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

V_s = 2 VR_s = 4.7 kΩR_L = 10 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 = 2 VR₁ = 2 kΩR_f = 4.7 kΩ

I₁ = mA

3.Medium

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

V_in = 1.9 VR₁ = 22 kΩR_f = 22 kΩ

V_out = V

4.Medium

The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±13 V. The inverting amplifier is driven by a sine wave. Find the largest input amplitude V_in,max (peak value) for which the output does not clip.

R₁ = 47 kΩR_f = 100 kΩV_sat = ±13 V

V_in,max = 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 = −0.9 VV₂ = 1 VR₁ = 1 kΩR₂ = 10 kΩR₃ = 10 kΩR₄ = 1 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 = −1.9 VV₂ = 1.5 VR₁ = 47 kΩR₂ = 2 kΩR_f = 1 kΩ

V_out = V

Answer key

1. I_L = 0.2 mA
2. I₁ = 1 mA
3. V_out = 3.8 V
4. V_in,max = 6.11 V
5. V_out = 10 V
6. V_out = −0.7096 V

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