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 4 V source with an internal resistance R_s = 10 kΩ. It feeds a load R_L = 10 kΩ through an ideal voltage follower (unity-gain buffer). For comparison, find the load voltage V_L if the load were connected directly to the sensor without the buffer.

V_s = 4 VR_s = 10 kΩR_L = 10 kΩ

V_L = V

2.Easy

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

V_in = 0.8 VR₁ = 2 kΩR_f = 10 kΩ

V_out = V

3.Medium

Choose the feedback resistor R_f that gives this non-inverting amplifier a voltage gain of 4.

R₁ = 22 kΩA_v = 4

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 voltage V₋ at the inverting input.

V₁ = 2.7 VV₂ = −2.4 VR₁ = R₃ = 22 kΩR₂ = R₄ = 2 kΩ

V₋ = V

5.Hard

The summing amplifier uses an ideal op-amp with ±15 V supplies. Find the output voltage V_out.

V₁ = 1.7 VV₂ = −0.4 VR₁ = 4.7 kΩR₂ = 100 kΩR_f = 2 kΩ

V_out = V

6.Hard

The integrator uses an ideal op-amp with ±15 V supplies; its output saturates at ±12 V. The capacitor is uncharged when a constant input V_in = 2.5 V is applied at t = 0. Find the output voltage V_out at t = 0.5 ms.

V_in = 2.5 VR = 10 kΩC = 0.1 µFV_sat = ±12 Vt = 0.5 ms

V_out = V

Answer key

1. V_L = 2 V
2. V_out = −4 V
3. R_f = 66 kΩ
4. V₋ = −0.2 V
5. V_out = −0.7154 V
6. V_out = −1.25 V

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