Op-amp circuits worksheet with answers

Free printable Op-amp circuits worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

New worksheet Practise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________ Date: ____________

1.Easy

A sensor behaves like a 3 V source with an internal resistance R_s = 4.7 kΩ. It feeds a load R_L = 0.47 kΩ through an ideal voltage follower (unity-gain buffer). Find the load current I_L supplied by the op-amp output.

V_s = 3 VR_s = 4.7 kΩR_L = 0.47 kΩ

I_L = mA

2.Easy

The op-amp is ideal and runs from ±15 V supplies. Find the current I₁ through R₁, flowing towards the op-amp.

V_in = −0.6 VR₁ = 10 kΩR_f = 22 kΩ

I₁ = mA

3.Medium

The op-amp is ideal and runs from ±15 V supplies. Find the output voltage V_out.

V_in = 1.5 VR_a = 100 kΩR_b = 47 kΩR₁ = 2 kΩR_f = 10 kΩ

V_out = V

4.Medium

Choose the feedback resistor R_f that gives this non-inverting amplifier a voltage gain of 21.

R₁ = 2 kΩA_v = 21

R_f = kΩ

5.Hard

Two ideal op-amp stages are connected in cascade: an inverting amplifier (R₁, R_f1) followed by a non-inverting amplifier (R₂ to ground, R_f2 in the feedback). Both run from ±15 V supplies. The input is V_in = 0.75 V. Find the output voltage V_out.

R₁ = 10 kΩR_f1 = 100 kΩR₂ = 100 kΩR_f2 = 4.7 kΩV_in = 0.75 V

V_out = V

6.Hard

The integrator uses an ideal op-amp with ±15 V supplies; its output saturates at ±13 V. The capacitor is uncharged when a constant input V_in = 0.7 V is applied at t = 0. Find the output voltage V_out at t = 5 ms.

V_in = 0.7 VR = 1 kΩC = 4.7 µFV_sat = ±13 Vt = 5 ms

V_out = V

Answer key

1. I_L = 6.383 mA
2. I₁ = −0.06 mA
3. V_out = 2.878 V
4. R_f = 40 kΩ
5. V_out = −7.852 V
6. V_out = −0.7447 V

Full step-by-step solutions: practise this topic on examproblems.com.