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​ = 10 kΩVin​ = −1.7 VR1​ = 4.7 kΩ

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

Vin = −1.7 VR1 = 4.7 kΩRf = 10 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = 100 kΩVin​ = 1.6 VR1​ = 4.7 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 = 1.6 VR1 = 4.7 kΩRf = 100 kΩVsat = ±12 V
Vout = V
3.Medium
−+Vout​R2​ = 1 kΩV1​ = −2 VR1​ = 4.7 kΩV2​ = 0.7 VR3​ = 4.7 kΩR4​ = 1 kΩ

The difference amplifier uses an ideal op-amp with ±15 V supplies, with R3 = R1 and R4 = R2. Find the voltage V− at the inverting input.

V1 = −2 VV2 = 0.7 VR1 = R3 = 4.7 kΩR2 = R4 = 1 kΩ
V− = V
4.Medium
−+Vout​Rf​ = ?R1​ = 10 kΩVin​

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

R1 = 10 kΩAv = 20
Rf = kΩ
5.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 2 kΩRf1​ = 22 kΩstage 2: non-invertingR2​ = 10 kΩRf2​ = 2 kΩ

Two ideal op-amp stages are connected in cascade: an inverting amplifier (R1, Rf1) followed by a non-inverting amplifier (R2 to ground, Rf2 in the feedback). Both run from ±15 V supplies. The input is Vin = −0.4 V. Find the output voltage Vout.

R1 = 2 kΩRf1 = 22 kΩR2 = 10 kΩRf2 = 2 kΩVin = −0.4 V
Vout = V
6.Hard
−+Vout​Rf​ = 10 kΩV1​ = 0.9 VR1​ = 47 kΩV2​ = 0.3 VR2​ = 22 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 = 0.9 VV2 = 0.3 VR1 = 47 kΩR2 = 22 kΩRf = 10 kΩ
If = mA

Answer key

  1. 1. Vout = 3.617 V
  2. 2. Vout = −12 V
  3. 3. V− = 0.1228 V
  4. 4. Rf = 190 kΩ
  5. 5. Vout = 5.28 V
  6. 6. If = 0.03279 mA

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