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​ = ?Vin​R1​ = 22 kΩ

An inverting amplifier with an ideal op-amp must have a voltage gain of −2.5. The input resistor is R1 = 22 kΩ. Find the feedback resistor Rf.

Av = −2.5R1 = 22 kΩ
Rf = kΩ
2.Easy
−+Vout​6.5 VRs​ = 4.7 kΩRL​1 kΩ

A sensor behaves like a 6.5 V source with an internal resistance Rs = 4.7 kΩ. It feeds a load RL = 1 kΩ through an ideal voltage follower (unity-gain buffer). For comparison, find the load voltage VL if the load were connected directly to the sensor without the buffer.

Vs = 6.5 VRs = 4.7 kΩRL = 1 kΩ
VL = V
3.Medium
−+Vout​Rf​ = 10 kΩR1​ = 10 kΩVin​ = 1.2 V

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

Vin = 1.2 VR1 = 10 kΩRf = 10 kΩ
Vout = V
4.Medium
−+Vout​Rf​ = 22 kΩVin​R1​ = 1 kΩ

The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±12 V. The inverting amplifier is driven by a sine wave. Find the largest input amplitude Vin,max (peak value) for which the output does not clip.

R1 = 1 kΩRf = 22 kΩVsat = ±12 V
Vin,max = V
5.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 10 kΩRf1​ = 10 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. Find the overall voltage gain Av = Vout/Vin.

R1 = 10 kΩRf1 = 10 kΩR2 = 4.7 kΩRf2 = 1 kΩ
Av =
6.Hard
−+Vout​Rf​ = 22 kΩV1​ = −0.8 VR1​ = 22 kΩV2​ = 1.9 VR2​ = 10 kΩ

The summing amplifier uses an ideal op-amp with ±15 V supplies. Find the output voltage Vout.

V1 = −0.8 VV2 = 1.9 VR1 = 22 kΩR2 = 10 kΩRf = 22 kΩ
Vout = V

Answer key

  1. 1. Rf = 55 kΩ
  2. 2. VL = 1.14 V
  3. 3. Vout = 2.4 V
  4. 4. Vin,max = 0.5455 V
  5. 5. Av = −1.213
  6. 6. Vout = −3.38 V

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