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​ = 22 kΩVin​ = 2 VR1​ = 4.7 kΩ

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

Vin = 2 VR1 = 4.7 kΩRf = 22 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = ?Vin​R1​ = 10 kΩ

An inverting amplifier with an ideal op-amp must have a voltage gain of −8. The input resistor is R1 = 10 kΩ. Find the feedback resistor Rf.

Av = −8R1 = 10 kΩ
Rf = kΩ
3.Medium
−+Vout​Rf​ = 4.7 kΩR1​ = 1 kΩVin​

The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±12 V. The non-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 = 1 kΩRf = 4.7 kΩVsat = ±12 V
Vin,max = V
4.Medium
−+Vout​Rf​ = ?R1​ = 100 kΩVin​

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

R1 = 100 kΩAv = 6
Rf = kΩ
5.Hard
−+Vout​Rf​ = 47 kΩV1​ = 0.2 VR1​ = 2 kΩV2​ = −0.6 VR2​ = 47 kΩ

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

V1 = 0.2 VV2 = −0.6 VR1 = 2 kΩR2 = 47 kΩRf = 47 kΩ
Vout = V
6.Hard
−+Vout​Rf​ = 100 kΩV1​ = 0.1 VR1​ = 22 kΩV2​ = −0.1 VR2​ = 10 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 = 0.1 VV2 = −0.1 VR1 = 22 kΩR2 = 10 kΩRf = 100 kΩ
If = mA

Answer key

  1. 1. Vout = −9.362 V
  2. 2. Rf = 80 kΩ
  3. 3. Vin,max = 2.105 V
  4. 4. Rf = 500 kΩ
  5. 5. Vout = −4.1 V
  6. 6. If = −0.005455 mA

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