How to Make 10V DC Power Supply (PCB included)

Hi friends, in this short tutorial we are going to learn how to make 10V DC power supply using LM350 IC. You can use this circuit as your first or second year engineering electronics mini project. This circuit is capable of producing 10V DC output at a current rating of maximum 3A. It uses LM350, a three terminal positive voltage regulator. It can produce an output voltage ranging from 1.2V to 33V for the input voltage of 14V to 24 V obtained from the AC mains through a step-down transformer. The capacitor C2 ensures the stability of the output from the regulator. To get different levels of the output voltage, the values of R2 and C3 can be varied accordingly.

Components required

  • C1 = 0.1uF
  • C2 = 1uF
  • C3 = 10uF
  • D1,D2,D3,D4 = IN5001
  • F1 = 3A
  • J1,J2 are screw terminals
  • R1 = 240Ω
  • R2 = 1.65K
  • U1 = LM350

Circuit diagram

10V DC Power Supply
10V DC Power Supply

Download: You can download PCB Scematics here: 10V DC power supply

Features of 10V DC Power Supply

Input(V): 14VAC to 24VAC
Output(V): 10 VDC
Output load: 3A

Note: Use a ccl with 2oz Cu thickness for PCB fabrication.

This article is written by Heknath B Vicky. You can also submit your article and can earn 1$ per article. For more details click here.

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Interfacing 433MHz RF Modules with 8051 Microcontroller

Hello Friends Today I am going to show you how to use a 433MHz RF module in your 8051 Projects. The 433MHz RF module is one of the cheapest ways of wireless communication other than IR that you can use in your 8051 projects.There is a receiving and Transmitting module that we will need. You can easily find them online for3-4$(150-200 Indian Rs).

Components required

  • Microcontroller (P89V51RD2) (2)
  • Resistor 10K (1)
  • Capacitor 33pF (2)
  • Capacitor 10uF (1)
  • 11.0592MHz Crystal (1)
  • 433MHz RF Transmitter (1)
  • 433MHz RF Receiver (1)
  • Buzzer(optional) (1)

Circuit Diagram and Description

Receiving circuit
Receiving circuit
Transmitting Circuit
Transmitting Circuit

Connections of the Transmitter Module:

The smaller module of the two with a crystal on it is the Transmitter module. The Pin connections for the module are as below

Pin on Module            Connection

GND               GND on 8051 Board

DATA             P3.1 on 8051 Board

Vcc                  Vcc on 8051 Board

ANT                Connected to 17.25cm long wire

Connections for the Receiver Module:

The Larger module of the two is the Receiver module.The Module has multiple GND and Vcc pins which need to be connected externally. The Pin connections for the module are as below

Pin on Module            Connection

GND              GND on 8051 Board

DATA            P3.0 on 8051 Board

Vcc                 Vcc on 8051 Board

ANT               Connected to 17.25cm long wire

About the Program

In this particular program, we are using UART to transmit 8-bit data over the RF module. The data pin of the transmit module is connected to the transmit pin of the 8051. When the Switch 4 is pressed on the 8051 Board then the ASCII value of character t is sent over the RFmodule.If this is received at the receiving 8051 then the Buzzer will turn on for 5 Seconds.

Download: Click here to download the C, Assembly and Hex file.

This article is written by Aditya Wani.

I hope you liked this microcontroller project. If you have any queries feel free to ask in the comment section below. Like our facebook page and subscribe to our newsletter for future updates. Hava a nice day!

How to make 1 Amp Power Supply – Mini Project

Hi friends, today we are going to build a 1A power supply, which will power your projects and save money on batteries. It is suitable as an adjustable power supply for your projects. you can use this current supply for driving DC motors, low voltage bulbs, etc. So let’s start.

Specifications of 1A power supply:

We are going to build a 1A power supply such that it will have maximum benefits and specifications to the user. Our 1A power supply circuit will have following specifications:

  1. Preset voltage range: 1.5V to 35V
  2. Maximum input voltage: 28V AC or 40V DC
  3. Maximum dissipation: 15W
  4. Short circuit protection
  5. Thermal and overload protection

For different output voltage, we need to choose a specific transformer. Following table shows how to select right transformer.

Choose right transformer
Choose right transformer

Components required:

  1. Diodes: D1, D2, D3, D4 = 1N4007
  2. Resistor: R1=120Ω
  3. Potentiometer: RV1=4.7KΩ
  4. Capacitors: C1=0.1μF (104)
  5. Electrolytic capacitors: C2=1μF, C3=10μF, C4=2200μF
  6. Voltage regulator: VR1= LM317
  7. SK1 and SK2 are terminal box.

