Un circuit cu un consumator si un intrerupator alimentat printr-un transformator (cel mai simplu un incarcator de telefon functionabil pe care nul folosesti).
Http://www.youtube.com/watch?v=k7Sz8oT8ou0
http://www.youtube.com/watch?v=xUxGqG8u-ME
sau ceva mai simplu:
http://www.youtube.com/watch?v=AY9qcDCFeVI&feature=related
http://www.youtube.com/watch?v=ufoOJfzro2c&feature=fvwrel
http://www.youtube.com/watch?v=p3qXpqgaszs&feature=related