Circuits DIY – Page 4 of 12 – Electronics & Embedded System news, tips and tutotials

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 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: 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

Basic 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…

Arup April 15, 2020

Others

Repair TP-Link TL-WR740N Router WAN port

This article describes how I repaired my router which had burnt WAN port at no cost.

Arup April 10, 2020

Others

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…

Arup April 7, 2020

FM/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…

Arnab January 31, 2017

measure low resiatance

Basic 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.…

Arnab January 29, 2017

LM317 constant current circuit featured

Basic 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.…

Arnab January 26, 2017

Inside a $10 phone

Inside a $10 phone

Last week I bought a cheap china phone as my primary phone went to service center for 3 days. It's this: http://icellmobiles.com/product_detail.php?&getID=133 I got the phone for Rs.500 (~US$8.4) including…

Arup July 4, 2013

Happy New year & Intro:BuyCircuitsOnline

Happy New year & Intro:BuyCircuitsOnline

We wish all our readers a happy and prosperous new year. We wish to do more experiments/engineering this year. In this new year occasion, a new website is launched from…

Arup January 1, 2013

USB li-ion charger built by Jamie

USB li-ion charger built by Jamie

Jamie Navarro built a USB li-ion charger on breadboard. Now he is working to get it fine tuned to accurate voltage levels. He scored a free PCB for this. Wish…

Arup November 29, 2012

Failed Prototype: VAmeter v3

AVR

Failed Prototype: VAmeter v3

Just a few days ago the PCBs for VAmeter v3 came in. VAmeter is a simple board that connects to your existing power supply and shows the volatge, current, etc.…

Arup November 14, 2012

Usb li-ion charger build

USB

Usb li-ion charger build

This is the completed PCB of the USB li-ion charger circuit.

Arup November 12, 2012

Low voltage cutoff circuit for Inverters

Low voltage cutoff circuit for Inverters

Running inverters on battery drains the battery. This decreases the battery voltage. To regulate output voltage and to make it independent(upto a certain level) we use PWM based drivers like…

Arup October 7, 2012

USB li-ion charger revision

USB li-ion charger revision

An year ago, I've shared a circuit of USB li-ion charger based on LM358opamp. The circuit had some problems as reported by commentators that inclide wrong direction of LEDs. Features:…

Arup October 6, 2012

Bench PSU made by ARTESYN NLP40-7629J SMPS

Bench PSU made by ARTESYN NLP40-7629J SMPS

Few months ago I ordered ARTESYN – NLP40-7629J – SWITCH MODE POWER SUPPLY from element14. Including shipping and taxes, it took nearly Rs. 3500 (~USD $70) to reach me. Have a look at the SMPS in the pictures below.

Arup April 25, 2012

H Bridge inverter power stage with passives

H Bridge inverter power stage with passives

The above circuit I got from replies from edaboard. I had created a thread there on how can I drive a 2 pin primary transformer with H bridge configuration…

Arup April 11, 2012

OSSDAS v1

OSSDAS v1

The PCBs for OSSDAS came yesterday by post from SeeedStudio. This is the completed board. Looks like old firmware was still in the microcontroller. The board just booted up after…

Arup April 11, 2012

Water Level indicator circuit diagram

Basic Electronics

Simple contactless water level indicator project

Arup April 15, 2020

Others

Repair TP-Link TL-WR740N Router WAN port

Arup April 10, 2020

Others

Reduce Refrigerator bills with this Simple circuit

Arup April 7, 2020

FM/AM Oscillator Transmitter

Simplest shortwave transmitter circuit ever

Arnab January 31, 2017