After 20 seconds, its pin 5 turns high and triggers the relay driver transistor T1. When the light level in the room drops below the preset level, IC1 starts oscillating. VR1 adjust the resetting of IC at the particular light level in the room, say around 6 pm. This keeps the reset pin 12 of IC1 high and the IC remains off without oscillating. During day light, LDR has less resistance and it conducts. Circuit WorkingĪn LDR is used as the light sensor to detect the darkness around 6 pm. Here a circuit is demonstrated which automatically switches off the fridge during this peak period and switches it on after two and half hours, thus enabling the saving of energy. Hence it is most appropriate to switch off the fridge during these peak hours. Generally the power consumption by the domestic refrigerator is quite large during peak hours from 6 pm to 9 pm and is much more on low voltage lines. The supply voltage start at 12V when supply is ON then slowly goes down. The relay will turn ON after the end of the count period and stay on so long as power is supplied to the circuit. When the supply is ON then transistors T1 and T2 are activated, then supply voltage is slowly goes to low. – the relay can turn ON when power and counting start then turn OFF after the count period, or – it can do the opposite. The output from the 4060 goes to a transistor switch arrangement. Variable resistor R1 can be adjusted to get different time delays. The IC4060 is a 14- stage binary ripple counter which generates the basic time delay pulses. Video on Long Duration Timer Circuit Diagram
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