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
−+Vout​Rf​ = 47 kΩVin​ = −0.1 VR1​ = 2 kΩ

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

Vin = −0.1 VR1 = 2 kΩRf = 47 kΩ
Vout = V
2.Easy
−+Vout​3.5 VRs​ = 47 kΩRL​1 kΩIL​

A sensor behaves like a 3.5 V source with an internal resistance Rs = 47 kΩ. It feeds a load RL = 1 kΩ through an ideal voltage follower (unity-gain buffer). Find the load current IL supplied by the op-amp output.

Vs = 3.5 VRs = 47 kΩRL = 1 kΩ
IL = mA
3.Medium
−+Vout​Rf​ = ?R1​ = 1 kΩVin​

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

R1 = 1 kΩAv = 51
Rf = kΩ
4.Medium
−+Vout​R2​ = 2 kΩV1​ = −0.3 VR1​ = 1 kΩV2​ = −2.2 VR3​ = 1 kΩR4​ = 2 kΩ

The difference amplifier uses an ideal op-amp with ±15 V supplies, with R3 = R1 and R4 = R2. Find the output voltage Vout.

V1 = −0.3 VV2 = −2.2 VR1 = R3 = 1 kΩR2 = R4 = 2 kΩ
Vout = V
5.Hard
−+Vout​C = 0.47 µFVin​ = −0.7 VR = 2.2 kΩ

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 Vin = −0.7 V is applied at t = 0. Find the output voltage Vout at t = 1 ms.

Vin = −0.7 VR = 2.2 kΩC = 0.47 µFVsat = ±12 Vt = 1 ms
Vout = V
6.Hard
−+Vout​R2​ = 10 kΩV1​ = −1.7 VR1​ = 2 kΩV2​ = 1.1 VR3​ = 47 kΩR4​ = 2 kΩ

The op-amp is ideal and runs from ±15 V supplies. The resistor ratios are not matched. Find the output voltage Vout.

V1 = −1.7 VV2 = 1.1 VR1 = 2 kΩR2 = 10 kΩR3 = 47 kΩR4 = 2 kΩ
Vout = V

Answer key

  1. 1. Vout = 2.35 V
  2. 2. IL = 3.5 mA
  3. 3. Rf = 50 kΩ
  4. 4. Vout = −3.8 V
  5. 5. Vout = 0.677 V
  6. 6. Vout = 8.769 V

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