Price : INR 330.00
During summer seasons, we all us knows the need of coolers. If cooler is on for long time, then the requirement of water is also very large. To minimize this problem to a large extent cooler timer is designed. Cooler Timer controls the ON and OFF time of cooler water pump according to the user’s requirement. The minimum and maximum time setting is fraction of second and one-and-a-half minute respectively. Our valued clients can avail Cooler Timer in different specifications.
About the Circuit :
Cooler Timer is designed using popular timer IC named as IC1. The circuit facilitates time adjustment of both charged and discharged states of the relay. IC1 is used is a stable mode. When power is ON, capacitor C3 starts charging via R1/VR2/R2 and on time of pump starts. When its voltage reaches to 2/3Vcc, it starts discharging via R2/VR1/R1. Now, OFF time of pump starts and when its voltage reaches to a value less than 1/3Vcc, it starts charging again and procedure repeats again. At the output of IC1 at pin3, on and off pulses are obtained. During on time transistor T1 turns ON, relay connected at the collector terminal energizes, and in turns pump becomes on. During off pulse, T1 turns off and relay becomes off which in turn makes pump off.
Separate delays for charged and discharged states of the relay are achieved by using two diodes (D1 and D2) and two preset VR1 and VR2 between pins 2 and 7 of the IC1. The preset VR1 and VR2 provide control over the ‘on’ and ‘off’ stages of the relay, respectively.
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