M
Mike
- Jan 1, 1970
- 0
Thanks for all the help from everyone.
I'm trying to calculate exactly what I need. I'm not sure how many LEDs but
let's say I had 10 and did the following.
batteries (3 x 9volt)
on/off switch
resistor
LEDs 10
Would that be correct?
As far as the resistor, I came up with the following (trying to learn).
If each LED is 20 mA and 2V, then 10 is 200 mA and 20V. If I have a 27V
power supply, then I need to remove 7V.
7V/.2A=35 Ohms
Then I'm lost. What resistor would I need?
As far as the wire, any special type? Should it be coated?
Thanks again.
Mike
PS. My son also built Shea Stadium (NY Mets, about 3' in diameter) and we
put false lights but are thinking to go back and put real ones. Would the
LEDs give off a nice glow to the field?
I'm trying to calculate exactly what I need. I'm not sure how many LEDs but
let's say I had 10 and did the following.
batteries (3 x 9volt)
on/off switch
resistor
LEDs 10
Would that be correct?
As far as the resistor, I came up with the following (trying to learn).
If each LED is 20 mA and 2V, then 10 is 200 mA and 20V. If I have a 27V
power supply, then I need to remove 7V.
7V/.2A=35 Ohms
Then I'm lost. What resistor would I need?
As far as the wire, any special type? Should it be coated?
Thanks again.
Mike
PS. My son also built Shea Stadium (NY Mets, about 3' in diameter) and we
put false lights but are thinking to go back and put real ones. Would the
LEDs give off a nice glow to the field?