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Q4 :( 8 marks) For the following circuit, if a sinusoidal signal with a peak value of 10 V is applied to the input.

Q4 :( 8 marks) For the following circuit, if a sinusoidal signal with a peak value of 10 V is applied to the input. (Assume that Vr(LED)= 1.2V). Describe the operation of this circuit in full details. Sketch the input and output voltages. 10V VREF, HIGH Input Voltage -10V SV 10 v Buffer Output Voltage VREF, LOW O LED 31 k 10V

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