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Harbinger One LED

Started by dujuarez, September 23, 2014, 01:45:26 AM

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dujuarez

I just finished the Harbinger One. But before I connect the power (using Dunlop 18v transformer), I was thinking that the LED that I have connected (standard connection, positive from DC Jack to LED to number 3 lug on 3PDT footswitch)might burn out with the 18v. My question is, will it burn out? By the way I have the 4.7k resistor connected to LED.

jjanssen1

Hi,
Do you know what the voltage drop across the LED is?
Cheers
Joshua
+[----->+++<]>+.+.[--->+<]>---.---[->++<]>.++[--->++<]>+.

copachino

Quote from: dujuarez on September 23, 2014, 01:45:26 AM
I just finished the Harbinger One. But before I connect the power (using Dunlop 18v transformer), I was thinking that the LED that I have connected (standard connection, positive from DC Jack to LED to number 3 lug on 3PDT footswitch)might burn out with the 18v. My question is, will it burn out? By the way I have the 4.7k resistor connected to LED.

i dont think it will burn, since there its a current limiter resistor, so you can go safe if you ask me, its going to bright like hell but i wont burn
Affiliations: madbeanpedals fan and pedal porn lover....

kothoma

Better raise it to about 12k.

copachino

or probably 10k will b ok, even though i have used 1k for 9v, on 5mm leds, so 4.7k its not going to damage you led, but maybe its too much light than you need
Affiliations: madbeanpedals fan and pedal porn lover....

angrykoko

I used a 10K and though it was fine.
The early bird may get the worm, but the second mouse gets the cheese in the trap.

midwayfair


angrykoko

Quote from: midwayfair on September 23, 2014, 09:39:05 PM
When in doubt:

http://ledcalc.com/

That's cool. 
It needs one more calculation though "Retina Safe Recommended Resistor".
The early bird may get the worm, but the second mouse gets the cheese in the trap.

dujuarez

Thanks for all the help. I got it going and it sounds great and no problems with the LED. :)