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292 articles written by T.K. Hareendran

Author: T.K. Hareendran

About: Internationally Certified Freelance Technical Author/Circuit Designer Electronics Engineering Technologist Founder & Promoter of TechNode» PROTOLABZ – An Open Source Hardware R&D Lab Tel: +91 (0) 9447712139 Email: designlab.technode@gmail.com

Website: http://technodeprotolabz.blogspot.in/

1-NS73M Module

Build Your Own Digital FM Radio Transmitter with Arduino

T.K. Hareendran - 04/10/2017

I recently searched for a digital FM transmitter kit, but most of the ones that I found online [...]
dpot 1

Learn To Use Digital Potentiometers

T.K. Hareendran - 04/09/2017

A resistor is an electrical device that resists the flow of electrical current. In the digital era, we [...]
nmcu-p6

The NodeMCU (IoT) Guide

T.K. Hareendran - 04/03/2017

The NodeMCU development board is a powerful solution to program microcontrollers and be part of the Internet of [...]
CMic 2 schematic

Simple Contact Microphone

T.K. Hareendran - 04/02/2017

Unlike other microphones, a contact microphone makes you look at the world in a different way. At the [...]
2 hardware_setup

Arduino Melody Shaper

T.K. Hareendran - 02/11/2017

This tutorial will show you how to use the Arduino to play your most-loved tunes. The steps are [...]
EMFD-2

Simple EMF Detector/Meter

T.K. Hareendran - 02/09/2017

I recently built a simple electromagnetic field (EMF) detector based on a code by Christian Figge that I [...]
1-System View

UV Sterilizer for Aquarium

T.K. Hareendran - 02/07/2017

Ultraviolet (UV) Sterilizers are used to control infections by stopping the spread of microorganisms from one fish to [...]
2. Circuit Diagram

Simple Delta Wave Generator

T.K. Hareendran - 02/06/2017

A delta wave, also known as delta rhythm, is the normal brainwave in the encephalogram of a person [...]

Inexpensive DIY Gauss Meter Project

T.K. Hareendran - 12/02/2016

Gauss meters are expensive devices and are typically not within reach of the average electronics hobbyist. Presented here [...]
Emulator Circuit

Mobile Phone Battery Emulator

T.K. Hareendran - 12/01/2016

Recently, a mobile phone service technician wanted me to build a battery emulator that would enable him to [...]