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Physics
Second year
Chapter No: 18
Topics: Comparator as a Night Switch
Teacher: Ameen Soomro
Op-Amp as a Comparator
Potential Divider Circuit
𝑉1 =
𝑅1
𝑅1 + 𝑅2
𝑉𝑐𝑐
𝑉2 =
𝑅2
𝑅1 + 𝑅2
𝑉𝑐𝑐
𝑉𝑐𝑐 = 𝑉1 + 𝑉2
Light Dependent Resistor (LDR)
• A device whose resistance depends on the intensity of light.
• Basically, it is made up of semiconductor.
• In semiconductors
𝑅 𝛼
1
𝑇
i-e When temperature increases, resistance decreases & Vice
Versa.
LDR
Comparator as a Night Switch
𝑉𝑅 =
𝑅2
𝑅1 + 𝑅2
𝑉𝑐𝑐 𝑉′ =
𝑅3
𝑅 𝐿 + 𝑅3
𝑉𝑐𝑐
Time Temp. 𝑅 𝐿 V' Output Voltage 𝑉𝑜
Day High Low Large 𝑉′ > 𝑉𝑅 → 𝑉𝑜 = −𝑉𝑐𝑐
Night Low High Low 𝑉′ < 𝑉𝑅 → 𝑉𝑜 = +𝑉𝑐𝑐
Reference Voltage at (+) input 𝑉′
is the voltage at (-) input
 Light on when 𝑉𝑜 = +𝑉𝑐𝑐
Comparator as a night switch

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Comparator as a night switch

  • 1.
  • 2.
  • 3. Physics Second year Chapter No: 18 Topics: Comparator as a Night Switch Teacher: Ameen Soomro
  • 4. Op-Amp as a Comparator
  • 5. Potential Divider Circuit 𝑉1 = 𝑅1 𝑅1 + 𝑅2 𝑉𝑐𝑐 𝑉2 = 𝑅2 𝑅1 + 𝑅2 𝑉𝑐𝑐 𝑉𝑐𝑐 = 𝑉1 + 𝑉2
  • 6. Light Dependent Resistor (LDR) • A device whose resistance depends on the intensity of light. • Basically, it is made up of semiconductor. • In semiconductors 𝑅 𝛼 1 𝑇 i-e When temperature increases, resistance decreases & Vice Versa. LDR
  • 7. Comparator as a Night Switch 𝑉𝑅 = 𝑅2 𝑅1 + 𝑅2 𝑉𝑐𝑐 𝑉′ = 𝑅3 𝑅 𝐿 + 𝑅3 𝑉𝑐𝑐 Time Temp. 𝑅 𝐿 V' Output Voltage 𝑉𝑜 Day High Low Large 𝑉′ > 𝑉𝑅 → 𝑉𝑜 = −𝑉𝑐𝑐 Night Low High Low 𝑉′ < 𝑉𝑅 → 𝑉𝑜 = +𝑉𝑐𝑐 Reference Voltage at (+) input 𝑉′ is the voltage at (-) input  Light on when 𝑉𝑜 = +𝑉𝑐𝑐