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Title: Latest Electronics Projects to Build PDF Ebook
Author: http://www.circuitdiagram.org

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LATEST ELECTRONICS PROJECTS TO BUILD
FREE EBOOK BY WWW.CIRCUITDIAGRAM.ORG

Contents
BY WWW.CIRCUITDIAGRAM.ORG



Door Left Open Indicator Alarm



Digital Variable Resistor



Cold Sensor Switch Using LM35 & CA3140



Simple Loud Security Alarm Using PIR Sensor Module



LED Thermometer with Selectable Temperature Switch



Home & Office Basement Flood Alarm



Motion Sensing Main Gate Night Light



Contact Less Mains Power Failure Alarm



Motion Sensor Solar Outdoor Light



Automatic Washroom Light



Simple Automatic Emergency Light



Single Chip Light Dark Sensor Switch



Automatic Sequence Solar Battery Charger



Touch Activated Switch Using 4011 IC



Multiple Style Flasher Using 555

For More Latest Electronics Projects Visit:

www.circuitdiagram.org

PAGE 01

LATEST ELECTRONICS PROJECTS TO BUILD
FREE EBOOK BY WWW.CIRCUITDIAGRAM.ORG

PAGE 02

About This Book
BY WWW.CIRCUITDIAGRAM.ORG

This free eBook is a joint effort of circuitdiagram.org team for electronics students, electronics
engineers and electronics hobbyists to provide latest & working electronics projects that uses low
cost, reliable and easy to get components.

This book contains some of the very useful electronic projects, which can be built in one or two
hours if all components are available with you. You can also make changes in these projects to
make them according to your requirements or use them with your big electronics projects. These
projects can also be connected with microcontrollers for further enhancements.

This free book is produced by Circuitdiagram.org, www.circuitdiagram.org is an educational
website which provides free electronics projects, there are hundreds of latest designed electronics
projects are on the website and new circuits / projects are added frequently. You will find many
categories of electronics projects / circuits on the website which are audio circuits, power supply
circuits, battery charger circuits, test & measurement circuits etc.

For more latest electronics projects please visit www.circuitdiagram.org and do not forget to visit
the website often to get the latest added electronics projects.

Published on April, 2017

For More Latest Electronics Projects Visit:
WWW.CIRCUITDIAGRAM.ORG

LATEST ELECTRONICS PROJECTS TO BUILD
FREE EBOOK BY WWW.CIRCUITDIAGRAM.ORG

PAGE 03

Door Left Open Indicator Alarm
BY WWW.CIRCUITDIAGRAM.ORG

Electronics technology is helping us in every part of life and as this technology is growing day by
day it is making our life easier & better. It is solving many issues & problems of our life and in
these issues one of the main issue is security. The uses of electronic security devices
increasing because every one wants to be secure and wants security of their homes, cars, offices
etc.

The simple circuit diagram shown here will also serve for a very useful security
related purpose. It will alert you by a melodious alarm when you forget to close the door after a
preset time period.
The circuit can be used for any of your door for example your home door, office door, garage door,
store room door or even your lockers and cupboard doors.

For More Latest Electronics Projects Visit:
WWW.CIRCUITDIAGRAM.ORG

LATEST ELECTRONICS PROJECTS TO BUILD
FREE EBOOK BY WWW.CIRCUITDIAGRAM.ORG

PAGE 04

Digital Variable Resistor
BY WWW.CIRCUITDIAGRAM.ORG

This is a circuit diagram of digital variable resistor, the circuit can be used to replace analog
variable resistor in any desired electronic circuit, therefore it can be used to adjust the value of
resistance by pushing a button or digitally adjust connecting it to microcontroller, this procedure
replaces the need of manually hand adjustments by the user.

The circuit is very easy to build and using low cost ICs and components. The operating voltage of
the circuit can be any from 5V to 16V DC. It can also be operated with 3V, and if you want to
operate with 3V just replace the NE555 IC with its low voltage CMOS version 7555 or LMC555
etc.

For More Latest Electronics Projects Visit:

WWW.CIRCUITDIAGRAM.ORG

LATEST ELECTRONICS PROJECTS TO BUILD
FREE EBOOK BY WWW.CIRCUITDIAGRAM.ORG

PAGE 05

Cold Sensor Switch Using LM35 &
CA3140
BY WWW.CIRCUITDIAGRAM.ORG

Like heat sensor a cold sensor circuit can also be made using almost same components which is
used by heat sensor. The circuit diagram of cold sensor switch using LM35 & CA3140 shown here
can be used to control AC and DC devices on desired cold temperature.

The LM35 temperature sensor IC is used to detect the temperature. The CA3140 is an operational
amplifier & it is working in comparator mode here. The circuit can be operated with any voltage
from 5V to 12V DC. Make sure to use the relay value according to the operating voltage.

For More Latest Electronics Projects Visit:
WWW.CIRCUITDIAGRAM.ORG

LATEST ELECTRONICS PROJECTS TO BUILD
FREE EBOOK BY WWW.CIRCUITDIAGRAM.ORG

PAGE 06

Simple Loud Security Alarm Using
PIR Sensor Module
BY WWW.CIRCUITDIAGRAM.ORG

This is a circuit diagram of simple loud security alarm. This circuit can be used in any room or
outside area. The circuit will make a loud alarm when the PIR sensor module used in the circuit
will detect the presence of any person or animal in its detection range.

The circuit uses a ready made PIR sensor module that can be easily purchased from your local
electronic store or from any reputable online electronic store. This ready made PIR sensor Module
also contains a variable resistor to set the time period of output after sensing an infrared. The
operating voltage of the circuit is 5V to 12V DC.

For More Latest Electronics Projects Visit:
WWW.CIRCUITDIAGRAM.ORG

LATEST ELECTRONICS PROJECTS TO BUILD
FREE EBOOK BY WWW.CIRCUITDIAGRAM.ORG

PAGE 07

LED Thermometer With Selectable
Temperature Switch
BY WWW.CIRCUITDIAGRAM.ORG

Here is a very useful project of a LED thermometer with selectable temperature switch. The
circuit contains two different functions which are temperature sensing with visual indication
through LEDs and another function is it can also control any AC/DC device or appliance on the
desired selected temperature.

A 10K NTC thermistor is used as a sensor for temperature. 10 LEDs are connected at the output of
LM3914 IC. LM3914 IC contains 10 separate opamps and each LED is derived by a separate
opamp. The point marked IC connection in the circuit diagram can be connected with any desired
pin of the IC from which any LED is connected so it will switch on the relay switch on the desired
temperature.

For More Latest Electronics Projects Visit:
WWW.CIRCUITDIAGRAM.ORG

LATEST ELECTRONICS PROJECTS TO BUILD
FREE EBOOK BY WWW.CIRCUITDIAGRAM.ORG

PAGE 08

Home & Office Basement Flood
Alarm
BY WWW.CIRCUITDIAGRAM.ORG

The figure below shows a very useful project of home & office basement flood alarm that will
indicate if water enters in your home or office basement. The circuit makes an early indication so
the user have much time to stop the water before it enters in the furniture or in electronic
appliances. The circuit is very easy and can be built with in one hour if you have all the
components at your table. A UM66 melody alarm circuit is connected at the output which will
become activated when the two sensors shown in the circuit will detect water.

The two sensor points shown in the circuit diagram should be attached where there are most
chances of water to come first or you can also attach it on multiple location by simply attaching
more wires with it.

For More Latest Electronics Projects Visit:
WWW.CIRCUITDIAGRAM.ORG


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