The diode in the circuit given below has V_ON = 0.7V but is ideal otherwise. The current (in mA) in the 4kΩ resistor is __________.

In the ac equivalent circuit shown, the two BJTs are biased in active region and have identical parameters with β >> 1. The open circuit small signal voltage gain is approximately _______.

In the circuit shown, V_O = V_OA for switch SW in position A and V₀= V_OB for SW in position B. Assume that the opamp is ideal.

The value of $${{{V_{OB}}} \over {{V_{OA}}}}$$ is _____

In the bistable circuit shown, the ideal opamp has saturation levels of $$ \pm 5V.$$ The value of R₁ (in k$$\Omega $$ ) that gives a hystersis width of 500 mV is ______