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​ = 0.1 VR1​ = 4.7 kΩI1​

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

Vin = 0.1 VR1 = 4.7 kΩRf = 10 kΩ
I1 = mA
2.Easy
−+Vout​Rf​ = 22 kΩVin​ = 1.6 VR1​ = 4.7 kΩ

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

Vin = 1.6 VR1 = 4.7 kΩRf = 22 kΩ
Vout = V
3.Medium
−+Vout​Rf​ = ?R1​ = 1 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 31.

R1 = 1 kΩAv = 31
Rf = kΩ
4.Medium
−+Vout​Rf​ = ?R1​ = 22 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 8.

R1 = 22 kΩAv = 8
Rf = kΩ
5.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 10 kΩRf1​ = 100 kΩstage 2: non-invertingR2​ = 22 kΩRf2​ = 1 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 = −0.5 V. Find the output voltage Vout.

R1 = 10 kΩRf1 = 100 kΩR2 = 22 kΩRf2 = 1 kΩVin = −0.5 V
Vout = V
6.Hard
−+Vout​Rf​ = 1 kΩV1​ = −1.8 VR1​ = 2 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 = −1.8 VV2 = −0.6 VR1 = 2 kΩR2 = 47 kΩRf = 1 kΩ
If = mA

Answer key

  1. 1. I1 = 0.02128 mA
  2. 2. Vout = −7.489 V
  3. 3. Rf = 30 kΩ
  4. 4. Rf = 154 kΩ
  5. 5. Vout = 5.227 V
  6. 6. If = −0.9128 mA

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