Electronic Circuits

Free Electronic Circuits, Schematics and circuit diagrams. This section of EG Labs brings you new & latest electronics circuits and schematics. These hobby circuit ideas are described with the circuit diagram, description and components used in the circuit.
Latest Electronic Circuits

Using remote control for home appliances is a great choice. They can be used to on and off the appliances like TV, AC, DVD player, motor etc with the help of our TV remote. LEDs can be used to on and off. IF LED1 is glowing, it means device is off and if LED2 glows than the device connected is on. This is a low cost circuit is based on the CD4017 counter IC which receives trigger pulse from IR sensor and switch on the relay. Since, the device is connected to relay it is also switched on.

Upon receiving the second pulse motor become off. You can control your toy car from 5 meters range. This is a simple circuit based on infrared sensor IC TSOP1738. TSOP1738 contains photo detector and pre-amplifier both in one package. It is a three terminal device. Pin 1 is for ground, Pin 2 is for power supply and pin 3 is used as output.

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The number guessing game is quite simple. In this game the player thinks any number between 1 to 99 and then if same number is displayed on screen, he wins otherwise player looses the game. This simple circuit is based on two IC's namely NE555 which is a timer IC. In this circuit we are utilizing it astable mode.
And another one that we are using is 4026, which is a decade counter/divider IC. It converts the input into numeric display without any decoder IC which can be seen on 7 segment display. In this circuit NE555 astable generates a clock for the circuit, which provides a oscillating wave to the output pin 3 of IC1. The time period of counter can be calculated by following formula T = 0.7 (R1 + 2*R2)*C1.

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CD4026 is a Johnson counter IC commonly used in digital display. It has a 5 stage Johnson decade counter with a decoder which converts the Johnson code to a 7 segment decoded output. To put it simply, it will convert the input into numeric display and can be seen on 7 segment display or with LED. It can be used for displaying analogue value such as temperature with pic microcontroller or for counting objects.

There is various other applications like in 7 segment decimal display circuit, in clocks, timer etc. Advantages of 4026 counter are : It contains counters and 7 segment decoded in one package, It can be easily interfaced with 7 segment types, Ideal for low power display, Operated at wide range of temperature from 5V to 20V and the biggest advantage of the 4026B counter IC is that it can drive a 7-segment display without needing a decoder driver IC.

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More Electronic Circuits

2

2 in 1 Door Bell
2-1 Quiz Buzzer

4

4 Player Quiz Buzzer

5

555 Timer As Amplifier
555 Timer IC Tester

9

9-Way Clap Switch Circuit Diagram
90 Second Timer

A

Active high trigger for 555 in monostable mode
Audio Amplifier using Opam
Automatic night lamp
Astable mode by NAND gate
Automatic light/dark indicator
Automatic Power OFF timer for CD player
Audio amplifier

B

Bathroom Light Off Timer
BCD to 7 Segment display Circuit
Bi Color LED

C

CD 4013 based Sound Sensing Module
CD 4060IC based Message Display Circuit
Color distinguished using LDR/Color sensor using LDR
CD 4013 Based Two Way Switch
CD4001 IC based Lighting System
Conversion of NAND gate to Basic gates
CD 4027 Based Emergency Lighting System
CD4049 Based LED torch
Conversion of NOR gate to Basic gates
CD 4060 Based Security Alarm
Coin Toss/Flip Simulator Circuit

D

Dancing LED's
Darkness Detector Alarm
Display System used in Restaurant
Darkness detector
Differential amplifier
DTMF Decoder

E

Electronic alarm for cash box, lockers
Electronic Dice Circuit
Electronic Timer Circuit
Electronic Code Lock Circuit
Electronic Letter Box

F

Fading LEDs
Fixed voltage power supply
Full range centigrade temperature sensor
Fire alarm
Flip Flop based Staircase Switch

G

Generating time delay with 555 IC

H

H-bridge using transistor
High Pass Filter Circuit

I

IC 555 Based Message Display Circuit
Interfacing 4026 with 7 segment display
Inverting amplifier using 741
IC555 based Multicolor LED Lamp Circuit Diagram
Intruder alarm / Burglar alarm based Home Security System
Inverting amplifier with signal feedback
Infrared (IR) sensor
Inverting amplifier

L

LED Based Pendulum Circuit
Light detector
Long range IR
Led Flasher Circuit
Light sensor using photodiode
Low pass filter
LED Lamp Using CA3140 IC
Liquid level Alarm
Luggage Security Alarm
Light dependent frequency variation using LDR

M

Magic Eye Circuit Using 4049 IC
Multi-Utility Flashing Light
Music (Data) transfer by IR
Metronome
Multipurpose Timer With Musical Alarm
Music (Data) transfer by IR by amplification
Multi Color Lighting

N

NAND Gate as SR Flip Flop
Night Lamp using 555
NOR Gate as SR Flip Flop
NAND gate monostable
Night Lamp with Timer for Stairs
NOT gate monostable
NE 555 Timer based Automatic Headlight
Non inverting amplifier
Number Guessing Game
Negative supply using 555 IC

O

Opamp as comparator
Overheat/Overcooling circuit breaker

P

Periodically Turning On & Off Mosquito Repellent Circuit Diagram
Piezo sensor as output
Power failure alarm
Piezo sensor as input
Polarity cum Continuity Tester
Pre Set Off Timer

R

Random Number Generator Using 7 Segment Display
Relay control through mic
Remote Tester Circuit
Refrigerator Door Alarm
Relay operation using Darlington Pair
RF based Fire Alarm (Overheat Alarm)
Relay activation using TSOP 1738
Remote Control For Home Appliances
RF based Intruder Alarm
Relay control by sound
Remote Controlled Toy Car
RF based Wireless Remote Control

S

Secure room access system
Simple AC to DC converter using bridge rectifier
Sound Operated LED
Security Alarm for Doors, Almirah, cupboards using Opam
Single switch motor on/off.. Clockwise/anticlockwise
Sound Operated Switch
Seismic sensor
Sound generation in audio range
Suitcase Security Alarm
Shadow Alarm using LDR
Sound Generation using 555

T

Timer Circuit using IC CD 4060
Touch switch
Transistor as audio amplifier
Toggle flip flop using CD4013
Touch Switch Circuit using 555 Timer
Transistor Based Secret Bell
Toggle switch using CD4017
Traffic light signal
Transistor Tester Circuit Diagram
Tone generator

U

UM3561 IC Based Security Alarm
Understanding JK flip flop using CD4027
USB Mobile Charger Circuit Diagram
Understanding Decade Counter CD4017
Understanding NOR Gate (CD4001)

V

Variable power supply
Vehicle Indicator
Voltage Doubler Circuit Using IC 4049
Variable power supply and charger with emergency light
Vehicle Indicator Circuit
Voltage Doubler Circuit Using IC555
Variable Power Supply From Fixed Voltage Regulator
Voltage boost by using a resistor with 78XX

W

Water level controller cum indicator circuit diagram
Water Tank Overflow Alarm
Wireless Switch Circuit Diagram
Water level indicator with display
Wireless motor control through RF
Working of light dependent resistor
Water Sensor Circuit
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