Introduction
A few months ago, I was looking for some LED suppliers and found that there are also UV LEDs. My heart went straight to upgrade and I didn't have that big setup, so I started looking for information on the internet. It turns out that some other people have done it, and this instructable confirms that this is really possible. An LED UV box has the advantage of a clear multi-tube: it can be tailored to the needs of any size. I bought 25 LEDs and started experimenting. This way I can find a distance and cost between LED density (pitch), LED and board.
led
LED OSSV53E1A from OptoSupply and they have a 140 degree angle. This means that there is a uniform density that can be used between shorter LED light-emitting diodes, which means that the height of the board is smaller for a given interval. Its peak wavelength is 405 nm. The results show that they emit enough reactive spectrum UV resistance to give a perfect exposure. I want to use a common voltage so that a 391Ω resistor in series with the LED is connected to 12V to ensure 20mA current.
You can see in the picture above, from 2 to 7 minutes, if the perfect exposure. Some overexposure began to appear in 7 minutes, only in the large copper field, due to the fact that the film was printed on a laser printer. The result is very different from the one I used to get the fluorescent tube: less than 12 minutes, apparently underexposed and above 14 which is obviously overexposed, leaving only a small time interval it is correct. So far, I have used 4 boards for 2 minutes of exposure and they just came out perfect. When the free time will provide anything, I will investigate the results in less than 2 minutes of exposure. Since any minute between 2 and 7 seems to work, there is no need for a timer. However, the second part should contain this basic circuit.
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