GATE Electronics and Communications (EC) 2016 Shift 1 Solved Paper

The following signal V_i of peak voltage 8 V is applied to the non-inverting terminal of an ideal opamp. The transistor has V_BE = 0.7 V, β = 100; V_LED = 1.5 V, V_CC = 10 V and −V_CC = −10 V.

The number of times the LED glows is ________