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​ = 1.1 VR1​ = 2 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 = 1.1 VR1 = 2 kΩRf = 47 kΩVsat = ±12 V
Vout = V
2.Easy
−+Vout​Rf​ = 47 kΩVin​ = 0.4 VR1​ = 4.7 kΩ

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

Vin = 0.4 VR1 = 4.7 kΩRf = 47 kΩ
Vout = V
3.Medium
−+Vout​R2​ = 10 kΩV1​ = −1.1 VR1​ = 22 kΩV2​ = 0.3 VR3​ = 22 kΩR4​ = 10 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 = −1.1 VV2 = 0.3 VR1 = R3 = 22 kΩR2 = R4 = 10 kΩ
Vout = V
4.Medium
−+Vout​Rf​ = ?R1​ = 1 kΩVin​

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

R1 = 1 kΩAv = 20
Rf = kΩ
5.Hard
−+Vout​Rf​ = 47 kΩV1​ = −1.1 VR1​ = 47 kΩV2​ = 1.2 VR2​ = 4.7 kΩ

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

V1 = −1.1 VV2 = 1.2 VR1 = 47 kΩR2 = 4.7 kΩRf = 47 kΩ
Vout = V
6.Hard
−+Vout​Rf​ = 22 kΩV1​ = −0.5 VR1​ = 10 kΩV2​ = 0.7 VR2​ = 2 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 = 0.7 VR1 = 10 kΩR2 = 2 kΩRf = 22 kΩ
If = mA

Answer key

  1. 1. Vout = −12 V
  2. 2. Vout = −4 V
  3. 3. Vout = 0.6364 V
  4. 4. Rf = 19 kΩ
  5. 5. Vout = −10.9 V
  6. 6. If = 0.3 mA

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