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post #157 of (permalink) Old 08-07-2013, 03:13 AM
Algae Grower
Join Date: Oct 2010
Location: Mississippi
Posts: 119
I copied IndyChusí idea and put a section of ink pen tube around the LED and that bumped the range up even more. It was a perfect fit, btw; awesome idea! Iím now getting a fairly reliable 15í to 16í with it. Thatís as far away as I get from my fixture without taking it into another room. Thatís good enough for me.

What I ended up with is a 120 ohm resistor between pin 3 and the base of a 2N2222 transistor. Well actually a 100 ohm and two 10 ohm resistors in series because I didnít find a 120 ohm. I didnít put a resistor between the LED and Vcc. I didnít really see the point since I canít saturate the transistor enough to pull enough current through it to cause an overload. I'll post an updated schematic in a little while.

I also went ahead and soldered everything onto a project board and installed it in an enclosure. Here she is.
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