This will reduce wear and tear of the motor and save electricity too. Coolers are used at many homes, offices, schools, and industries, especially in summers, so this device will come handy to stop the cooler pump automatically when the cooler's tank has no water.
The author's prototype is shown in Fig. 1 and its circuit diagram is shown in Fig. 2. The circuit comprises stepdown transformer X1, bridge rectifier BR1, 5V voltage regulator LM7805 (IC1), decade counter 4017 (IC2), rectifier diode 1N4007 (D1), signal diode 1N4148 (D2-D5), NPN transistor 2N2219 (T1), 5V single changeover relay, and a few other components.
The 5V DC supply required for the circuit is derived from 230V AC to 9V, 500mA step-down transformer X1. The 230V AC mains is connected to primary winding of X1 via CON1 in the circuit. The secondary winding of X1 produces 9V AC, which is connected to bridge rectifier BR1 for rectification and to capacitor C1 for filtration. The rectified and filtered voltage is given to regulator IC LM7805 (IC1) to get regulated 5V for the circuit, whose presence is confirmed by the glowing of LED1.
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Denne historien er fra July 2023-utgaven av Electronics For You.
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TRULY INNOVATIVE ELECTRONICS -INNOVATION UPDATES
Amongst numerous press releases of new products received by us, these are the ones we found worthy of the title Truly Innovative Electronics
Elastomer enhancing smart wearable performance
A high-tech, flexible wearable device made from the innovative elastomer material
Nanotechnology based noninvasive cancer diagnostics
Nanoflake sensors built from indium oxide with platinum and nickel detect changes in isoprene
Space communication with silent amplifiers
In the new communication system from researchers at Chalmers University of Technology, in Sweden, a weak optical signal (red) from the spacecraft's transmitter can be amplified noisefree when it encounters two so-called pump waves (blue and green) of different frequencies in a receiver on Earth.
Advancements in TOPCon solar cells
The structure and performance of tandem devices with highly passivated TOPCon bottom cells
Quantum leap in magnetism refines superconductors
Rice University physicists have uncovered key magnetic and electronic properties in kagome magnets, structures resembling basket-weaving patterns.
Sensor targets food antioxidants
A research team from Hunan City University and Xiangtan University in China has developed a sensor for detecting TBHQ, a food antioxidant used in oils and fats, addressing health concerns at high concentrations.
Data sensing with repurposed RFID tags
UC San Diego researchers have advanced passive data collection with a breakthrough in battery-free sensing.
Seal-inspired sensors to safeguard offshore wind farms
Schematic structure of the seal whisker-inspired flow sensors
Artificial nose identifies scents accurately
Artificial nose identifies scents accurately
