voltages? If this is the case how
would I work out what voltage I'd need?

Sorry if all this sounds really stupid and simple but I admit to knowing
nothing about LED's and my electrical is very limited. However I'm pretty
nifty with a soldering iron!

Any advice appreciated.

Jim.

 

[scada]

"James Duncan" <jameswd@btinternet.com> wrote in message
news:c4n8f2$2fj$1@sparta.btinternet.com...

I'd like to change the LED's inside my computer case (from green to blue)
but I'm not sure if its a matter of simply cutting off the old ones and
soldering on the new ones?

I've read that LED's come in different voltages? If this is the case how
would I work out what voltage I'd need?

Sorry if all this sounds really stupid and simple but I admit to knowing
nothing about LED's and my electrical is very limited. However I'm pretty
nifty with a soldering iron!

Any advice appreciated.

Jim.

Most of those small LEDs are around 1.8 - 2.1 Volts. The LED is current
limited usually by a resistor so the LED voltage is not critical. You do
need to observe polarity however, but if it doesn't light - just reverse the
leads.

 

[JeffM]

change the LED's (from green to blue)
I've read that LED's come in different voltages?
If this is the case how would I work out what voltage I'd need?
James Duncan

Most of those small LEDs are around 1.8 - 2.1 Volts.
...so the LED voltage is not critical.
scada

The voltage on blue LEDs is typically higher.

http://www.google.com/search?&q=blue-leds+volts+Gallium

Use Ohm's law to figure out circuits.
http://groups.google.com/groups?q=sci-electronics+ohm's-law+LED%20OR%20LEDs&sa=N&tab=wg&scoring=d