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

The op-amp is ideal and runs from ±15 V supplies. Find the current I₁ through R₁, flowing towards the op-amp.

V_in = 1.7 VR₁ = 1 kΩR_f = 2 kΩ

I₁ = mA

2.Easy

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 = 47 kΩ

V_out = V

3.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 = 4.7 kΩR_f = 22 kΩV_sat = ±13 V

V_in,max = V

4.Medium

Choose the feedback resistor R_f that gives this non-inverting amplifier a voltage gain of 15.

R₁ = 100 kΩA_v = 15

R_f = kΩ

5.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 = 0.35 V. Find the output voltage V_out.

R₁ = 4.7 kΩR_f1 = 22 kΩR₂ = 47 kΩR_f2 = 4.7 kΩV_in = 0.35 V

V_out = V

6.Hard

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

V₁ = 1.2 VV₂ = 2 VR₁ = 22 kΩR₂ = 10 kΩR_f = 22 kΩ

V_out = V

Answer key

1. I₁ = 1.7 mA
2. V_out = −4.059 V
3. V_in,max = 2.777 V
4. R_f = 1400 kΩ
5. V_out = −1.802 V
6. V_out = −5.6 V

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