Consider the regulated power supply given below:Here VZ

Home » Physical Electronics Devices and ICs » Physical electronics devices and ics miscellaneous » Question

Consider the regulated power supply given below:
Here V_Z = 9·1 V and V_BE = 0·7 V. Value of V₀ is equal to—

1. 25·3 V
2. 29·4 V
3. 27·8 V
4. 30·5 V

Correct Option: B

The given figure

Given, V_Z = 9·1V, V_BE = 0·7V, V0 =?
From above figure, voltage at node A
V_A = V_BE + V_Z = 0·7 + 9·1 = 9·8V
Applying polential diviider rule at node A, we get

V_A = V₀·	R₄
	R₄ + R₃

or V₀ = V_A·		R₄ + R₃
		R₄

or V₀ = 9·8 ×	(1K + 2K)	= 29·4V
	2K

Hence alternative (B) is the correct choice.