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Simple circuit Problem

@Lawliett
11 years ago
https://everycircuit.com/circuit/4792845010468864
Hey guys, I am just having trouble calculating the time it takes for the transistor to switch off after releasing the switch. Assume we power on, and released the switch, using the equation Vc = Vo*e^(-t/RC). I replaced Vc by 0.7 Volts, realizing that the transistor will turn off Vb<0.7, I get t app = 1.5 seconds But here, the led turns off after 3 seconds. What am I missing?
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