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Top Articles
Water Level indicator circuit diagram
Simple contactless water level indicator project
April 15, 2020
Repair TP-Link TL-WR740N Router WAN port
April 10, 2020
Reduce Refrigerator bills with this Simple circuit
April 7, 2020
Simplest shortwave transmitter circuit ever
January 31, 2017
measure low resiatance
How to accurately measure low resistance with cheap Multimeter
January 29, 2017
LM317 constant current circuit featured
LM317 constant current source circuit design
January 26, 2017
Directly Drive LED array from 230V AC
January 24, 2017
What is dielectric resonator oscillator and it’s application
January 23, 2017
HH004F LED driver
HH004F LED driver circuit
January 21, 2017
Best Free PCB Design Software
Free PCB design software – Ultimate list of 2018
January 20, 2017
C9018 miniature FM transmitter circuit
FM transmitter circuit using C9018 transistor
January 13, 2017
Stable miniature FM transmitter circuit
January 5, 2017
220v mobile charger circuit
Mobile charger circuit diagram, 100-220V AC
December 29, 2016
TDA2003 amplifier circuit build
TDA2003 amplifier circuit diagram 10 watt
December 24, 2016
ta2003p
TA2003P datasheet, pinout, features and circuit details
December 22, 2016
Reference Design – High power adjustable LED driver with MAX16835
December 21, 2016
MOSFET based delay timer ciruit
December 19, 2016
220V LED circuit – AC mains powered LED driver
December 15, 2016
20 watt push-pull CFL inverter circuit
December 14, 2016
Piezo buzzer Circuit build with BT66T
Simple Piezo buzzer circuit with UM66T IC
December 13, 2016
Simple dekstop audio amplifier by A6283 I.C
December 12, 2016
Simplest SMPS power supply ever – efficient and powerful – from an old CFL
December 11, 2016
DIY 3.3V USB breakout board, LVTTL and LVCMOS compatible
December 9, 2016
Simple magnetic buzzer circuit with UM66 IC
December 1, 2016
Simple Piezo Buzzer circuit diagram and project details
November 30, 2016
1 watt LED driver circuit 1.5V input, Modified Joule thief
November 25, 2016
Make your own DuPont jumper wires easily
November 23, 2016
6 or 3 watt LED driver circuit
1W to 5W led driver circuit with 12V input
November 19, 2016
DIY PoE injector for 10/100M Ethernet
November 10, 2016
Zero drop dusk to dawn solar charge controller by Sandeep
October 4, 2013
Inside a $10 phone
July 4, 2013
Happy New year & Intro:BuyCircuitsOnline
January 1, 2013
USB li-ion charger built by Jamie
November 29, 2012
Failed Prototype: VAmeter v3
November 14, 2012
Usb li-ion charger build
November 12, 2012
Low voltage cutoff circuit for Inverters
October 7, 2012
USB li-ion charger revision
October 6, 2012
Bench PSU made by ARTESYN NLP40-7629J SMPS
April 25, 2012
H Bridge inverter power stage with passives
April 11, 2012
OSSDAS v1
April 11, 2012
LM317 regulator board PCB making
April 6, 2012
How to repair mobile charger circuits
April 3, 2012
Step by Step: Make an Inverter’s power stage (MOSFET)
March 22, 2012
square wave to sine wave
Convert square wave Inverters to sine wave Inverter
March 14, 2012
DIY LED driver for 5Watt LEDs, 12V strips from 100-240 VAC
March 8, 2012
Subwoofer Lowpass Filter circuit using uA741 Single Op-Amp Ic
February 27, 2012
OSSDAS rev. beta
February 27, 2012
Simplest Solderless Breadboard Power Supply
February 25, 2012
