[sac-forum] Red LED chart lamp

Not sure if you've all seen my red LED table chart lamp at a star party, but 
have I got a deal for you do-it-yourselfers.

I have just about enough parts (minus the batteries and one knob) to make two 
lamps. I thought I'd build a couple more, but haven't gotten around to it. So, 
I'd be willing to sell a couple of lamp kits for $20 each, including the 
sacrificial lamp. To see the design, visit Andrew Cooper's website: 
http://www.siowl.com/atm/redlamp/redlamp.html
It's easy to build, given that you possess the ability to read a simple 
schematic diagram and can do some basic soldering.

Included in the kit:
1 - desk lamp
4 - super ultrabright red LEDs (that's what they're called)
1 - LM317 voltage regulator
1 - 100uF 35v capacitor
2 - 1N4001 diodes
1 - 1k potentiometer
1 - knob (only one kit will have the knob)
1 - 10 ohm ¼ watt resistor
1 - 220 ohm ¼ watt resistor
1 - 560 ohm ¼ watt resistor
1 - small perfboard
1 - DC power jack

You supply the power source of your choice. The kit will allow you to construct 
a 12-volt DC, 120-volt AC or combo lamp. I built mine as 12-volt only, since I 
only use it at star parties. For power I use a 5-Ah gel cell that cost about 
$20 and lasts around 100 hours at max brightness (a level never actually used) 
between recharges.


Peter

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