3 views

Consider the Schmidt trigger circuit shown below.

A triangular wave which goes from $-12 \mathrm{~V}$ to $12 \mathrm{~V}$ is applied to the inverting input of the OPAMP. Assume that the output of the OPAMP swings from $+15 \mathrm{~V}$ to $-15 \mathrm{~V}$. The voltage at the non-inverting input switches between

1. $-12 \mathrm{~V}$ and $+12 \mathrm{~V}$
2. $-7.5 \mathrm{~V}$ and $+7.5 \mathrm{~V}$
3. $-5 \mathrm{~V}$ and $+5 \mathrm{~V}$
4. $0 \mathrm{~V}$ and $5 \mathrm{~V}$