Semnalizatorul de lumina avertizeaza variatiile de flux luminos. Este construit dintr-un oscilator de audio-frecventa in punte “WIEN”, modificata, care intra in oscilatie cind valoarea curentului care parcurge fotodioda {deci si tranzistorul ti) atinge un anumit nivel.
Tonul generat si pus in evidenta de difuzor poate varia proportional cu intensitatea fluxului luminos care cade pe fotodioda.Punerea in functie a aparatului se face prin bascularea intrerupatorului K, in pozitia pornit.Dupa aceasta operatiune elementul sensibil (fotobascula) se orienteaza catre sursa de lumina.
Alimentarea aparatului se face de la o baterie de 9 V. Dupa epuizarea sursei de energie se scot stifturile de la capacul cutiei, se inlocuieste bateria avind in vedere ca firul rosu reprezinta polul (+).
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