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​ = ?Vin​R1​ = 2.2 kΩ

An inverting amplifier with an ideal op-amp must have a voltage gain of −2.5. The input resistor is R1 = 2.2 kΩ. Find the feedback resistor Rf.

Av = −2.5R1 = 2.2 kΩ
Rf = kΩ
2.Easy
−+Vout​Rf​ = 47 kΩVin​R1​ = ?

An inverting amplifier with an ideal op-amp must have a voltage gain of −5. The feedback resistor is Rf = 47 kΩ. Find the input resistor R1.

Av = −5Rf = 47 kΩ
R1 = kΩ
3.Medium
−+Vout​R2​ = 2 kΩV1​ = 0.7 VR1​ = 1 kΩV2​ = 1.3 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 = 0.7 VV2 = 1.3 VR1 = R3 = 1 kΩR2 = R4 = 2 kΩ
Vout = V
4.Medium
−+Vout​Rf​ = ?R1​ = 10 kΩVin​

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

R1 = 10 kΩAv = 15
Rf = kΩ
5.Hard
−+Vout​Rf​ = 1 kΩV1​ = −1 VR1​ = 100 kΩV2​ = −1.9 VR2​ = 10 kΩ

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

V1 = −1 VV2 = −1.9 VR1 = 100 kΩR2 = 10 kΩRf = 1 kΩ
Vout = V
6.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 47 kΩRf1​ = 47 kΩstage 2: non-invertingR2​ = 10 kΩRf2​ = 22 kΩ

Two ideal op-amp stages are connected in cascade: an inverting amplifier (R1, Rf1) followed by a non-inverting amplifier (R2 to ground, Rf2 in the feedback). Both run from ±15 V supplies. The input is Vin = −0.15 V. Find the output voltage Vout.

R1 = 47 kΩRf1 = 47 kΩR2 = 10 kΩRf2 = 22 kΩVin = −0.15 V
Vout = V

Answer key

  1. 1. Rf = 5.5 kΩ
  2. 2. R1 = 9.4 kΩ
  3. 3. Vout = 1.2 V
  4. 4. Rf = 140 kΩ
  5. 5. Vout = 0.2 V
  6. 6. Vout = 0.48 V

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