Circuit Diagram:

1A Power Supply Circuit Diagram
1A Power Supply Circuit Diagram


Build the circuit as shown in circuit diagram. Connect the AC signal of the transformer (output of transformer) at SK1. Set the desired output voltage by the use of RV1 potentiometer. Mount voltage regulator LM317 along with heat sink if you are using high power application.

I hope you liked this circuit. Feel free to ask your queries in the comment section below. Like our facebook page and subscribe to our newsletter for future updates. Have a nice day!

How to make Metal Detector – Final Year Project

Hi friends, today we are going to build a very useful circuit which is Metal Detector. We all know about Metal Detector equipment which is widely used at security points. Same kind of Metal Detector we are going to build today. Our circuit is more powerful which can detect the presence of metal inside walls. If you want to drill a hole in walls, we can use this Metal Detector to check if there is any metal pipe like gas pipeline or water pipes, etc.

Features of Metal Detector:

  1. Detection Range: 8 cm (3″ approx.)
  2. Power supply: 9V Battery
  3. Power consumption: 30mA max.
  4. Output form: LED or/and Buzzer

Components required:

  1. Coils: It consists of two windings around the ferrite core. Winding L1 has 120 turns and winding L2 has 43 turns. We are using copper wire having 0.3mm thickness.
  2. Diode (D1): 1N4148
  3. Zener diode (ZD1): 3V9
  4. Resistors: R1=330Ω, R2=R3=470Ω, R4=2.7KΩ, R5=10KΩ
  5. Capacitors: C1=1200pF or 3300pF, C2=47nF
  6. Transistors: T1=T2=T3=BC547B
  7. LED (LD1): 5mm red
  8. Trim potentiometers: RV1= 2.5KΩ, RV2=100Ω
  9. Push button SW1

Circuit Diagram of Metal Detector:

Metal detector circuit diagram
Metal detector circuit diagram

Test and Adjustments:

  1. Connect a 9V battery to the circuit.
  2. Keep the circuit where there is no metal in the vicinity.
  3. Turn preset RV1 fully clockwise.
  4. Turn RV2 fully anti-clockwise.
  5. Depress the push button and hold it during the final adjustments.
  6. Now turn RV1 anti-clockwise till red LED goes out.
  7. Now turn RV2 clockwise until the red LED weakly lit.
  8. Now when metal comes in the vicinity of circuit red LED will be more brightly lit.

You can observe that we have one buzzer in the circuit. This buzzer is optional. If you want the output of the circuit in the form of a buzzer, you can connect the buzzer as shown in the diagram.

I hope you liked this article. If you have any queries, feel free to ask in the comment section below. Like our facebook page and subscribe to our newsletter for future updates.

Sound Activated LED Kit – Mini Project

Hi friends, today we are going to build another interesting electronic circuit which is sound activated LED kit. We can use this circuit for sound indicator applications or sound to the light unit in the music application. This project is also useful for hearing-impaired people. By use of this circuit, doorbell sound or phone ring sound produces light indications and thus hearing-impaired people can also perform a particular action.

Sound Activated LEDs

This circuit requires simple electronic components which you can easily find in any electronic components shop. There are no any expensive components in its circuitry, hence it’s a low-cost mini project. You can build this project for your second or third year engineering submissions. Let us build sound activated LED circuit step by step.


  1. Resistors:
    10KΩ: (R1)
    330KΩ: (R2)
    100KΩ: (R3, R4, R5)
    47Ω: (R6, R7, R8, R9)
    1.5MΩ: (R10, R11, R12)
    47KΩ: (R13, R14)
  2. LED: 5mm (LD1, LD2, LD3, LD4)
  3. Transistors: BC547 (T1, T2, T3) and BC557 (T4)
  4. Capacitor: 100nF (C1, C2, C3) and 100μF (C4)
  5. Potentiometer: 220K (RV1)
  6. MIC1

Circuit Diagram:

Sound Activated LED
Sound Activated LEDs Kit


As shown in the circuit diagram of sound activated LEDs, we have used a 220K potentiometer. The sensitivity of this circuit can be varied by using this potentiometer. We have used a built-in microphone (M300) for sensing the sound waves.

Power consumption for this circuit is near around 0.5mA min./12mA max. It requires a 8 to 15V DC power supply. You can also use a 9V DC battery.

Features of Sound activated LED kit:

  1. Intermediate level
  2. Power consumption: 0.5mA min./12mA max.
  3. It has adjustable sensitivity
  4. Require small area for installation
  5. low cast and effective circuitry

I hope you liked this sound activated LED Kit. Try to build your own and let me know if you found any difficulties in it. Please share your comments below. Like our facebook page and subscribe to our newsletter for future updates. Have a nice day!

