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 6 V source with an internal resistance R_s = 22 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 = 6 VR_s = 22 kΩR_L = 4.7 kΩ

I_L = mA

2.Easy

The circuit is an inverting amplifier. The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±12 V. Find the output voltage V_out.

V_in = 1.3 VR₁ = 2 kΩR_f = 10 kΩV_sat = ±12 V

V_out = V

3.Medium

Choose the feedback resistor R_f that gives this non-inverting amplifier a voltage gain of 3.

R₁ = 2 kΩA_v = 3

R_f = kΩ

4.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 = 2.1 VV₂ = 2.8 VR₁ = R₃ = 47 kΩR₂ = R₄ = 100 kΩ

V₋ = V

5.Hard

The integrator uses an ideal op-amp with ±15 V supplies; its output saturates at ±12 V. The capacitor is uncharged when a constant input V_in = −1.6 V is applied at t = 0. Find the output voltage V_out at t = 10 ms.

V_in = −1.6 VR = 1 kΩC = 2.2 µFV_sat = ±12 Vt = 10 ms

V_out = V

6.Hard

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

V₁ = 0.2 VV₂ = −0.2 VR₁ = 22 kΩR₂ = 2 kΩR_f = 47 kΩ

V_out = V

Answer key

1. I_L = 1.277 mA
2. V_out = −6.5 V
3. R_f = 4 kΩ
4. V₋ = 1.905 V
5. V_out = 7.273 V
6. V_out = 4.273 V

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