Troubleshooting of AM Converter Circuit

Engineeering Projects
am converter troubleshooting

In this section we are going to analyze and troubleshoot the AM converter circuit. the converter, also known as autodyne circuit, is a combination of the local oscillator and the mixer in a single stage. We are also going to discuss the power supply and audio amplifier problems in this section Upon completing this section, you should be able to Troubleshoot an AM converter circuit Identify an open input circuit Identify a dead or intermittent local oscillator circuit Identify causes for a dead and intermittent local oscillator Troubleshoot the receiver’s…

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CCTV Switcher Circuit using Timer IC 555

Engineeering Projects
cctv switcher circuit using 555 ic

Here is a simple project CCTV Switcher circuit using timer IC 555 and decade counter IC 4017. The basic function of this project is to switch between different CCTV cameras sequentially i.e. one CCTV output is displayed on TV at a time. A CCTV (Closed Circuit Telephone) camera is used for video surveillance by using a video camera. Sometimes one CCTV camera is not sufficient for surveillance entire area thus we have to use multiple cameras to cover the entire area of surveillance. The circuit posted here control four CCTV…

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Arduino and RFID based Door Access System

Engineeering Projects
arduino and rfid based door opening system

The project Arduino and RFID-based Door Access System is basically an access control system and can be placed where authorized entry is compulsion like office, school, etc. Previously in bestengineeringprojects.com, we had already posted RFID based security system using microcontroller AT89C52 which is used to open the door and Arduino and RFID Based Attendance Systems for taking attendance. Working of RFID Module | Arduino and RFID based Door Access System RFID (Radio Frequency identification) basically use an electromagnetic field to detect unique tag assigned to object in the vicinity. An RFID…

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Assembly Program to Find Vowel in String | 8086

Engineeering Projects

Here is the program to find the number of vowel in string written in assembly language. This program display the number of vowels in string and also total number of string without vowel in a clear screen with reverse attributes Assembly Program to Find Vowel in String | 8086 //8086 PROGRAM F8-01A.ASM Program: .MODEL SMALL .STACK 64 .DATA MAXCHAR DB 60; ACTCHAR DB ?; STR DB 60 DUP (?); VOWEL_NO DB 0; NEWLN DB 0DH,0AH,”$”; CHECK STR DB 65, 69, 73, 79, 85, 97, 101, 105, 111, 117; {A, B,…

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TV | FM Antenna Installation

Engineeering Projects
matching antenna to receiver

TV and FM antenna installation practices will be preferred to throughout this discussion. Installing TV and FM antennas portrays fairly standard practices that should be followed when doing any kind of communications antennas installation. Never neglect safety. Standard operation procedure should always make safety first on the list of things to do. Locate power lines, telephone lines, and obstacles that could interface with the installation or present a hazard to the installers. A tower structure would require a concrete base as the supporting structure. Guy wires need room for proper…

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Top 10 Arduino Projects 2017

Engineeering Projects
top 10 arduino projects

Here we had complied a list of top 10 Arduino Project 2017 that would be cool, useful and efficient to design in free time. Before talking about the list of 10 awesome project using arduino we would like to clear some point about arduino board. So, what is Arduino? | Top 10 Arduino Projects 2017 Arduino is an open-source design consist a microcontroller and all the necessary circuitry on a signal board. A USB plug is given to communicate between computer and arduino board. The programming is done in Arduino Programming…

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How to Test Crystal Oscillator

Engineeering Projects
testing of crystal oscillator

Here is the procedure of testing crystal oscillator, oscillator capacitor and oscillator inductor. In a previous article we had posted a circuit called universal crystal oscillator tester for testing crystal oscillator. Now we had posted simple method which is summarize in few point on How to Test Crystal Oscillator below. An oscillator with a bad crystal may not oscillate at all, may be erratic, or may not oscillate at the correct frequency. One common crystal failure mode is a broken or corroded internal connection. Or if the crystal has been dropped,…

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Accident Detection and Alert System using Arduino

Engineeering Projects
author prototype of accident detection system

Today in this article we are going to build a project called Accident Detection and Alert System using Arduino UNO, GSM module, GPS module, and Vibration Sensor Module. The vibration sensor module used in this project is used to detect the change in linear velocity, displacement, or acceleration. The GPS module detects the exact location (longitude and latitude) and the GSM module is used to send all information to the mobile number assigned in the software code. You may also like the Car Lock System using Arduino and GSM modules.…

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Problem and Troubleshooting of Power Supply

Engineeering Projects
switching power supply troubleshooting

Power supply has a considerable role in electronic communications equipment. The power supply furnishes the voltage and current requirements for electronics circuit operation. Special high-voltage power supplies used in microwave systems and laser systems enable large power handling tubes and semiconductor circuits to operate. In this section, we are going to look at popular types of power supply circuits and some faults that can occur in them. In this section, we’ll also learn to troubleshoot a traveling wave tube amplifier. Improper operating of a TWT can nearly always be traced…

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Sound Activated 0-30 Minutes Timer Circuit

Engineeering Projects
30 minutes timer circuit using 555

The project “Sound Activated 0-30 Minutes Timer Circuit” is a simple project designed using timer IC 555 and LM324 Quad op-amp IC. By using this project, one can activate or de-activate the appliance using sound, and the time delay can be adjusted from a few seconds to 30 minutes. Application: The applications of the project Sound Activated 0-30 Minutes Timer Circuit are: Used as a sound-activated burglar alarm. Used as timer circuit in kitchen, house. used for appliance operations like refrigerators, TV, Rice-cooker, etc. by adjusting the time as per…

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