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Pink Coin Inserts? (Coin Reject Buttons)

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Tiger-Heli:

The website also said the UV LED was not as bright as he had hoped, FWIW.

Kaytrim:

Ok folks, think of a filter as sunblock.  It selectively blocks the UV rays from reaching your skin.  The coin return or any piece of colored plastic is a filter only it exclusively filters all light rays except for those that are the same color as the plastic.

What Randy is trying to say is that no matter what source you use for a light you will only get red light when it shines through a red filter.  There was a project here that tried to shine a blue LED through a red coin button.  The button stayed red but where the coin went through you could see blue.  I think it was sodapopkins PunchOut project.

TTFN :cheers:
Kaytrim

ChadTower:


--- Quote from: Kaytrim on March 30, 2007, 04:17:03 pm ---What Randy is trying to say is that no matter what source you use for a light you will only get red light when it shines through a red filter. 

--- End quote ---

Not always that simple... it also depends on how deep the filter is.  Those red filters are really red and the yellow filters are only somewhat yellow.  The darker the filter the more it will block.  The lightness of the yellow color is going to help here as it's not going to be nearly as effective in blocking off wavelength colors as the dark red button.

Aurich:

The front of Happ coin inserts, do they come off? My coin door has the whole front plastic come off. That wouldn't be too hard to replace with a piece of clear plexi and a pink gel filter. Drill out the back of the insert so the light goes straight through.

RandyT:


--- Quote from: ChadTower on March 30, 2007, 05:00:36 pm ---Not always that simple... it also depends on how deep the filter is.  Those red filters are really red and the yellow filters are only somewhat yellow.  The darker the filter the more it will block.  The lightness of the yellow color is going to help here as it's not going to be nearly as effective in blocking off wavelength colors as the dark red button.

--- End quote ---

Exactly correct.  It has to do with the filters spectral transmission curve.  You can have a very narrow spike at the red frequency, and then only that shade of red will pass through, and then only at the percentage indicated by the height of the spike.  But if you have a broad, high curve that peaks in the yellow frequencies, it will appear yellow (or more likely "pale yellow") to your eye, yet allow certain amounts of other colors to pass as well.

In the absence of clear, the best bet may be a pale yellow.  It may still block enough to change the color of the LED, or be too dim, but it's probably your best bet.  "Amber" sounds like it would be too dark, but who knows.  One persons "amber" could be another's "pale yellow" :P

RandyT

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