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​ = 100 kΩVin​R1​ = ?

An inverting amplifier with an ideal op-amp must have a voltage gain of −4. The feedback resistor is Rf = 100 kΩ. Find the input resistor R1.

Av = −4Rf = 100 kΩ
R1 = kΩ
2.Easy
−+Vout​Rf​ = 100 kΩVin​ = 0.5 VR1​ = 22 kΩI1​

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

Vin = 0.5 VR1 = 22 kΩRf = 100 kΩ
I1 = mA
3.Medium
−+Vout​Rf​ = 47 kΩR1​ = 1 kΩVin​ = −0.1 V

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

Vin = −0.1 VR1 = 1 kΩRf = 47 kΩ
Vout = V
4.Medium
−+Vout​R2​ = 1 kΩV1​ = 0.2 VR1​ = 2 kΩV2​ = 1.7 VR3​ = 2 kΩR4​ = 1 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 = 0.2 VV2 = 1.7 VR1 = R3 = 2 kΩR2 = R4 = 1 kΩ
Vout = V
5.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 1 kΩRf1​ = 2 kΩstage 2: non-invertingR2​ = 4.7 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 = −0.95 V. Find the output voltage Vout.

R1 = 1 kΩRf1 = 2 kΩR2 = 4.7 kΩRf2 = 1 kΩVin = −0.95 V
Vout = V
6.Hard
−+Vout​Rf​ = 47 kΩV1​ = 1.2 VR1​ = 10 kΩV2​ = 0.9 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 = 1.2 VV2 = 0.9 VR1 = 10 kΩR2 = 47 kΩRf = 47 kΩ
If = mA

Answer key

  1. 1. R1 = 25 kΩ
  2. 2. I1 = 0.02273 mA
  3. 3. Vout = −4.8 V
  4. 4. Vout = 0.75 V
  5. 5. Vout = 2.304 V
  6. 6. If = 0.1391 mA

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