Open Source Solar Data Acquisition System: First draft
February 16, 2012
Simple DIY Solar Panel (Homemade)
February 13, 2012
USB AVR Programmer final based on UsbtinyISP
February 7, 2012
PCB making process update: Easy PCB at home
January 19, 2012
Making SMD PCBs at home: Quick PSoC3 board built
January 9, 2012
Homemade DC Soldering iron driver
December 27, 2011
NAND, OR and XOR device detection through gate test
December 23, 2011
atmega8 VA meter final
Atmega8 based Voltmeter Ampmeter v2
December 20, 2011
Yet another regulated power supply board
November 26, 2011
PCB update
PCB update: Atmega8 Volt-Ammeter and USB AVR programmer
October 28, 2011
Atmega8 based Voltmeter Ammeter for solar application
October 14, 2011
Simplest USB AVR programmer
October 12, 2011
Introduction to Microcontrollers
October 12, 2011
Automatic quick turn on LED in dark
October 7, 2011
Simple LM358 OP-AMP based USB Li-ion charger
September 26, 2011
Inverter circuit project – up to 500 Watt
September 23, 2011
Simple Water level indicator circuit using Logic IC
September 17, 2011
USB MP4 video player kit review
September 16, 2011
Super 3 stage resistor and continuity checker
September 10, 2011
Simple Preamplifier for microphones, tape heads, etc
August 28, 2011
Mosfet based PWM sinewave Inverter board PCB Layout
August 13, 2011
Simple 3 Band Graphic Equalizer with BC548
July 3, 2011
Make power saver circuit to cut down electricity bills
July 2, 2011
Automatic Inverter and Mains Supply Changeover Circuit
June 29, 2011
Reuse Old Mobile Phone Battery for LED lighting
June 20, 2011
Simplest Modified SineWave Inverter without Microcontroller
June 17, 2011
2$ DIY Low cost USB Oscilloscope
June 10, 2011
100VA to 220VA MOSFET based Inverter kit circuit
June 7, 2011
Professional PCB making at home
May 30, 2011
Cheapest Mobile signal booster external antenna
May 28, 2011
Cheapest High power LED driver circuit diagram
May 16, 2011
Miniature electric fence circuit used in Mosquito Racket
May 14, 2011
5v to 12v converter – Simple DC voltage booster circuit
May 8, 2011
Setup diagram of an Alfa branded 12 Volt 20 Watt CFL kit
May 5, 2011
High Performance LA4446 Stereo Audio Amplifier Circuit
April 30, 2011
Miniature USB powered amplifier circuit for Laptops
April 25, 2011
Use old 6V sunca charger battery for LED lighting
April 20, 2011
Easy Loudspeaker circuit for telephone
April 17, 2011
Capture RF energy from environment by using a stick antenna
April 14, 2011
The Simplest TV transmitter ever made
April 10, 2011
Simple 10 Rupees microphone for PC, Skype, VoIP
April 7, 2011
TDA2030A Amplifier Circuit used in home theaters
March 26, 2011
Router UPS setup, battery in your ADSL modem or router
March 18, 2011
Winner of the 4GB pendrive giveaway contest.
March 15, 2011
An easy to make voltage coupler(2X) circuit, for mini projects
March 7, 2011
Solar to 6V Batt to LED emergency light circuit
February 27, 2011
How to save solder wire
February 25, 2011
3 volt easy DIY FM receiver by TA2003 I.C
February 14, 2011
Emergency Tube light & Blinker Bulb with Fan
February 11, 2011
Bass treble control without any IC, Transistor
February 10, 2011
6 Volt 9 Watt Emergency light circuit
February 9, 2011
Inverter Oscillator Board using Flip Flops 74LS112
January 31, 2011
Water Level indicator circuit diagram
Posted inBasic Electronics

