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​5 VRs​ = 2.2 kΩRL​2.2 kΩIL​

A sensor behaves like a 5 V source with an internal resistance Rs = 2.2 kΩ. It feeds a load RL = 2.2 kΩ through an ideal voltage follower (unity-gain buffer). Find the load current IL supplied by the op-amp output.

Vs = 5 VRs = 2.2 kΩRL = 2.2 kΩ
IL = mA
2.Easy
−+Vout​Rf​ = 220 kΩVin​R1​ = ?

An inverting amplifier with an ideal op-amp must have a voltage gain of −8. The feedback resistor is Rf = 220 kΩ. Find the input resistor R1.

Av = −8Rf = 220 kΩ
R1 = kΩ
3.Medium
−+Vout​Rf​ = 4.7 kΩR1​ = 2 kΩVin​ = 0.3 V

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

Vin = 0.3 VR1 = 2 kΩRf = 4.7 kΩ
Vout = V
4.Medium
−+Vout​Rf​ = ?R1​ = 10 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 21.

R1 = 10 kΩAv = 21
Rf = kΩ
5.Hard
−+Vout​R2​ = 22 kΩV1​ = 1.3 VR1​ = 10 kΩV2​ = −0.2 VR3​ = 4.7 kΩR4​ = 4.7 kΩ

The op-amp is ideal and runs from ±15 V supplies. The resistor ratios are not matched. Find the output voltage Vout.

V1 = 1.3 VV2 = −0.2 VR1 = 10 kΩR2 = 22 kΩR3 = 4.7 kΩR4 = 4.7 kΩ
Vout = V
6.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 1 kΩRf1​ = 1 kΩstage 2: non-invertingR2​ = 100 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 = 0.75 V. Find the output voltage Vout.

R1 = 1 kΩRf1 = 1 kΩR2 = 100 kΩRf2 = 1 kΩVin = 0.75 V
Vout = V

Answer key

  1. 1. IL = 2.273 mA
  2. 2. R1 = 27.5 kΩ
  3. 3. Vout = 1.005 V
  4. 4. Rf = 200 kΩ
  5. 5. Vout = −3.18 V
  6. 6. Vout = −0.7575 V

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