HDD activity led

[rafdmr24]

Hello everyone, does anybody know how many volts or watts does the hdd activity led needs? I need to connect it to the smallest battery which has enough power & its needs to be on a bicycle pedal. I have no clue about electrical,circuitry stuff. thanks.

 

[kimsland]

Although this circuit states 9V it's more likely 3.5Volts

I found this really easy page to understand here: http://www.kpsec.freeuk.com/components/led.htm

Have fun making your circuit

 

[rafdmr24]

Wow, it looks confusing but i`ll take my time. Thank you very much.