B.E.A.M.
BEAM is an acronym standing
for :
Biology, Electronics, Aesthetics and Mechanics
last updated Mar 27, 2007
DIY : "nightlight, torch, flashlight"
Parts list :
|
solar-panel
: Panasonic 2433 |
NEC
473, 5.5V square caps |
white
led |
|
100K
resistor * |
NPN
2N3904 transistor |
5mm
photo-transistor |
|
Powerstor
1.5F supercaps |
|
|
* ( 22K,
33K, 47K and 100K Ohms resistors are included in Kit#9 to play with
sensitivity)
7 items for a "nightlight". Not
bad at all.
|
|
|
|
Basic concept :
Circuits quoted from :
http://www.engr.udayton.edu/faculty/jloomis/ece445/topics/egginc/pt_app.html
http://archives.e-insite.net/archives/ednmag/reg/1997/091297/19di_06.htm
http://www.aaroncake.net/circuits/lightdrk.htm