Prob 11-37 Fig 11-32 solved

Prob 11-37 Fig 11-32 solved - -t/(RC) then: 0.76 = 1 -...

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Prob 11-37 Fig 11-32 For the alarm circuit: if the input from the sensor is 5 V, R = 750 k and the alarm is activated at 15 s when vc = 3.8 V, what is C? Vvc = 5(1 - e -t/ τ ) ; vc =5(1 - e -t/(RC) ) so 3.8 = 5(1 - e -t/(RC) ) and 3.8/5 = 1 - e
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Unformatted text preview: -t/(RC) then: 0.76 = 1 - e-t/(RC) or 0.76 1 = - e-t/(RC)-0.24 = - e-t/(RC) leading to: 0.24 = e-t/(RC) ln(0.24) = ln(e-t/(RC) ) -1.43 = -t/(RC)-1.43RC = -t C = t/1.43R = 15/1.43*750E3 C = 14 F...
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This note was uploaded on 12/14/2010 for the course ECET 107 taught by Professor Huehne,karl during the Spring '09 term at IUPUI.

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