LED question

[JuanPabloJr.]

Hey,

 

If I wanted to wire 2 LED's into one pedal (have them both come on when the pedal is on), would I just connect the 2 LEDs and wire the pedal like usual,

 

or would I have to do something special?

 

Thanks

[hoerni]

Originally posted by JuanPabloJr. Hey, If I wanted to wire 2 LED's into one pedal (have them both come on when the pedal is on), would I just connect the 2 LEDs and wire the pedal like usual, or would I have to do something special? Thanks

 

 

You would want to change the resistor. The drop across a LED is roughly 2 volts. So if you have 2 in series, that's four volts.

 

I think 1k is a good value for normal pedals. That would be (9-2)V/1000ohm = 7mA. So if your voltage drop is 4V then you would want 5V/7mA = ~714 ohm. Pick the standard resistor size that comes closest and provides adequate brightness (probably 680 ohm)

 

Of course you should check that 1k is a normal value (7mA seems a bit high, but I don't remember off the top of my head)

[varialbender]

I don't know how often you plan on building, but you should get a breadboard and do small tests.

http://www2.whidbey.net/opto/LEDFAQ/The%20LED%20FAQ%20Pages.html#Q3

Try going with parallel, I'm guessing your resistors should be pretty clost to indentical?

[JuanPabloJr.]

Cool... I was wondering the same thing about AC jacks...

If I was housing 2 circuits together, could I have them both sharing 1 AC jack? Would I just combine the respective wires from each circuit on their points on the AC jack?

PS - I have a breadboard... I really should use it!