B.E.A.M.
BEAM is an acronym standing for :
Biology, Electronics, Aesthetics and Mechanics
Andy's Light-Tracking Head
DIY : LightHead
Parts list : updated Feb., 28, 2001
1 bicore chip : 74HCT240 2 IR leds (from my PC mouse :-) ) 1 voltage regulator 78L05
It's only 3 items, don't tell me it is too much for you, my dear friend :-)
 
Math: "  Like to share my bots with other people, otherwise I wouldn't present them on my homepage  "

My version on How to freeform it (without PCB) : Math's Light head2

1a.  make sure you know the orientation of the chip
pin 20 is anode +ve, ( Vcc ) pin 10 is cathode -ve, ( ground )
1b.  using the brand-new " poor " resistor lead, lay down the track as shown
solder the pin 1, 19 and 10 this is all connected together as cathode -ve.
2a. solder pins11 to 18 together. Yes, I confirmed with Math already. 2b. this is one of the motor lead. Make it long for easy handling.
3a. solder pins3, 5, 7 and 9 together. 3b. this is the other motor lead. Make it long for easy handling.
4a. solder pins2, 4, 6 and 8 together. 4b. Oh, look at the shadow :-)
Now, the IR leds, kindly donated from my PC mouse :-)
5a. solder the IR leds in series : +ve lead goes to pin 1 5b. solder the -ve lead of led to pin 20
6a. bend a wire and solder onto pin 4 (either 2, 4, 6 or 8) 6b. and the lead goes between IR leds
7a. the layout of 78L05 : 1,2,3 is output, Gnd, and input 7b. solder output to pin 20 and Gnd to pin 1
This is it. Just hook up the battery and motor, and let it track the light source.
And most of all, have fun :-)

Tutorial on how to make solar-bug (Ben Hitchcock's Fred : light-seeking robot)

Tutorial on how to make Bicore Head
 
 

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