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More Electronic Gadgets for the Evil Genius by Bob Iannini (2006, Paperback) US $11.95
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Another great place to shop for Electronics Genius products is Amazon. They have more than just books! Here are some more information for Electronics Genius: People make a living teaching people how to sell on eBay. Is eBay still a good place to make money online? A lot of people are wondering if eBay still holds a lot of promise or if it's just too oversaturated for anyone not already capitalizing the site to make enough money to call eBaying more than a hobby. Successful female internet marketers like Sydney Johnston have created a world of multimedia courses like Auction Genius that promise to show people how to really capitalize on auction sites so that they can replace their income and even quit their day job. But can you still become an eBay powerseller even though there are already a lot of them? Can you really compete with people that have already been successfully selling on eBay for years? In truth, the number of people buying stuff online increases every day so increasing stores popping up to meet that demand make this opportunity a very potentially lucrative one. That's why you'll see that so many online stores exist on eBay. While this site started off with people getting rid of their excess storage in the basement or garage it has evolved to a global shopping mall where you can buy just about anything. There aren't just people selling whatever is in their garage. There are people that have thriving wholesale businesses on the site and some of those people run businesses from their computer and are more successful than the retail stores in the cities where they live. Why sell your goods on eBay? Sure, there's a cost of business of doing things with eBay, who charges fees for the use of their site but they do a lot for those fees including bringing you scads of online traffic that includes people with their credit card number in their hand. Instead of starting from scratch with your own website, this system already exists and enables you to simply start selling. You don't even need to have goods to sell because there are so many drop ship and wholesale opportunities out there that deal in many different categories so whether you want to sell household goods, electronics, fashion or something that's really specialized, auction sites are becoming the norm rather than the exception for shoppers. Because the site is trusted, has many payment options and a dispute resolution process a lot of people are more willing to buy there rather than buy from just any old online store. True, there are a lot of power sellers competing for business but there are a lot of customers, too. So, since there's so much competition, if you want to make money selling products on auction sites you need to become an auction genius. How do you do that? There are a lot of websites, blogs, newsletters, courses and e-books dedicated to teaching people how to figure out what to sell, how to market themselves and how to be the online store that people choose when browsing for goods. It's not too late to capitalize on selling on eBay, especially if you delve into the many resources available to teach you how to do it. About the Author I want to wire and power white LEDs for a replica scoreboard? I have a new baby on the way (my first boy), and I finally get to do a baseball theme nursery. I am building a replica scoreboard to go in the nursery and would like to use LEDs to light it (score, inning, count, etc.) The face of the scoreboard will be made from painted plywood and i will drill holes to fit the LEDs. My questions are: is there a better way to mount them than I described, how to wire them and power them, and is there an easy way to use an AC source rather than a battery? I am no electronics genius, but can figure most things out with a little direction. I just have know idea the type of resistance needed or how to calculate it, can I run all of the LEDs in one series, etc. Any help or guidance would be appreciated. My second goal (if I ever figure the first one out) will be to have a section of the LEDs function as a clock. I seem to remember one of those kids science projects you buy at the hobby shop doing some thing like that. Any ideas here would help also.
In practice, plastic like plexiglass or an ABS sheet would be better than wood. But that is a matter of personal experience and preference. You may be more comfortable with wood. Boil Water Advisory on for Parts of Dunbar Thanks for visiting!
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That mounting is fine. Hot melt glue on the back side is good way to hold them in place.
You need DC. So you can use any AC to DC adaptor. Pick one up at radio shack or your local electronics store. Given that you will be running a lot of diodes you'll want one that has as high a voltage and current rating as you can get.
You're going to run a bunch of branches in parallel and each branch will have several LEDs and 1 resistor in series. Each LED has an Anode which is usually the longer leg and a cathode which usually has a flat side on the case. the + voltage has to go to the anode. The cathode will go to the anode of the next LED or to the resistor which will then go to ground.
Consider one branch; white LEDs drop about 3v and draw about 25milliamps. So if you have a 24v supply you could run 6 or 7 in series in one branch. That would eat up 18~21 volts or so of your 24v. The remaining voltage is going to be dropped over a limiting resistor. You need that to control the current flow through the branch. If the remaining voltage is say 5v, then you would use a 200ohm resistor (resistance = voltage / current = 5v / 0.025A). The power rating for the resistor needs to be bigger than voltage times current, >5*0.025, > .125w, >1/8Watt.
Now consider the many branches together. If you've aimed for 25mA each then multiply the number of branches by .025A and compare that to the amp rating of the power supply you bought. That will give you an idea of the number of branches you can run.
In practice you'll find that some branches aren't as bright as others so you'll want to vary the resistance. and some LEDs will be brighter than others. matching them would be called intensity matching and is a pain unless you can buy them pre-matched. I would suggest just living with it.
Hope that gives you all you need. Email if you need more. Good luck.
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