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 Post subject: Portable powered / bumper sticker signage
PostPosted: Wed Jun 15, 2011 9:53 am 
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Joined: Tue Apr 06, 2010 10:12 pm
Posts: 750
This was causing the open house sign thread to drift even further afield, so I'm moving this part of the conversation to a new thread.

Quote:
On the 12VDC power / bumper sticker thought.

Any geeks want to check this out and let me know if they think it will work, I believe a single LED strip draws only a few 100 milliamps. (.015-.020) on the bench supply if I'm remebering correctly.

Circuit wise figure 19 on page 10 is about the simplest circuit I could find. I'd love to get comments from the hardcore electronics geeks. I'm thinking the ICL7660A part as it allows for 12V input, do Cars tend to be a bit higher than that? I haven't put a meter on one lately.

http://www.intersil.com/data/fn/fn3072.pdf


Pete


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 Post subject: Re: Portable powered / bumper sticker signage
PostPosted: Wed Jun 15, 2011 10:03 am 
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Joined: Thu Dec 02, 2010 12:25 pm
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Location: Minneapolis
Standard automotive alternator output is around 13.2 volts.

Wikipedia has some good basic info on charge pumps.

-Jim Hart


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 Post subject: Re: Portable powered / bumper sticker signage
PostPosted: Wed Jun 15, 2011 12:05 pm 
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why not use what car modders have used for years?

electroluminescent tape <-- that's a link, btw
it's cheap, and the power requirements are pretty minimal.


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 Post subject: Re: Portable powered / bumper sticker signage
PostPosted: Wed Jun 15, 2011 12:22 pm 
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Thanks for the replies, this is a charge pump circuit, and EL Wire would work too, but I don't think it would be cheaper.

I'm looking at the state laws, and I'm not sure if this is kosher, especially if it's red. I know a company was trying to get the law changed so they could mount billboards, like the full color LED ones along the highways on cars, but I can't find what happened.

Pete


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 Post subject: Re: Portable powered / bumper sticker signage
PostPosted: Wed Jun 15, 2011 12:35 pm 
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jakrabit wrote:
...

electroluminescent tape <-- that's a link, btw
....


I hate that links are not offset from other text in the forums too, I usually set the font color of just the URLs text to blue or something, just so it's clear, or clearer.

Pete


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 Post subject: Re: Portable powered / bumper sticker signage
PostPosted: Wed Jun 15, 2011 12:51 pm 
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I could not find any amendments to this, but do not have access to Westlaw or Nexus to be sure..

https://www.revisor.mn.gov/bin/getpub.php?type=s&num=169.64&year=2006


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