You need to REALLY go over Ohm's Law. The speaker has nothing to do with the resistor calculation. In addition, the wattage is only half of the "equation" anyway.
You need to REALLY go over Ohm's Law. The speaker has nothing to do with the resistor calculation. In addition, the wattage is only half of the "equation" anyway.
TCSS MODERATOR
All n00bs READ these first (PLEASE)!!!:
1. Forum Guidelines
2. FJK’s “Down and Dirty” guide to Ohm’s Law
"Yeah, yeah, I've heard it all before... you want blindingly bright, super loud, running 1138 blinkies off of the cheapest sound card you can find AND you want all of it to run on a battery the size of a dime, and run for a very, VERY long time. That one cracks me up every time..."
My email: fjk_tcss@yahoo.com
if you are not that great with math just do a google search for LED resistor calculator. you will need your source voltage (3.7) the voltage drop for your LED (reds are usually 2-2.3V look up what yours is) and your desired amps. 700mA is safe for reds.
From your method it has said a 2w resistor is required.
TCSS MODERATOR
All n00bs READ these first (PLEASE)!!!:
1. Forum Guidelines
2. FJK’s “Down and Dirty” guide to Ohm’s Law
"Yeah, yeah, I've heard it all before... you want blindingly bright, super loud, running 1138 blinkies off of the cheapest sound card you can find AND you want all of it to run on a battery the size of a dime, and run for a very, VERY long time. That one cracks me up every time..."
My email: fjk_tcss@yahoo.com
TCSS MODERATOR
All n00bs READ these first (PLEASE)!!!:
1. Forum Guidelines
2. FJK’s “Down and Dirty” guide to Ohm’s Law
"Yeah, yeah, I've heard it all before... you want blindingly bright, super loud, running 1138 blinkies off of the cheapest sound card you can find AND you want all of it to run on a battery the size of a dime, and run for a very, VERY long time. That one cracks me up every time..."
My email: fjk_tcss@yahoo.com
I have a similar set up in mind. I did this math for a rebel Tri Deep Red (2.4V , 700mA), a NBv2 and a Li-Ion 18650 3.7V 3400mAh PCB. It looked like this: 3.7v-2.4v/.7= gave me 1.85ohm I was going to use this http://www.thecustomsabershop.com/15...istor-P13.aspx
Is this the correct math? It is my understanding that resistors are like the price is right, as close as you can get without going over?
Thanks and sorry to jump on your thread.
Generally it is safer to always round up on resistor values, not down. Jump on up to the 2.2ohm resistor. http://www.thecustomsabershop.com/22...istor-P11.aspx
We all have to start somewhere. The journey is all the more impressive by our humble beginnings.
http://led.linear1.org/1led.wiz for the lazy man's resistor calculator!
http://forums.thecustomsabershop.com...e-to-Ohm-s-Law for getting resistor values the right way!
I'm willing to bet that it won't take 8 years before you start on your second. This hobby is addicting, the only limit is the depth of your wallet.
We all have to start somewhere. The journey is all the more impressive by our humble beginnings.
http://led.linear1.org/1led.wiz for the lazy man's resistor calculator!
http://forums.thecustomsabershop.com...e-to-Ohm-s-Law for getting resistor values the right way!
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