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 7 V source with an internal resistance R_s = 47 kΩ. It feeds a load R_L = 10 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 = 7 VR_s = 47 kΩR_L = 10 kΩ

V_L = V

2.Easy

An inverting amplifier with an ideal op-amp must have a voltage gain of −20. The feedback resistor is R_f = 22 kΩ. Find the input resistor R₁.

A_v = −20R_f = 22 kΩ

R₁ = kΩ

3.Medium

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

R₁ = 10 kΩA_v = 15

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 output voltage V_out.

V₁ = 0.1 VV₂ = 1.1 VR₁ = R₃ = 4.7 kΩR₂ = R₄ = 1 kΩ

V_out = V

5.Hard

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

V₁ = 1.9 VV₂ = −1.3 VR₁ = 47 kΩR₂ = 1 kΩR_f = 4.7 kΩ

V_out = V

6.Hard

The integrator uses an ideal op-amp with ±15 V supplies; its output saturates at ±13 V. The capacitor is uncharged when a constant input V_in = 1 V is applied at t = 0. How long after t = 0 does the output reach saturation? Find t.

V_in = 1 VR = 10 kΩC = 0.22 µFV_sat = ±13 V

t = ms

Answer key

1. V_L = 1.228 V
2. R₁ = 1.1 kΩ
3. R_f = 140 kΩ
4. V_out = 0.2128 V
5. V_out = 5.92 V
6. t = 28.6 ms

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