09-08-2003, 07:37 PM
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GaN: Blue
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Join Date: Dec 2002
Location: Inside your blue/white LEDs
Posts: 78
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Light/Dark Headlight PCB Plans
Here is my surface mount PCB plan for the dark activated headlights I was talking about a long time ago.
The board is 1/2" long by 1/4" high with a 1/8" notch at the top for the antenna. If you haven't guessed already, this is supposed to fit in that rectangular hole in the back window. The silver pads in the top right go to the LED(s), negative pad on the outside. The other two pads (top left and slightly below other) go to the battery(ies),positive pad in the upper left. This uses a 1K SMD resistor, a (small!) photocell (below 10K dark resistance), and a 2N3904 SMD transistor.
You can run any color LED. 1 battery for red, yellow, and dim green; 2 batteries for blue, white, violet, and superbright green.
This is an analog circuit, so the lights will be different brightnesses, not "on or off only". You can always add a small relay or something to make it have a "digital" output.
I have not built the PCB, but I have tested the circuit, so I know that works.
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09-09-2003, 06:14 PM
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GaN: Blue
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Join Date: Dec 2002
Location: Inside your blue/white LEDs
Posts: 78
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So... Anybody try it yet?
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09-09-2003, 08:08 PM
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TinyRC Pro
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Join Date: Feb 2003
Posts: 20
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Haven't done it yet, but that looks pretty wicked.
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Auto Modellista blue gears, 3.5 , 49 Mhz
honda s2000 ,yellow body, stock gears, 3.2, 49Mhz, electrical nitrous oxide (I will inform everyone of this invention sometime)
ultraviolet (I will inform everyone of this paint job sometime) s2000 body
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