Simple Neon Glow Bulb Tester
Neon glow bulb is a nostalgic decorate lamp everybody seems to love. A small version is used still mainly as neon indicator light, also called pilot light, in electric/electronic instruments and appliances as a neon […]
Poor man’s Door Video Security Camera
This article describes a basic idea that can be used to build your own simple video security systems such as a door video security camera. In these times you can buy astonishingly cheap Car Rear-View […]
DTDC Switch for Outdoor/Street Lamp
Recently many readers demanded a simple automatic dusk-to-dawn controller (DTDC) electric switch circuit for real world outdoor/street lighting applications. I looked all the day and finally designed and built this little circuit based on easily […]
Arduino Power-Down & Auto-Save
Perhaps you will try tomorrow one microcontroller experiment that can store variable data in its EEPROM (electrically erasable programmable read only memory). Presented here is an idea to use inbuilt EEPROM of Arduino to save […]
DFR Turbidity Sensor Review & Thoughts
Turbidity sensors are widely used to measure the amount of suspended particles (turbidity) of the wash water in washing machines and dishwashers. In principle, turbidity sensor consists of an optical diode and optical transistor and […]
Jog LED Marker Light
If you’re looking for the circuit of a running / jogging light up wristband, here’s a tried and tested design without a microcontroller. Even though the design presented here is based on traditional (leaded) components, […]
Bluetooth Stereo Audio Adapter – DIY Intro & Review
Presented here is a shortcut to build your own bluetooth stereo audio adapter for listening ‘wire-free’ stereo music on the go! The one and only building block of this project is a Chinese bluetooth audio […]
Rechargeable Power LED Torch
A few readers demanded to see one simple circuit of a rechargeable power white LED torch that can be charged through a regular electrical outlet. Alright, here’s the circuit diagram of a simple yet useful […]
Solar Sensor Wall Light Review & Teardown
I stumbled across this Chinese solar wall light last week in Amazon while searching for automatic LED street lights. Admittedly it’s not a good fit as a powerful street light but reasonably good for pathway […]
Bicycle Tail & Stand light
If you are an active cyclist you must become more aware of safety and in particular your visibility to other riders, especially in winter and monsoon seasons. One drawback of your (pleasantly cheap) dynamo lighting […]