
www.vellemanprojects.com
Pag. 3
11 exciting projects which you can actually use.
Projects featured in this box:
LED with push button* ................................................................. Light a LED when a pushbutton is pressed (pag.10)
A transistor as cuurent amplifier
* .................................................................. Light a LED using a transistor (pag.12)
Astable multivibrator
** ......................................................................................... Let LEDs flash alternately (pag.14)
Simple burglar alarm with LED indication and sound
** .......................... Example of a simple burglar alarm (pag.16)
Light detector
**......................................................................... Switch on a LED when there is sufficient light (pag.18)
Polarity tester
* ............................................................................................................Check battery polarity (pag.20)
Start-Stop circuit
*** ................................................................................. Control a LED using 2 pushbuttons (pag.22)
Timer circuit
*** ............................................................................... Make a LED switch off after a certain time (pag.24)
Light switch
*** .......................................................................... Make a LED switch on when it becomes dark (pag.26)
Water alarm
** .......................................................................................... Make a liquid level trigger an alarm (pag.28)
Running light with 3 LEDs
*** ...................................................... Make 3 LEDs light up shortly in succession (pag.30)
Difficulty level
* easy
** normal
*** hard
: see "velleman EDU01"
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