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Comparator as a night switch
- 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