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 1 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 = 1 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 = 0.1 VR₁ = 10 kΩR_f = 47 kΩ

V_out = V

3.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 = 2.3 VV₂ = 2.9 VR₁ = R₃ = 22 kΩR₂ = R₄ = 10 kΩ

V₋ = V

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 = 0.5 VV₂ = 2.9 VR₁ = R₃ = 2 kΩR₂ = R₄ = 4.7 kΩ

V_out = V

5.Hard

The summing amplifier uses an ideal op-amp with ±15 V supplies. Find the current I_f through the feedback resistor, flowing towards the output.

V₁ = −0.6 VV₂ = 0.7 VR₁ = 100 kΩR₂ = 4.7 kΩR_f = 47 kΩ

I_f = mA

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 = 0.9 V. Find the output voltage V_out.

R₁ = 100 kΩR_f1 = 100 kΩR₂ = 4.7 kΩR_f2 = 47 kΩV_in = 0.9 V

V_out = V

Answer key

1. I_L = 0.2128 mA
2. V_out = −0.47 V
3. V₋ = 0.9063 V
4. V_out = 5.64 V
5. I_f = 0.1429 mA
6. V_out = −9.9 V

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