Montajul este simplu, prevazut cu un tranzistor. Cind comutatorul K este in pozitia 1, tranzistorul nu lucreaza avind potentiale egale pe baza si emiter. in acelasi timp se incarca condensatorul de 400 uF (C1). Cind se trece comutatorul K in pozitia 2, baza se polarizeaza, astfel transformatorul lucreaza alimentind releul Rc, contactul 2 se inchide stabilind circuitul pentru alimentarea becului.
Timpul cat dureaza aprinderea becului este variabil, depinzind de pozitia potentiometrului P si de capacitatea condensatorului C1.
Cind condensatorul C1 s-a descarcat, baza nefiind polarizata, Re nu mai este alimentat si se decupleaza. Utilizare: se poate folosi in laboratoarele foto ca ceas de expunere.
This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Cookie settingsACCEPT
Privacy & Cookies Policy
Privacy Overview
This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may have an effect on your browsing experience.
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
