Wiring Schematic Critique?

[Jay-gon Jinn]

I would not have noticed that, thank you!

You are welcome! I would download it and get started on it, there's a lot of information in it, and you'll want to have a good idea of what you're doing before you get started wiring it up.

[CET]

I've been reading up and I'm wondering if I need to include any resistors. I've read about people burning out led's and switch lights because they didn't add resistors or have the right ones. I saw TCSS has a LED resistor chart, but I don't understand it.

[Forgetful Jedi Knight]

Resistors are always a good idea. You may want to read through and study this, especially if you plan on building sabers in the future.

http://forums.thecustomsabershop.com...e-to-Ohm-s-Law

[Yorginsnarff]

I've been reading up and I'm wondering if I need to include any resistors. I've read about people burning out led's and switch lights because they didn't add resistors or have the right ones. I saw TCSS has a LED resistor chart, but I don't understand it.

so, I have a nano biscotte (v2), 3.7V li-ion setup, and I'm using a .47 ohm, 1/2W resistor. Works great. No issues so far

[CET]

OK, so If I'm running Rebel Star LED and a 3.7V battery, I come up with a 0.7 ohm, 0.7 W resistor.

R=(3.7-3)/1
R=0.7

P=0.7*1^2
P=0.7

For the crystal chamber LED I'm running a 5mm white LED. I come up with a 0.4 ohm, 0.4 W resistor.

R=(3.7-3.3)/1
R=0.4

P=0.4*1^2
P=0.4

Does this look right?

I'm assuming I should NOT run these in series.

[Forgetful Jedi Knight]

The first one is correct, though you will have to "round up". The second one partially depends on if you are using a sound card or not, and also the current is wrong. 5mm LEDs only take 20 mA.

[CET]

I plan on running them both through the NB.

You're right, it is 20mA. That could have been bad! I re-did the math and the result I get is a 20 omh, 1/4 W resistor.

You've been very patient and helpful with me. Thank you!

[Robust Stardust]

OK, so If I'm running Rebel Star LED and a 3.7V battery, I come up with a 0.7 ohm, 0.7 W resistor.

R=(3.7-3)/1
R=0.7

P=0.7*1^2
P=0.7

Also (please correct me if I'm wrong), but if you are planning on using a deep red Rebel Star that you linked to (which have a max current of 700mA), then the amperage value in this first calculation should be 0.700 (700mA) so as not to overdrive and burn out the main LED. This would slightly change your first resistor value.

[Forgetful Jedi Knight]

Also (please correct me if I'm wrong), but if you are planning on using a deep red Rebel Star that you linked to (which have a max current of 700mA), then the amperage value in this first calculation should be 0.700 (700mA) so as not to overdrive and burn out the main LED. This would slightly change your first resistor value.

If he "rounds up" as I suggested, a 1 Ohm, 1W would work even at 700 mA.

But now that I look at it again, the Vf for that Deep Red looks pretty high. it should be more in the 2.3-2.4V range IIRC.

[CET]

Sorry, I guess I'm throwing some confusion here. My current build is my first saber, which will have a white blade and crystal chamber.

I am planning a second build with a red blade and crystal chamber, so I may have accidentally linked to that. However, this thread is strictly about my first build (white blade/crystal).

My wishlist currently has:

• .47ohm 1/2w resistor x 1 (Blade)
• 18ohm 1/4w resistor x 2 (Crystal chamber and Anti Vandal switch)