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​ = −0.9 VR1​ = 1 kΩI1​

The op-amp is ideal and runs from ±15 V supplies. Find the current I1 through R₁, flowing towards the op-amp.

Vin = −0.9 VR1 = 1 kΩRf = 10 kΩ
I1 = mA
2.Easy
−+Vout​Rf​ = 47 kΩVin​ = 0.7 VR1​ = 22 kΩ

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

Vin = 0.7 VR1 = 22 kΩRf = 47 kΩ
Vout = V
3.Medium
−+Vout​Rf​ = ?R1​ = 4.7 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 3.

R1 = 4.7 kΩAv = 3
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 15.

R1 = 4.7 kΩAv = 15
Rf = kΩ
5.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 4.7 kΩRf1​ = 4.7 kΩstage 2: non-invertingR2​ = 2 kΩRf2​ = 10 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 = 0.6 V. Find the output voltage Vout.

R1 = 4.7 kΩRf1 = 4.7 kΩR2 = 2 kΩRf2 = 10 kΩVin = 0.6 V
Vout = V
6.Hard
−+Vout​Rf​ = 22 kΩV1​ = −0.3 VR1​ = 2 kΩV2​ = −0.1 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 = −0.3 VV2 = −0.1 VR1 = 2 kΩR2 = 22 kΩRf = 22 kΩ
If = mA

Answer key

  1. 1. I1 = −0.9 mA
  2. 2. Vout = −1.495 V
  3. 3. Rf = 9.4 kΩ
  4. 4. Rf = 65.8 kΩ
  5. 5. Vout = −3.6 V
  6. 6. If = −0.1545 mA

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