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 = 47 kΩ. It feeds a load R_L = 0.47 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 = 10 VR_s = 47 kΩR_L = 0.47 kΩ

V_L = V

2.Easy

An inverting amplifier with an ideal op-amp must have a voltage gain of −10. The input resistor is R₁ = 1 kΩ. Find the feedback resistor R_f.

A_v = −10R₁ = 1 kΩ

R_f = kΩ

3.Medium

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

V_in = −1 VR₁ = 47 kΩR_f = 47 kΩ

V_out = 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 = 0.3 VV₂ = 2.7 VR₁ = R₃ = 22 kΩR₂ = R₄ = 2 kΩ

V_out = V

5.Hard

The op-amp is ideal and runs from ±15 V supplies. The resistor ratios are not matched. Find the output voltage V_out.

V₁ = −1.5 VV₂ = 1 VR₁ = 47 kΩR₂ = 100 kΩR₃ = 1 kΩR₄ = 22 kΩ

V_out = V

6.Hard

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

V₁ = 1.7 VV₂ = −1.5 VR₁ = 47 kΩR₂ = 2 kΩR_f = 1 kΩ

V_out = V

Answer key

1. V_L = 0.09901 V
2. R_f = 10 kΩ
3. V_out = −2 V
4. V_out = 0.2182 V
5. V_out = 6.183 V
6. V_out = 0.7138 V

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