How To Build Home Made Electric Fan Regulator – Mini Project

Hi friends, in this article we will see one simple mini project for electronics and electrical engineering students. We all are familiar with electric fan regulator which we use for varying the fan speed. The basic principle behind regulator is change of resistance.

This article is written by: Mohamed Maricar & Modified by: Mayuresh Joshi

Cheap and Best Electrical Fan Regulator

Electric Fan Regulator
Fig (A): shows the full view of connection diagram of the product
Fig (B): shows full view of the product and external side
Fig (C): shows the PCB without resistance


Components required:

  1. One Resistance = Rs. 0.15
  2. 28 Resistances = Rs.4.20
  3. One PCB = Rs.5.00
  4. One Rotator Switch = Rs. 8.00
  5. One Plastics Cabinet = Rs.5.00
    Total Cost = Rs. 22.20 Rupees Only

Steps to build electric fan regulator:

  1. First we have to take PCB as shown in Fig (C)
  2. Then we put the Resistance and solder in PCB holes as shown in fig(A)
  3. Now we connect PCB ends with rotator switch as in fig (A)
  4. We connect rotator switch with ac supply
  5. Now if we vary the rotator switch we can get the different speed of motor
    1. The Resistance network is used to drop the voltages in five steps that is level
    2. The first step 13 volts dropped second steps 26 v third step 39v fourth step 53v
    3. By dropping the five levei used to vary the speed of motor
    4. By dropping voltages we can vary the speed of electrical fan motor
  • What is my idea?
    My idea is to design a new circuit to reduce the cost and increase the performance of the product
  • What does it do?
    It regulate the speed of electric fan motor by dropping a.c. voltage in different level
  • How does it works?
    It is working by Ohms law and circuit theory principles
  • What makes my idea Unique?
    Cheap and best

Advantages of my product

  1. Cheap cost
  2. Low care
  3. Low power loss
  4. Low heat loss
  5. Good performance

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Accidental Vehicle Lifting Robot – Mini Project

Nowadays number of road accidents increasing frequently. Whenever vehicle accident occurs on the road there may be high possibility of traffic. In such cases if we could able to move that accidental vehicle from road, we can easily avoid the traffic. To make this possible we can built an accidental vehicle lifting robot using embedded system. You can built its prototype using small vehicle which you can easily found in toy store.

Accidental Vehicle Lifting Robot

Accidental Vehicle Lifting Robot

Working of Accidental Vehicle Lifting Robot

The working of this project is based on microcontroller which is connected to a motor to move the accidental vehicle. Also microcontroller is connected to a chain based rod to lift the vehicle.

The complete circuitry of this project contains microcontroller board which has robotic platform, keypad, electric motors to move the vehicles and lifting the chain based rod. These motors will be moved accordingly to the instruction given through keys connected to microcontroller.

Components required:


  • AT89c52
  • Robot platform
  • Driver circuit
  • Motor for lifting
  • Controlling keys
  • 12 v battery


  • Embedded ‘C’
  • RIDE/KEIL to write code
  • ISP to burn the chip

Advantages Accidental Vehicle Lifting Robot:

  • Low cost
  • automated operation
  • Low Power consumption

I hope you liked this project idea. Please like our facebook page and subscribe to our newsletter for upcoming projects. If you have any queries feel free to ask in comment section below. Have a nice day!

Sending SMS from No Signal Area – Mini Project

Hi friends, in previous article we have seen Zigbee and GPS project which tracks a vehicle. Today we will build another innovative electronic project which will send a SMS from No Signal Area. There are many locations where we get poor range or completely no range. So using this embedded system we can send a SMS from such locations. The only condition we need here is, we should have a mobile network at the receiving end of Zigbee module.

This is low cost project and highly innovative. You can build such projects for your final year engineering submissions also.

Sending SMS from No Signal Area


The main objective of this micocontroller project is to send a SMS from No Signal area which is also known as Black Spot area using Zigbee and GSM module.



  1. 8051 family development board
  2. power Supply
  3. Zigbee modules
  4. GSM modem.
  5. Max232


  1. Embedded ‘C’
  2. RIDE to write code
  3. ISP to burn the chip

Block Diagrams:

Zigbee Transmitter Block Diagram

Sending SMS from No Signal Area Transmitter Block Diagram

Zigbee Receiver Block Diagram

Sending SMS from No Signal Area Receiver Block Diagram

Power Supply:

Power Supply


As already stated, this project is useful for creating signal, using GSM module we can send SMS through that signal to destination. In this project we are using two different frequencies. Zigbee has frequency 2.4GHz and GSM has frequency 1800 MHz.

