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
 

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