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How much batteri will I need? Answered

well for my new project im gonna add 50 small diods, how much batteri will I need? Diod info: 1,6 - 2 V 20 mA 5mm Batteri info: A normal 9v batteri

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tiermaster

10 years ago

Thanks. Well thats all help I needed. Thanks alot!

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tiermaster

10 years ago

THe time doesnt matter, will one 9v batteri make them all light?

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Sandisk1duotiermaster

Reply 10 years ago

yes, it well defiantly work but you'll need a resistor

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tiermasterSandisk1duo

Reply 10 years ago

Im not that good at this, what does a resistor do? XD and can I use any kind of resistor? where do I need to attach it?

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Sandisk1duotiermaster

Reply 10 years ago

ok, let's begin a resistor decreases the amount of power going to the LED, keeping the LED from burning out, you will need a 390 ohm resistor (orange gray brown gold) you can attach the resistor to the LED and then to the battery like in the picture, and conenct one side of the Resistor to a battery, the un-soldered side of the led to the battery

solder_resistor.jpg
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tiermasterSandisk1duo

Reply 10 years ago

will I need a resistor to every led? and do I really need it? XD its alot more work, running to the store and soldering everything xD If I use a AA, will I still need the resistor?

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tiermastertiermaster

Reply 10 years ago

also ill be using only 18 doides, what resistor will I need now? (awnser the other question aswell )

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Sandisk1duotiermaster

Reply 10 years ago

resistor 1 is 27 ohms resistor 2 is 220 ohm follow the picture

resisotr.jpg
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11010010110tiermaster

Reply 10 years ago

you can group them in groups of 3 leds / resistor (up to 4 - 5 leds / resistor if leds are really 1.6 - 2 V)

use this wizard to figure out what resistor to use and how to connect

http://led.linear1.org/led.wiz

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Sandisk1duo

10 years ago

diode

use a AA

they're cheaper and last longer

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11010010110

10 years ago

it depends how much time you want to get

my guess : 1 battery = 1 - 2 hours