Three types Astable neither state is stable Applications oscillator etc Monostable one of the states is stabl e but the other is not Applications timer etc Bistable it remains in either state indefinitely Applications flipflop etc Reference httpe ID: 25800
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Lecture 09 -3 ELE2110A ©2008neither state is stable.Monostable-one of the states is stablit remains in either state indefinitely. Reference: http://en.wikipedia.org/wiki/Multivibrator Lecture 09 -11 ELE2110A ©2008 Basic Mode of OperationWhen VB1reaches Von, the circuit enters state 1 again, and the Back to state 1: Lecture 09 -12 ELE2110A ©2008ed up, neither transistor is ON. Parasitic capacitors between B and E of Q Lecture 09 -13 ELE2110A ©2008 Multivibrator Frequency T/2ONCRtCCCCCRtonCCCCONBVVeVVeVVVVvfor )1(2)1)(2()(2323//1 = T/2, v Lecture 09 -14 ELE2110A ©2008 for )1(2232/CRTCCCCeVV )1(21232/CRTe 23232/)2(ln22ln2 5.023CRTCRTeCRT 23)2(ln21CRf f =1.53kHz. Lecture 09 -15 ELE2110A ©2008 is negative, BE junction of Q CCONVV BreakONCCBreakCCONVVVVVV Lecture 09 -17 ELE2110A ©2008 Q2 setreset Both capacitors removedoutCircuit remains in state 2 until Reset is lowSimilar operationCircuit remains in state 1 until Set is lowBehave as an RS flip-flop