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.

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1.Easy

A sensor behaves like a 10 V source with an internal resistance R_s = 10 kΩ. It feeds a load R_L = 4.7 kΩ through an ideal voltage follower (unity-gain buffer). Find the load current I_L supplied by the op-amp output.

V_s = 10 VR_s = 10 kΩR_L = 4.7 kΩ

I_L = mA

2.Easy

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

V_in = −1.1 VR₁ = 4.7 kΩR_f = 47 kΩ

V_out = V

3.Medium

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

R₁ = 1 kΩA_v = 21

R_f = kΩ

4.Medium

The difference amplifier uses an ideal op-amp with ±15 V supplies, with R₃ = R₁ and R₄ = R₂. Find the output voltage V_out.

V₁ = −2.2 VV₂ = 0.8 VR₁ = R₃ = 4.7 kΩR₂ = R₄ = 1 kΩ

V_out = V

5.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 = −2.6 V is applied at t = 0. Find the output voltage V_out at t = 5 ms.

V_in = −2.6 VR = 1 kΩC = 2.2 µFV_sat = ±13 Vt = 5 ms

V_out = V

6.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 = −0.8 V. Find the output voltage V_out.

R₁ = 1 kΩR_f1 = 4.7 kΩR₂ = 10 kΩR_f2 = 2 kΩV_in = −0.8 V

V_out = V

Answer key

1. I_L = 2.128 mA
2. V_out = 11 V
3. R_f = 20 kΩ
4. V_out = 0.6383 V
5. V_out = 5.909 V
6. V_out = 4.512 V

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