RES: [sdiy] voltage and LEDs

[Luis Marka]

Hi Dennis,
You need a constant current source. I have done it using pretty simple
circuits from here:

http://www.instructables.com/id/Circuits-for-using-High-Power-LED_s/

I CC'ed this to the list, maybe someone else will find that useful.
Cheers!


-----Mensagem original-----
De: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]Em nome de db
Enviada em: quinta-feira, 11 de fevereiro de 2010 07:49
Para: synth-diy at dropmix.xs4all.nl
Assunto: [sdiy] voltage and LEDs



I want to drive a 3watt led
# 1000mA - Max Drive Current
# 3.90Vf - Forward Voltage

Can just use a 7805 to get 5v, and then drop it with two diode in series to
get 3.6v?
Or do I still need resistors in series with these LEDS?


dennis.barton:skylab2000[socal]



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