The following signal Vi of peak voltage 8 V is applied to the non-inverting terminal of an ideal opamp. The transistor has VBE = 0.7 V, β = 100; VLED = 1.5 V, VCC = 10 V and −VCC = −10 V.
The number of times the LED glows is ________
Enter numerical value using the virtual keypad. Round off where necessary.