American Journal of Electrical and Electronic Engineering

An attempt is made to design and develop a low cost, simple but efficient instrument to measure the decay time of luminescence in phosphors used in displays. The approach employed here is generally an embedded system designed around an intelligent microcontroller Atmega-16 of Atmale. The system is using a time domain technique of measurement and is further enhanced by developing necessary software for online-offline analysis.

American Journal of Electrical and Electronic Engineering. 2014, 2(6), 180-184. DOI: 10.12691/ajeee-2-6-5
Pub. Date: December 30, 2014

Full-Text PDF

21278 Views6143 Downloads35 Likes1 Citations

New Squaring and Square-rooting Circuits Using Cdba

by J. K. Pathak, A. K. Singh and Raj Senani

Letter To Editor

One new squaring and two new square-rooting circuits based on CDBAs have been introduced. The new squarer circuit consists of a CDBA, two NMOS transistors and one resistor. On the other hand, the first square-rooting circuit consists of two CDBAs, two NMOS transistors while the second square- rooting circuit consists of only a single CDBA, two NMOS transistors and two PMOS transistors. The proposed circuits exhibit wide input voltage range, very small error and offer low output impedance to facilitate easy cascading without requiring additional buffers. PSPICE simulation results are included which confirm the practical workability of the new circuits.

American Journal of Electrical and Electronic Engineering. 2014, 2(6), 175-179. DOI: 10.12691/ajeee-2-6-4
Pub. Date: December 25, 2014

Full-Text PDF

24615 Views5953 Downloads43 Likes1 Citations

Improving Learning in Electronic Engineering through Platform Open Source

by Diez Diez Ángela, Ricardo Gago, Carlos Fernández, Miguel Ferrero and Ramón Angel Fernández

Original Research

In this study, the main objective is to present an initiative on the Grade students of the School of Industrial Engineering and Informatics, University of León. We have applied the methodology of teaching that allows enhance the interest of students for their own learning. The working method has been organizing workshops that employ strategies of project-based learning and group projects. These projects are limited in time and with a high degree of involvement by the student. There has also been an information system which supports communication and work with all of the workshop participants. For the development of this experiment, we used a microcontroller system as open source Arduino (1). This platform allows improving the teaching of electronic and automatic concepts in a simple and easy way to apply.

American Journal of Electrical and Electronic Engineering. 2014, 2(6), 171-174. DOI: 10.12691/ajeee-2-6-3
Pub. Date: December 22, 2014

Full-Text PDF

17289 Views5116 Downloads36 Likes

Physical Substantiation of Huygens Principle and the Reciprocity Theorem

by F. F. Mende

Original Research

The Huygens principle says, that each element of wave front can be examined as the center of the second disturbance, which generates second spherical waves, and the resulting light field at each point of space will be determined by the interference of these waves. This principle is the basic postulate of geometric optics; however, it does not reveal physical nature of this phenomenon. Are examined the laws of the self-induction of such reactive elements as capacity and inductance, which made possible to base the physical bases of Huygens's principle. It is shown that with the connection to the sources of direct current and voltage they have the effective resistance, which depends on the time. Is examined the parametric self-induction of the elements indicated and it is shown that in the regime of parametric self-induction the capacity and inductance can not only derive energy from the power sources, but also return it into the external circuits. The new method of determining the velocity of propagation of constant stresses and currents in the long lines is developed. This task cannot be solved, using standard wave equations for the long lines. The physical special features of the work of the receiving directional Yagi antennas are examined and it is shown that the reciprocity theorem for such antennas is not carried out.

American Journal of Electrical and Electronic Engineering. 2014, 2(6), 165-170. DOI: 10.12691/ajeee-2-6-2
Pub. Date: December 11, 2014

Full-Text PDF

13875 Views3954 Downloads35 Likes

DVCC Based K.H.N. Biquadratic Analog Filter with Digitally Controlled Variations

by Bilal Arif, Mohd. Usama Ismail and Ale Imran

Original Research

In this paper, a digitally controlled single input multi output current-mode K.H.N. Biquad Filter is presented. The filter circuit is composed of three DVCCs together with four grounded resistors and two grounded capacitors. The digital control is incorporated using a current-summing network (CSN). Tuning of resonant frequency is carried out by 3–bit digital control word. Block by block replacement has been done to observe the change in the relationship between resonant frequency of the band-pass filter with the control word. The filter circuit showed three different variations when the DVCC blocks were replaced (one by one) with 3-bit DC-DVCC blocks. PSPICE simulations using TSMC 0.25 micron CMOS technology have been performed to validate the theoretical results.

American Journal of Electrical and Electronic Engineering. 2014, 2(6), 159-164. DOI: 10.12691/ajeee-2-6-1
Pub. Date: November 30, 2014

Full-Text PDF

24608 Views8044 Downloads37 Likes