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​ = 0.3 VR1​ = 1 kΩ

The circuit is an inverting amplifier. The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±12 V. Find the output voltage Vout.

Vin = 0.3 VR1 = 1 kΩRf = 47 kΩVsat = ±12 V
Vout = V
2.Easy
−+Vout​Rf​ = 4.7 kΩVin​ = −0.9 VR1​ = 1 kΩ

The circuit is an inverting amplifier. The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±14 V. Find the output voltage Vout.

Vin = −0.9 VR1 = 1 kΩRf = 4.7 kΩVsat = ±14 V
Vout = V
3.Medium
−+Vout​Rf​ = ?R1​ = 22 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 20.

R1 = 22 kΩAv = 20
Rf = kΩ
4.Medium
−+Vout​Rf​ = 4.7 kΩR1​ = 2 kΩVin​ = 0.8 V

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

Vin = 0.8 VR1 = 2 kΩRf = 4.7 kΩ
Vout = V
5.Hard
−+Vout​R2​ = 1 kΩV1​ = 1.2 VR1​ = 4.7 kΩV2​ = −2 VR3​ = 47 kΩR4​ = 4.7 kΩ

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

V1 = 1.2 VV2 = −2 VR1 = 4.7 kΩR2 = 1 kΩR3 = 47 kΩR4 = 4.7 kΩ
Vout = V
6.Hard
−+Vout​Rf​ = 22 kΩV1​ = −0.3 VR1​ = 10 kΩV2​ = −0.1 VR2​ = 47 kΩ

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

V1 = −0.3 VV2 = −0.1 VR1 = 10 kΩR2 = 47 kΩRf = 22 kΩ
Vout = V

Answer key

  1. 1. Vout = −12 V
  2. 2. Vout = 4.23 V
  3. 3. Rf = 418 kΩ
  4. 4. Vout = 2.68 V
  5. 5. Vout = −0.4758 V
  6. 6. Vout = 0.7068 V

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