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Jurnal Teknik Elektro
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Core Subject : Engineering,
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Articles 5 Documents
Search results for , issue " Vol 10, No 2 (2018): Jurnal Teknik Elektro" : 5 Documents clear
Perbandingan Efisiensi Daya Penguat Audio Kelas AB dengan Penguat Audio Kelas D untuk Keperluan Sound System Lapangan Kharis, Muhamad; Prastiyanto, Dhidik; Suryono, Suryono
Jurnal Teknik Elektro Vol 10, No 2 (2018): Jurnal Teknik Elektro
Publisher : Jurusan Teknik Elektro, Fakultas Teknik, Universitas Negeri Semarang

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Abstract

Class AB audio amplifiers are commonly used but the efficiency is 50%. While the efficiency of class D audio amplifiers is 90% but are rarely used. The purpose of this research is to know how much the power efficiency of field sound system between 1000 watts class AB amplifier and 900 watts class D amplifier. This study is a comparative study that compares different variables with the same sample. The results of power efficiency are obtained from the percentage comparison between the output power and the input power of each audio amplifier. The power efficiency of class D audio amplifiers with IRS D900 type larger than class AB audio amplifiers with Apex B500 type. The efficiency value of class D audio amplifiers at the highest output power reaches 87% while class AB audio amplifiers are only 73%.
Implementasi Algoritma Kalkulasi Interupsi pada Rancang Bangun Tachometer Digital Maria, Putut Son; Susianti, Elva
Jurnal Teknik Elektro Vol 10, No 2 (2018): Jurnal Teknik Elektro
Publisher : Jurusan Teknik Elektro, Fakultas Teknik, Universitas Negeri Semarang

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Abstract

Tachometer is an important tool for measuring the rotational speed of electro-mechanical machines and other rotating objects. In a closed-loop system, it should have a mechanism by which sensory instruments must be able to produce and deliver feedback values that can be fetched by the controller. Most commercial tachometers do not have such data communication features, making it difficult to be employed in closed loop systems. This study aims to develop a tachometer which is programmed using calculation on interrupt-based algorithm and has data communication capabilities as well. The algorithm was designed over the minimum features of a microcontroller chip, namely a timer and interrupt. The proposed algorithm that was tested on the prototype results good performance for the typical electro-mechanical machines with a measurement error range between 0.1 and 1.2%. The equation for the calculation of rotation per minute (rpm) has also been revised to provide a more valid formula.
Rancang Bangun Antena Bowtie pada Video Sender sebagai Pemancar TV Streaming Bestari, Nabila Shaffa; Wagyana, Agus
Jurnal Teknik Elektro Vol 10, No 2 (2018): Jurnal Teknik Elektro
Publisher : Jurusan Teknik Elektro, Fakultas Teknik, Universitas Negeri Semarang

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Abstract

A streaming television usually broadcasted through internet and can be watched on computer or mobile phone. However it can also be seen through television using video sender as the transmitter. To transmit it, of course, a suitable antenna is needed, in this case a bowtie antenna is selected. This research describe the design of a bowtie antenna that will be used as a transmitter antenna on a video sender. This bowtie antenna is designed by using an aluminum plate works on frequency of 655 MHz and has a return loss value of -21.127 dB, VSWR 1.192, 5.11 dB gain and bi-directional radiation pattern. The analysis process is carried out by analyzing the data taken from the audio and video results received in television as well as data from the measurement of signal strength captured by Register Transfer Level Software Define Radio (RTL SDR) and dipole antennas. Measurement results will be displayed in the sdrSharp software. The results of this measurement will be associated with field strength which is related to television signals. This bowtie antenna can transmit audio and video up to 30 m and has an average field strength value in Line of Sight (LOS) conditions of 120.3208 dBμV / m and at Non Line of Sight (NLOS) conditions of 123.5014 dBμV / m which is in accordance with the field strength standard in Indonesia that regulated in Perkominfo No. 31 Tahun 2014 which is above 70 dBμV / m in band V.
Smart Riders 3D Sebagai Game Pengenalan Rambu Lalu Lintas Berbasis Android Sulastianingsih, Febri; Kartono, R.
Jurnal Teknik Elektro Vol 10, No 2 (2018): Jurnal Teknik Elektro
Publisher : Jurusan Teknik Elektro, Fakultas Teknik, Universitas Negeri Semarang

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Abstract

Android smartphone, one of the entertainment media that is used by many people for games. Besides being an entertainment media, games can be used as educational media, such as the introduction of traffic signs. Knowledge of traffic signs on motorists influences the occurrence of traffic accidents. Therefore, the introduction of traffic signs is one of the efforts in controlling traffic. This is because knowledge of traffic signs is currently lacking. In this study, it will present the making of a Smart Rider application that aims to introduce traffic signs to prospective drivers and drivers of motorized vehicles. The software development method used is Waterfall, which includes communication, planning, modeling, construction and deployment. Application testing uses material testing, functionality, usability and portability. Usability testing is done by media experts and users. Users in this study were taken from Kebumen Vocational High School 1 students. From the results of testing the application as a whole, shows that the application has a good function. The test results can be seen from the material test reaching 94.4%, the user response reached 78.74%, and the results of testing by media experts reached 87.5%. Thus, the Smart Rider application is declared feasible to be used as a game for introducing Android-based traffic signs.
Implementasi Enkripsi Data Secure Hash Algorithm (SHA-256) dan Message Digest Algorithm (MD5) pada Proses Pengamanan Kata Sandi Sistem Penjadwalan Karyawan Sulastri, Santi; Putri, Riana Defi Mahadji
Jurnal Teknik Elektro Vol 10, No 2 (2018): Jurnal Teknik Elektro
Publisher : Jurusan Teknik Elektro, Fakultas Teknik, Universitas Negeri Semarang

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Abstract

There are various types of encryption that can be used, for example MD5 and SHA-256. However, using  MD5 or SHA-256 alone is not safe enough because it can be solved by using a brute force attack. The method of working is very simple is to try all possible combinations. This study aims to develop MD5 and SHA256 collaboration methods. Encryption is applied to the user's password on the web login system. Simulation results can be tested by measuring resistance to brute force attacks and the value of the avalanche effect (AE). From the results of the tests carried out by using attack software, the results of the application are quite safe from brute force attacks. From the AE test obtained the result with an AE value of 71% which means that the encoding result is good enough.

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