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 = 22 kΩ. It feeds a load R_L = 2.2 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 = 1 VR_s = 22 kΩR_L = 2.2 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 = −0.4 VR₁ = 10 kΩR_f = 100 kΩ

V_out = V

3.Medium

The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±14 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 = 4.7 kΩR_f = 100 kΩV_sat = ±14 V

V_in,max = V

4.Medium

Choose the feedback resistor R_f that gives this non-inverting amplifier a voltage gain of 51.

R₁ = 100 kΩA_v = 51

R_f = kΩ

5.Hard

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

V₁ = 1.4 VV₂ = −1 VR₁ = 4.7 kΩR₂ = 100 kΩR_f = 22 kΩ

V_out = V

6.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 = 1.1 VR₁ = 22 kΩR₂ = 47 kΩR₃ = 4.7 kΩR₄ = 22 kΩ

V_out = V

Answer key

1. V_L = 0.09091 V
2. V_out = 4 V
3. V_in,max = 0.658 V
4. R_f = 5000 kΩ
5. V_out = −6.333 V
6. V_out = 0.92 V

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