Multivibrator
Multivibratori su elektronički impulsni sklopovi koji imaju dva stanja.[1][2][3] Sklop nastaje međusobnim povezivanjem dve tranzistorske sklopke. Mogu biti povezane otpornikom ili kondenzatorom. Vrsta veze određuje vrstu stanja. Povezivanjem preko otpornika dobija se stabilno stanje, a povezivanjem preko kondenzatora kvazistabilno stanje.
Promjena stanja je skokovita, pa je idealizirani valni oblik promjene izlaznog napona pravougaon. Stanje sklopa može biti stabilno ili kvazistabilno tj. nestabilno.
- Stabilno stanje je stanje u kojem sklop može biti trajno, sve do nailaska spoljne pobude, kad se prebacuje u drugo stanje.
- Kvazistabilno ili nestabilno stanje je stanje u kojem se sklop zadržava tačno određeno vreme, nakon čega se prebacuje u drugo stanje. Trajanje kvazistabilnog stanja određeno je kapacitetom kondenzatora i otporom kroz kojeg se kondenzator prazni.
Svaki multivibrator ima dva stanja pa, zavisno o vrsti stanja, razlikujemo bistabilni, monostabilni i astabilni multivibrator.
Uz ova tri sklopa može se još dodati i emiterski vezani bistabil ili Šmitov okidni sklop kojim se postiže razlučivanje ulaznog napona po amplitudi. Sklop ima dva stabilna stanja.
Reference
- ^ Jain, R. P.; Anand, M. (1983). Digital Electronics Practice Using Integrated Circuits. Tata McGraw-Hill Education. ISBN 978-0-07-451692-8.
- ^ Rao, Prakash (2006). Pulse And Digital Circuits. Tata McGraw-Hill Education. ISBN 978-0-07-060656-2.
- ^ Clayton, G B (2013). Operational Amplifiers, 2nd Ed.. Elsevier. ISBN 978-1-4831-3555-7.
Literatura
- Clayton, G B (2013). Operational Amplifiers, 2nd Ed.. Elsevier. ISBN 978-1-4831-3555-7.
- Rao, Prakash (2006). Pulse And Digital Circuits. Tata McGraw-Hill Education. ISBN 978-0-07-060656-2.
- Jain, R. P.; Anand, M. (1983). Digital Electronics Practice Using Integrated Circuits. Tata McGraw-Hill Education. ISBN 978-0-07-451692-8.
Spoljašnje veze
- Video about working principle of multivibrators.
- Java applets simulating the multivibrator circuits.
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