Study of active crossover network

Tyona,; Akande, Sfa

doi:10.4314/njphy.v20i2.45994

Cited by 1 publication

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“…At the bridge rectifier, there is a voltage drop of 1.4 V because each diode uses 0.7 V when conducting and there are always two diodes conducting (Hewes 2011). The smoothing capacitor, C1 is determined by (Tyona and Akande 2008, Schuler 1999, VRIOG steering committee 2009 where C = smoothing capacitance in farads (F) I o = output current from the supply in amps (A) ̴ 2A V s = supply voltage in volts (V), this is the peak value of the unsmoothed DC, 8.6V RMS f = frequency of the AC supply in hertz (Hz), 50 Hz in Nigeria. Thus F C  22000  .…”

Section: The DC Power Supplymentioning

confidence: 99%

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A comprehensive study of spin coating as a thin film deposition technique and spin coating equipment

Tyona¹

2013

Advances in materials Research

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Description and theory of spin coating technique has been elaborately outlined and a spin coating machine designed and fabricated using affordable components. The system was easily built with interdisciplinary knowledge of mechanics, fluid mechanics and electronics. This equipment employs majorly three basic components and two circuit units in its operation. These include a high speed dc motor, a proximity sensor mounted at a distance of about 15 mm from a reflective metal attached to the spindle of the motor to detect every passage of the reflective metal at its front and generate pulses. The pulses are transmitted to a micro-controller which process them into rotational speed (revolution per minute) and displays it on a lead crystal display (LCD) which is also a component of the micro-controller. The circuit units are a dc power supply unit and a PWM motor speed controlling unit. The various components and circuit units of this equipment are housed in a metal casing made of an 18 gauge black metal sheet designed with a total area of 1, 529.2 cm 2. To illustrate the use of the spin-coating system, ZnO sol-gel films were prepared and characterized using SEM, XRD, UV-vis, FT-IR and RBS and the result agrees well with that obtained from standard equipment and a speed of up to 9000 RPM has been achieved.

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Section: The DC Power Supplymentioning

confidence: 99%

“…Filtering or smoothing significantly increases the average DC voltage to almost the peak value (1.4 × RMS value); that is, the filtered output is 1.4 × 8.6 = 12.04 V DC (Tyona and Akande 2008, Hewes 2011, Holt 1978.…”

Section: The DC Power Supplymentioning

confidence: 99%

A comprehensive study of spin coating as a thin film deposition technique and spin coating equipment

Tyona¹

2013

Advances in materials Research

View full text Add to dashboard Cite

show abstract

Study of active crossover network

Cited by 1 publication

References 0 publications

A comprehensive study of spin coating as a thin film deposition technique and spin coating equipment

A comprehensive study of spin coating as a thin film deposition technique and spin coating equipment

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