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LED powering question

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mvolke1:
One more thing, I gave you the wrong button. I got these: http://rover.ebay.com/rover/0/e11400.m1842.l3160/7?euid=3f6a5d3795b74fb69baef79d39083fc7&loc=http%3A%2F%2Fcgi.ebay.com%2Fws%2FeBayISAPI.dll%3FViewItem%26item%3D360296413375%26ssPageName%3DADME%3AL%3AOC%3AUS%3A3160

PL1:

--- Quote from: mvolke1 on October 18, 2014, 09:30:47 pm ---What's the magic smoke? Will it burn it out?

--- End quote ---
The joke is that all electronic components contain "magic smoke" -- they stop working when you let it out.   :lol

Applying 9v to an LED/current limiting resistor combination rated for 5v will definitely burn it out unless you add another resistor to drop the extra 4v.

The CDRs have an LED and current limiting resistor (R1) combination rated for 5v.

       5v --- LED -- R1 --- Ground

To safely use 9v, you'll need to add a second current limiting resistor (R2) that drops 4v.

       9v --- LED -- R1 --- R2 --- Ground

           or

       9v --- R2 --- LED -- R1 --- Ground

Either way works.


--- Quote from: mvolke1 on October 18, 2014, 09:34:11 pm ---One more thing, I gave you the wrong button. I got these: http://rover.ebay.com/rover/0/e11400.m1842.l3160/7?euid=3f6a5d3795b74fb69baef79d39083fc7&loc=http%3A%2F%2Fcgi.ebay.com%2Fws%2FeBayISAPI.dll%3FViewItem%26item%3D360296413375%26ssPageName%3DADME%3AL%3AOC%3AUS%3A3160

--- End quote ---
LEDs in both are rated for 12v -- no problem.   ;D

They probably come from the same factory.   :lol


Scott

mvolke1:
You're the man.

Do you think another solution would be to buy one more of those green buttons and then just switching out the LED lamps?

PL1:
Not sure if you are giving up on all rectangular buttons or just looking for different ideas so I'll just throw some options your way and see if there's anything you like.

The translucent round LED buttons come in a variety of colors with matching LEDs. (Avoid yellow button with yellow LED or you get muddy orange :puke)

Rick said here that he will be getting some black rimmed ones soon. (not the sawed-off volcano-wannabes  >:D)

You can print your own inserts like the ones here.



If you want to use rectangular buttons like these or these from Divemaster, the #161 incandescent bulbs they come with have the same wedge-base as the LEDs in the buttons you linked. (confirmed good fit with the low-profiile ones)



Louis Tully is printing custom inserts for the CDRs on his Asteroids Deluxe build here.




Scott

mvolke1:
Hey Scott,

I didn't want to give up on the square insert coin button. What I was think was maybe switching out the lamp and bulb from another switch rather than wiring up something new.

Do you think I could just switch these parts out?

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