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 −4. The input resistor is R1 = 1 kΩ. Find the feedback resistor Rf.

Av = −4R1 = 1 kΩ
Rf = kΩ
2.Easy
−+Vout​Rf​ = 100 kΩVin​ = −1 VR1​ = 47 kΩ

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

Vin = −1 VR1 = 47 kΩRf = 100 kΩ
Vout = V
3.Medium
−+Vout​R2​ = 4.7 kΩV1​ = 0.8 VR1​ = 10 kΩV2​ = −1.6 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 = 0.8 VV2 = −1.6 VR1 = R3 = 10 kΩR2 = R4 = 4.7 kΩ
Vout = V
4.Medium
−+Vout​Rf​ = 4.7 kΩVin​R1​ = 2 kΩ

The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±13 V. The inverting amplifier is driven by a sine wave. Find the largest input amplitude Vin,max (peak value) for which the output does not clip.

R1 = 2 kΩRf = 4.7 kΩVsat = ±13 V
Vin,max = V
5.Hard
−+Vout​Rf​ = 1 kΩV1​ = −0.5 VR1​ = 2 kΩV2​ = −0.3 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 = −0.5 VV2 = −0.3 VR1 = 2 kΩR2 = 100 kΩRf = 1 kΩ
If = mA
6.Hard
−+Vout​Rf​ = 4.7 kΩV1​ = 1.3 VR1​ = 10 kΩV2​ = 0.1 VR2​ = 22 kΩ

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

V1 = 1.3 VV2 = 0.1 VR1 = 10 kΩR2 = 22 kΩRf = 4.7 kΩ
Vout = V

Answer key

  1. 1. Rf = 4 kΩ
  2. 2. Vout = 2.128 V
  3. 3. Vout = −1.128 V
  4. 4. Vin,max = 5.532 V
  5. 5. If = −0.253 mA
  6. 6. Vout = −0.6324 V

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