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​ = 22 kΩVin​ = −0.3 VR1​ = 1 kΩ

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

Vin = −0.3 VR1 = 1 kΩRf = 22 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = 22 kΩVin​R1​ = ?

An inverting amplifier with an ideal op-amp must have a voltage gain of −2. The feedback resistor is Rf = 22 kΩ. Find the input resistor R1.

Av = −2Rf = 22 kΩ
R1 = kΩ
3.Medium
−+Vout​R2​ = 10 kΩV1​ = −2.2 VR1​ = 100 kΩV2​ = 1.9 VR3​ = 100 kΩR4​ = 10 kΩ

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 = −2.2 VV2 = 1.9 VR1 = R3 = 100 kΩR2 = R4 = 10 kΩ
V− = V
4.Medium
−+Vout​Rf​ = ?R1​ = 1 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 10.

R1 = 1 kΩAv = 10
Rf = kΩ
5.Hard
−+Vout​C = 0.47 µFVin​ = 0.5 VR = 2.2 kΩ

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 Vin = 0.5 V is applied at t = 0. Find the output voltage Vout at t = 2 ms.

Vin = 0.5 VR = 2.2 kΩC = 0.47 µFVsat = ±13 Vt = 2 ms
Vout = V
6.Hard
−+Vout​Rf​ = 22 kΩV1​ = 1.6 VR1​ = 22 kΩV2​ = −1.4 VR2​ = 47 kΩIf​

The summing amplifier uses an ideal op-amp with ±15 V supplies. Find the current If through the feedback resistor, flowing towards the output.

V1 = 1.6 VV2 = −1.4 VR1 = 22 kΩR2 = 47 kΩRf = 22 kΩ
If = mA

Answer key

  1. 1. Vout = 6.6 V
  2. 2. R1 = 11 kΩ
  3. 3. V− = 0.1727 V
  4. 4. Rf = 9 kΩ
  5. 5. Vout = −0.9671 V
  6. 6. If = 0.04294 mA

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