[sac-forum] Re: Red LED chart lamp
- From: "Steve Coe" <stevecoe@xxxxxxxxx>
- To: <sac-forum@xxxxxxxxxxxxx>
- Date: Sun, 26 Nov 2006 18:19:36 -0700
Peter;
Knowing that Dave Fredericksen wanted one also, I will speak for him and
take both.
Thanks;
Steve Coe
-----Original Message-----
From: sac-forum-bounce@xxxxxxxxxxxxx [mailto:sac-forum-bounce@xxxxxxxxxxxxx]
On Behalf Of Peter Argenziano
Sent: Sunday, November 26, 2006 6:14 PM
To: SAC Forum
Subject: [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 <http://www.siowl.com/>
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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