Simple contactless water level indicator project

Water level indicator is a very easy electronics project. Water tank overflow as well as tank exhausting without any previous clue is a common household issue which we have to…
Continue Reading
Posted by Arup April 15, 2020
Posted inOthers

Repair TP-Link TL-WR740N Router WAN port

This article describes how I repaired my router which had burnt WAN port at no cost.
Continue Reading
Posted by Arup April 10, 2020
Posted inOthers

Reduce Refrigerator bills with this Simple circuit

Refrigerator is a common household electrical appliance. When we buy refrigerator we try to minimize the electrical power consumption by looking for BEE 4 or 5 star rated ones which…
Continue Reading
Posted by Arup April 7, 2020
Posted inFM/AM Oscillator Transmitter

Simplest shortwave transmitter circuit ever

So, if you're looking for the the simplest and cheapest shortwave transmitter circuit, it's here. This transmitter is very low power and very stable as well, uses a readily available…
Continue Reading
Posted by Arnab January 31, 2017
measure low resiatance
Posted inBasic Electronics

How to accurately measure low resistance with cheap Multimeter

We often need some low value resistors, less than 1 Ohm. Mostly as current sensing resistors in power electronics projects. You can't measure less then 1 Ohm with cheap multimeters.…
Continue Reading
Posted by Arnab January 29, 2017
LM317 constant current circuit featured
Posted inBasic Electronics

LM317 constant current source circuit design

A constant current source source can supply a fixed current to a load regardless of input voltage or load change. LM317 constant current source is one of the simplest design.…
Continue Reading
Posted by Arnab January 26, 2017
5v to 12v converter – Simple DC voltage booster circuit
Posted inOthers

5v to 12v converter – Simple DC voltage booster circuit

You can use this 5V to 12V converter circuit to easily get 12 volts from a 5V similar source. This is based of the theory that inductor holds current and…
Posted by Arup May 8, 2011
Setup diagram of an Alfa branded 12 Volt 20 Watt CFL kit
Posted inCFL/Tube Inverter

Setup diagram of an Alfa branded 12 Volt 20 Watt CFL kit

This CFL lighting kit is available from a reputed brand alfa, which is known for it’s circuits in applications of inverter like products. We get a good stable circuit from…
Posted by Arup May 5, 2011
High Performance LA4446 Stereo Audio Amplifier Circuit
Posted inAmplifier

High Performance LA4446 Stereo Audio Amplifier Circuit

LA4446 is of similar series IC as LA4440, but it is meant for dual or stereo 5.5Watt RMS outputs. While 4440 gives 6Watt outputs at dual mode, this gives almost…
Posted by Arup April 30, 2011
Miniature USB powered amplifier circuit for Laptops
Posted inAmplifier Gadgets USB

Miniature USB powered amplifier circuit for Laptops

There’s been a strategy in market of buying USB powered speakers for laptops. These speakers usually drives power from one available USB port and inputs audio signal from headphone port,…
Posted by Arup April 25, 2011
Use old 6V sunca charger battery for LED lighting
Posted inInverter

Use old 6V sunca charger battery for LED lighting

Many of us have 6Volts emergency light units in our house. The batteries there are of 6Volts 4 to 4.5AH. These batteries are SLAMF battery (Sealed Lead Acid Maintenance Free),…
Posted by Arup April 20, 2011
Easy Loudspeaker circuit for telephone
Posted inAmplifier Gadgets

Easy Loudspeaker circuit for telephone

This below circuit is a easy handsfree telephone receiver system. This doesn’t have dialing circuit so, it’s not a total phone replacement circuit, but it’s just only a loudspeaker system…
Posted by Arup April 17, 2011
Capture RF energy from environment by using a stick antenna
Posted inTransmitter

Capture RF energy from environment by using a stick antenna

There are a lot of RF energy(unused) in our environment, by TV , radio channels, etc. We can capture energy of any wave by tuning same frequency resonating coil, but…
Posted by Arup April 14, 2011
The Simplest TV transmitter ever made
Posted inTransmitter

The Simplest TV transmitter ever made

We have earlier discussed how to make the simplest FM transmitter, now it’s time to make a TV transmitter. We can broadcast our DVD playbacks, etc to our neighborhood area…
Posted by Arup April 10, 2011
Simple 10 Rupees microphone for PC, Skype, VoIP
Posted inGadgets

Simple 10 Rupees microphone for PC, Skype, VoIP

With addition to a webcam in a PC, it is required to have a mic also. If we have headset cum mic, then no problem, but if we don’t? Well,…
Posted by Arup April 7, 2011
TDA2030A Amplifier Circuit used in home theaters
Posted inAmplifier

TDA2030A Amplifier Circuit used in home theaters

TDA2030A or TDA2030 is a well used class AB audio amplifier IC. TDA2030A amplifier circuit is mostly used in nowadays home theatre systems for it’s some good features. Small size IC(package…
Posted by Arup March 26, 2011

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