Offline UPS Circuit

Engineeering Projects
inverter section and changeover section

Introduction to Offline UPS Circuit We all know that most electrical and electronic appliances are solely powered by the AC supply and the problem arises when the power is cut off in the middle or there is no power at all. In such cases, uninterrupted supplies are what we look out for. This is one of those uninterrupted power supply circuits. The fact that it provides an instant power supply from the batteries than standby generators that take long to operate, makes it more practical. To make the use of…

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Sinewave Feedback L-C Oscillators

Engineeering Projects
tuned base oscillator circuit

Popular sinewave feedback L-C tuned oscillators are listed below. These are principally used for generating RF oscillations. Tuned Collector Oscillator Tuned Based Oscillator Hartley Oscillation Colpitts Oscillator Clapp Oscillator Crystal Oscillator Tuned Collector Oscillator Figure 1 gives the basic circuit. A parallel tuned L-C circuit placed in the collector circuit constitutes the load impedance and determines the frequency of oscillation. The output voltage developed across the tuned circuit is inductively coupled to the basic circuit through the coil L2. The winding direction of the two coils L1 and L2 are…

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Battery Status Indicator Circuit

Engineeering Projects
under charged condition

Here is a simple circuit using transistor called ‘Battery Status Indicator Circuit’ used to indicate two states of battery i.e. under charged and over charged. Previously, we had already posted similar circuit called Battery Voltage State Indicator using 741 used to indicate three states of battery i.e. charged, charging and discharge. Similarly, you can also design  circuit which indicate status of battery in 10 different level. Circuit Description of Battery Status Indicator The circuit of Battery Status Indicator Capacitor is shown in figure 1. The main components of Battery State…

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3.7V to 5V, 5.3V and 6V Converter Circuit

Engineeering Projects
3.7v to 5v converter circuit

3.7V to 5V, 5.3V, and 6V Converter Circuit: The preferred voltage levels while working in most electronics projects lie between the value 5V to 6V. However, 3.6V-3.7V batteries are found abundantly in the market with a cheap price tag. So, we presented an economic solution to generate commonly used operating voltages i.e. 5V, 5.3V, and 6V using these cheap and easily available 3.6V and 3.7V batteries. Using two-three batteries of 3.6V (3.6*2=7.2V) and 3.7V (3.7*2=7.4V) doesn’t provide the desired voltage level and thus this project was essential. This DC-to-DC converter…

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Dynamic Microphone Pre-amplifier Circuit

Engineeering Projects
circuit diagram of dynamic microphone pre amplifier

While flowing up the discussion on bestengineeringprojects.com, one of our readers ask about a dynamic microphone pre-amplifier. The dynamic microphone pre-amplifier circuit is a bit different than other microphone pre-amplifier circuits because it consists two-stage amplifier section. Thus, before going through the circuit description we would like to make clear the dynamic microphones. What is Dynamic Microphone? A dynamic microphone is a transducer that converts the sound signal into an electrical signal and works on the electromagnetic induction principle because it contains a moving coil. This microphone is also called…

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Audio Signal Tracer Schematic

Engineeering Projects
dual audio signal tracer schematic

Signal transmission can be quite troublesome sometimes. To ensure that the signal is passed through a defined distance, here we have presented an “Audio Signal Tracer Schematic”.  As mentioned in the title; ‘Audio Signal Tracer Schematic’, this project is implemented to troubleshoot audio signals transmission in electronic circuits and radio, etc. It comprises two loudspeakers being Audio Signal Tracer and is packaged into a small hand-held test probe. The only power source required by the circuit is a battery and thus is more useful. Amplitude-modulated signals can also be detected…

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Top 10 Electronics Mini Projects using IC 555

Engineeering Projects
electronics mini projects using ic555

Here we had compiled a list of the top 10 Electronics mini projects using IC 555 that would be cool, useful, and efficient to design in free time. Before listing the top ten electronics mini projects using IC 555 we would like to clear some points like operating voltage, temperature, applications, etc. of timer IC. So, what is timer IC 555? Timer IC 555 is a powerful timing circuit that is popular for the production of accurate and stable time delay or oscillation. It is much reliable, easy to use,…

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GPS Module Interface with ATmega16

Engineeering Projects
circuit diagram of gps interface with atmega16

Currently, in the market, a large number of GPS projects are distributed. You might be wondering what is different here? Well, the GPS receiver we are talking about is solely based on AVR- microcontroller. The project collects information from the satellite and so is more practical than other systems that demand wireless network connections as cellphones or Internet to operate. This GPS receiver system is a boon to remote areas and can be used as a base to work in other research areas. It works with the satellite to track…

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ESP8266 Temperature Logger using PIC16F887

Engineeering Projects
ESP8266 Temperature Logger using PIC16F887

The project ESP8266 Temperature Logger using PIC16F887 is built up using a PIC16F887 microcontroller (MCU), ESP8266 WiFi module, and a ThingSpeak API. Previously, we posted Arduino and ESP8266-based webservers and this project is somehow similar. Introduction to ESP8266 Temperature Logger using PIC16F887 Here is a PIC16F887 microcontroller and ESP8266-based temperature logging system. The project; ‘ESP8266 Temperature Logger using PIC16F887 monitor’s the temperature of the vicinity simultaneously and provides details of the information collected. Well, the project also incorporates a modern concept; ThingSpeak which ensures safe storage and retrieval of data from…

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Elementary Database Management System using C

Engineeering Projects

Here is a menu driven program for elementary database management system using C. There is a provision to Add, Modify, List and Delete records, the operations that are imperative in any database management. Following comments would help you in understand the program easily: Addition of record must always take place at the end of existing records in the file, much in the same way you would add new records in a register manually. Listing records means displaying the existing record on the screen. Naturally, record should be listed from first…

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