GATE EC 2016 Set 1 Q14 — Op-amp Circuits

The following signal $V_i$ of peak voltage $8 \: V$ is applied to the non-inverting terminal of an ideal Op-amp.The transistor has $V_{EE}=0.7 \: V$, $\beta=100; \: V_{LED}=1.5 \: V$, $V_{CC}=10 \: V$ and $– V_{CC}= – 10 \:V$.

The number of times the LED glows is ________