... Complete with a free trojan that turns your PC into a spam or DDOS zombie. If people want free EDA software, gEDA and PCB is fully functional and it's...
I did a little more testing of UV LEDs this weekend. The LEDs are plugged into a solderless breadboard and driven with a variable external power supply I tried...
The half angle is 10 degrees which is the half power point according to the data sheet from Best Hong Kong. So if I want the two LEDs half power point to fall...
While at the local Wal-mart I picked up a Scotch (3M) TL901 9" laminator for $US25.00. After taking it apart and verifying its usability for toner transfer, I...
I also got the 390-395nm BestHongKong LEDs. To test the exposure time I made a 3x3 square array as you did, but with 15mm pitch, not 13mm. To look for...
I am using the 395-400nm LEDs. Since there is a strong UV component to the LEDs I am not sure if a visual test for uniformity is going to be accurate. Since I...
... of the ... away. ... I think all the mirrors would do is reflect the light that is at a high angle of incidence and cause broader lines. Light at lower...
Damon, If you do the maths, you'll find that intensity for an infinite array of infinitesimal small point sources gives constant light intensity at all ...
The distance from the board is easily adjusted. If it needs 2 inches fine. If it needs 1.42, that is fine to. Thanks for the pointer to the pdf. I will take a...
... Have you tried chopping off the tops of the LEDs with a Dremel? That should give significantly broader coverage, no longer constrained to the 10 degree...
I have been fooling around with these UV LED's for several months by fits and starts. I bought a bunch from BestHongKong, and started out to use those, but...
I did up a little program in scilab to add up contributions of a 1D array of LEDs based on the intensity diagram from the BestHongKong LEDs. You will have to...
This question is suited for Electronics_101. http://groups.yahoo.com/group/Electronics_101 Thank you, Steve Greenfield owner Homebrew_PCBs and Electronics_101...
... .... Very interesting! I have had SciLab installed and wanted to do something useful with it for a while, so I just opened it up and dropped in the code...
... That 2" was just minimum distance from what I observed to look 'fairly' uniform. I had a quick look at you model and it seems valid to me. I'm a bit of a...
This is where you get help designing or making the PCB. Elecronics_101 is where you get help designing the circuit, which is what you need first. No big deal. ...
Many of the of "professional" lab/prototyping PCB exposure units seem to be fitted with a vacuum assisted frame. I'm wondering if vacuum has much advantage...
I'm modifying an Epson Picturemate 200 for direct toner transfer, and I have a couple of questions about the ink cartridge that I hope someone can answer. The...
It's been done before - see the links for this group. I think it will provide the best resolution short of photographic techniques. From what I now have found...
Prior to advancing to this site you should check out http://tech.groups.yahoo.com/group/electronic_prototypes/ It may help you get to the point to advance to...
I would not bother to sign up for this group. There is not very much information and most of the messages are spam. Appears to be a "come on" to sign up for...
It is important to use the correct terms, I'm not trying to be retentive. That is an inkjet and so uses ink, not toner. I don't know if that's the best printer...
So... people should leave this group and join yours? I don't see why that is necessary. This group is for all experience levels. I see this as splitting the...
