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​ = 4.7 kΩVin​ = 1.9 VR1​ = 2 kΩ

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

Vin = 1.9 VR1 = 2 kΩRf = 4.7 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = 10 kΩVin​ = −1.2 VR1​ = 2 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 = −1.2 VR1 = 2 kΩRf = 10 kΩVsat = ±14 V
Vout = V
3.Medium
−+Vout​Rf​ = ?R1​ = 2 kΩVin​

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

R1 = 2 kΩAv = 10
Rf = kΩ
4.Medium
−+Vout​Rf​ = ?R1​ = 47 kΩVin​

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

R1 = 47 kΩAv = 20
Rf = kΩ
5.Hard
−+Vout​Rf​ = 22 kΩV1​ = −0.8 VR1​ = 47 kΩV2​ = 0.5 VR2​ = 100 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 = −0.8 VV2 = 0.5 VR1 = 47 kΩR2 = 100 kΩRf = 22 kΩ
If = mA
6.Hard
−+Vout​R2​ = 10 kΩV1​ = 1.7 VR1​ = 4.7 kΩV2​ = 0.5 VR3​ = 10 kΩR4​ = 10 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 = 0.5 VR1 = 4.7 kΩR2 = 10 kΩR3 = 10 kΩR4 = 10 kΩ
Vout = V

Answer key

  1. 1. Vout = −4.465 V
  2. 2. Vout = 6 V
  3. 3. Rf = 18 kΩ
  4. 4. Rf = 893 kΩ
  5. 5. If = −0.01202 mA
  6. 6. Vout = −2.835 V

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