Main circuitry of this project contains two embedded development boards. One contain Zigbee and Keypad and other contain Zigbee and GSM. We need to place first board in No signal (Black spot) area. Other development board which contains Zigbee receiver and GSM module is kept in area where there is mobile network.

When you type a message using keyboard and hit enter from No signal area, Zigbee transmitter will send a signal with message to the receiver end. Receiver end of Zigbee also has GSM module which will send that SMS to destination mobile.

Watch this Video:

I hope you liked this Project. Please share it with your friends and like our facebook page for future updates. If you have any queries please feel free to ask in comment section below. Have a nice day!


Vehicle Tracking Using Microcontroller & GPS Module

Hi friends, In this project we are going to make a Vehicle tracking system using 8051 microcontroller and GPS module. You can use this project for you final year submissions which cost you around 2500Rs. This is quite interesting and useful project in our day to day life.

We can easily tack lost vehicle using this Vehicle tracking GPS module. In this project we are using 8051 microcontroller, GPS module to track the vehicle location. This system will send a location of vehicle in the form of longitude and latitude values. If you enhance this project you can also easily track the position of vehicle in the graphical presentation on your PC.

Vehicle Tracking Using Microcontroller and GPS Module


The main objective behind developing this project is to track the vehicle position using microntroller GPS module & Zigbee module along with software to see the track of vehicle on PC.

Block Diagrams:

1) Connecting GPS with ZigBee:

Connecting GPS and Zigbee

2) Vehicle Tracking Block Diagram:

Vehicle Tracking Block Diagram

3) Power supply for Vehicle Tracking Circuit:

Power Supply


In this project we using AVL technology. AVL stands for Automatic Vehicle Location. AVL is an advanced method to track and monitor any vehicle which is connected with Vehicle tracking circuit.AVL is a combination of GPS (Global Positioning System) and GIS (Geographic Information SYstem). All data transmission in this project depends on GPS satellite and receiver on the board and Zigbee.

There are planty of tutorials availbel in Internet on how to connect Zigbee with your GPS module. Once you integrate Zigbee and GPS connect your circuit with Microcontroller. You can refer this article on how to connect GPS with 8051 microcontroller.


For building this Vehicle tracking system you will need Embedded C knowledge, RIDE to write code and ISP to burn the chip.


  • 8051 microcontroller kit
  • power supply
  • Zigbee module
  • GPS module

I hope you liked this project. Feel free to ask any questions in comment section below. Please like our facebook page and subscribe to our newsletter for future updates.

Final Year Engineering Projects for Instrumentation Engineering

Hi friends, in this article we will see some innovative project ideas. You can make use of these projects to build your engineering projects. These projects are specially for Instrumentation, electrical and electronics students.

In this post we will just discuss what type of innovative projects you can make for your final year projects. In upcoming posts we will see how we can build all these projects step by step.

Instrumentation Engineering Final Year Projects

Front Panel of Temperature Controller

1) RF Based Load Automation for smart home

Nowadays, modern houses and organisations are gradually shifting from conventional control system to centralised control system. This centralised control system make use of RF remote control to operate the equipment.

We can build this centralised control system by use of RF Transmitter, Receiver, micro controller, Encoder, Decoder, Switches and relays. This project costs near around 3000Rs – 4000Rs.

2)   Home Automation using TV Remote

This project looks very interesting and impressive as it involves home automation using our TV remote control. Infrared signals transmitted by remote control will get captured by sensor interfaced to control system. All the loads which you want to automate are connected to control system through relays.

Future scope of this project: You can enhance this project based on radio signal instead of Infrared signal of remote control. This will increase operating range so that you can operate equipment which are far away.

3) Recognition of Vehicle Number Plate using MATLAB

This is also one interesting project for Instrumentation Engineering students. In this project we are using just MATLAB so this project is also cost effective.

Here we capture the image of Vehicle number plate and by use of Image processing in MATLAb we can extract the data from that image. MATLAB will recognise the numbers from number plate and will show it as output.

4) Temperature control system using LabVIEW and Arduino

In this project we make use of LabVIEW and Arduino. To measure the temperature we can use any temperature sensor like thermistor, RTD, etc. We connect these sensors to analog pins of Arduino which will be interfaced to LabVIEW.

We can set our desired logics in LabVIEW to operate the heating elements. These heating elements are connected to arduino through relayes.

See also: Temperature controller using LabVIEW and Arduino

In upcoming posts we will see some more interesting projects for instrumentation and electrical engineering students. I hope you liked these project ideas. Like our facebook page and subscribe to our newsletter for future updates.