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​ = 1 kΩ

An inverting amplifier with an ideal op-amp must have a voltage gain of −8. The input resistor is R1 = 1 kΩ. Find the feedback resistor Rf.

Av = −8R1 = 1 kΩ
Rf = kΩ
2.Easy
−+Vout​Rf​ = 10 kΩVin​ = 0.2 VR1​ = 4.7 kΩ

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

Vin = 0.2 VR1 = 4.7 kΩRf = 10 kΩ
Vout = V
3.Medium
−+Vout​R2​ = 4.7 kΩV1​ = 1.3 VR1​ = 10 kΩV2​ = 0.3 VR3​ = 10 kΩR4​ = 4.7 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 = 1.3 VV2 = 0.3 VR1 = R3 = 10 kΩR2 = R4 = 4.7 kΩ
Vout = V
4.Medium
−+Vout​Rf​ = ?R1​ = 1 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 6.

R1 = 1 kΩAv = 6
Rf = kΩ
5.Hard
−+Vout​Rf​ = 1 kΩV1​ = −0.2 VR1​ = 4.7 kΩV2​ = 0.4 VR2​ = 1 kΩ

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

V1 = −0.2 VV2 = 0.4 VR1 = 4.7 kΩR2 = 1 kΩRf = 1 kΩ
Vout = V
6.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 4.7 kΩRf1​ = 10 kΩstage 2: non-invertingR2​ = 100 kΩRf2​ = 47 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. Find the overall voltage gain Av = Vout/Vin.

R1 = 4.7 kΩRf1 = 10 kΩR2 = 100 kΩRf2 = 47 kΩ
Av =

Answer key

  1. 1. Rf = 8 kΩ
  2. 2. Vout = −0.4255 V
  3. 3. Vout = −0.47 V
  4. 4. Rf = 5 kΩ
  5. 5. Vout = −0.3574 V
  6. 6. Av = −3.128

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