Instalatia are ca scop sa avertizeze patrunderea unei persoane intr-o incapere pe use sau fereastra, in mod fraudulos.
Instalatia functioneaza astfel: intre baza tranzistorului si emitorul sau, exista un scurt circuit realizat fie cu un contact, fie prin brazdarea usei sau a ferestrei.
Tinind cont de rezistenta foarte mica a contactului, rezulta ca baza se va afla la acelasi potential cu cel al emitatorului. in acest caz montajul nu va consuma energie.
in aceasta situatie releul nu va fi parcurs de curent. in momentul desfacerii contactului semicircuitul dintre baza si emitor dispare, iar polarizarea asigurata de rezistenta R1 face ca prin tranzistor sa treaca un curent de circa 15 mA. in acest caz releul atrage armatura si prin contacte pune in functie un sistem de alarmare.
CARACTERISTICI
Instalatia mai poate fi folosita pentru paza diferitelor portiuni de teren pentru semnalizare a patrunderii in diferite culoare.
Tensiunea de alimentare 9 V
Rezistenta releului . 360 ohmi
Soneria 9 V
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