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​ = −0.5 VR1​ = 2 kΩ

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

Vin = −0.5 VR1 = 2 kΩRf = 47 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = 22 kΩVin​ = 1.9 VR1​ = 2 kΩ

The circuit is an inverting amplifier. The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±13 V. Find the output voltage Vout.

Vin = 1.9 VR1 = 2 kΩRf = 22 kΩVsat = ±13 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 25.

R1 = 22 kΩAv = 25
Rf = kΩ
4.Medium
−+Vout​Rf​ = ?R1​ = 4.7 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 11.

R1 = 4.7 kΩAv = 11
Rf = kΩ
5.Hard
−+Vout​Rf​ = 4.7 kΩV1​ = −1.2 VR1​ = 22 kΩV2​ = −0.1 VR2​ = 100 kΩ

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

V1 = −1.2 VV2 = −0.1 VR1 = 22 kΩR2 = 100 kΩRf = 4.7 kΩ
Vout = V
6.Hard
−+Vout​Rf​ = 4.7 kΩV1​ = 2 VR1​ = 4.7 kΩV2​ = −0.6 VR2​ = 47 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 = 2 VV2 = −0.6 VR1 = 4.7 kΩR2 = 47 kΩRf = 4.7 kΩ
If = mA

Answer key

  1. 1. Vout = 11.75 V
  2. 2. Vout = −13 V
  3. 3. Rf = 528 kΩ
  4. 4. Rf = 47 kΩ
  5. 5. Vout = 0.2611 V
  6. 6. If = 0.4128 mA

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