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African Journal of Natural Sciences
This paper presents the design and construction of a dual regulated ±0-35Volts DC power supply that will serve a dual purpose of providing a positive and negative DC output of different values for use in miniaturize electronic appliances such as laptops, TV, and Telephone. It may also be useful in various domestic and laboratory experimental purposes. LM317 and LM337 were used as positive and negative voltage regulators respectively. The circuit was built with preferred values of components with an AC input of 220Vrms, 50Hz that was step down using a designed center tapped transformer (37V 0 37V). The total output power was found to be 272.34W. The total power loss was determined to be 35.66W with an efficiency of 88.42%. The DC voltage transfer functions at the positive and negative terminals were found to be 0.966 and 0.969 respectively. The differences between the voltages of the developed circuit and the designed values were found to be 3.45% at the positive terminal and 3.18% at the negative terminal which was achieved using the percentage error method. This device is useful in an application that uses bi-directional amplifiers and dual power supply such as operational amplifiers mostly found in TV/Radio systems.
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Electrophoresis machine is a machine used in detecting the genotype of human being which basically is AA, AS, SS. This work has successfully demonstrated how different electronic components such as diode, resistors, capacitor can be used to actualize a fascinating output-electrophoresis machine [genotype machine]. Although, these are other ways of realizing the same output such as power source and operation problems. Since, in this part of the world suffer epileptic power supply, maintenance personnel and equality operators of computerized genotype machine that can solve this problems by employing a simple circuit, low voltage power supply and easy to operate mechanism. Therefore this electrophoresis is ideal for third war countries like ours.
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ABSTRACT In the light of prevailing power cuts in the country, there is a sudden rise of a need to come up with backup power solutions. The most common backup supply systems available on the market are Automotive Generator Sets (convert mechanical energy to electrical energy by means of burning fossil fuel) and UPS (Uninterrupted power supply). Even though all these backup supply systems turn to perform their said functions to some extent, they turn to pose some challenges. Some of the limitations of using generator as alternative or additional source of electricity are mostly noisy during its operation, which causes disturbances in the neighborhood. The carbon mono-oxide and the black oil from the generator pose threats to the environment as air and soil or water pollutant making it non-environmentally friendly. The cost of maintenance turns to be expensive since they run on fuel, compared to an Inverter. This makes it quite unaffordable by people with low income. The 600VA DC-AC power inverter is designed to produce backup power that runs on 12V DC batteries which are ecofriendly to produce backup power for a longer period of time. This project would increase the knowledge on power inverter application by constructing a 12V DC to 220V AC with output power rating at 600VA with frequency varying between 49.95Hz, which is approximately 50 Hz. The traditional square wave derived from a stable multi-vibrator would be substituted for modified sine wave oscillator which would be designed by the combination of a timer and a flip-flop. The signal from the flip-flop is fed to a dual input Class AB pull-push amplifier to produce an alternating output with the same waveform but with a higher power enough to power up any equipment in the power rating of the system. The parallel state built by the RFP40N10 (N-Channel Mosfets) is to conduct large amount of power through the primary of the transformer to oscillate thereby generating an output at the secondary of the transformer.
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Beginners introductory courses in Basic Electronics for undergraduates
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