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Monitoring circuits in battery chargers, water-level indicators, etc use LEDs to indicate the status of certain conditions. Presented here is a multiple status indicator circuit that uses a single RGB LED for seven different indications. Circuit and working for Multiple...
Here is a simple 5-watt mono audio amplifier using IC TA7222 that drives a 4-ohm speaker using a 9V battery or a 9V DC adaptor. You can also make a stereo amplifier by using two identical circuits. Circuit and working...
Here we describe a very simple, economical and light-weight automatic nightlight that runs on 230V AC mains and can be used as a deluxe gizmo in the sleeping room of your kids. The arrangement proposed by the author is...
A "Clap On Clap Off" switch is an interesting concept that could be used in home automation. It works as a switch which makes devices On and Off by making a clap sound. Although its name is “Clap switch”,...
Motor driver modules for motors allow you to control the working speed and direction of two motors simultaneously. Here we present an alternative ULN2803 based motor driver circuit to drive two motors. The main advantage of this project is...
We face a lot of problems everyday to charge our mobile phone batteries. Here is a simple and effective way to charge your mobile phone batteries with a 9v Battery. You can check the status of the battery pressing...
In this small project, the presenter will give you a short tutorial on accelerometer ICs and find out how we can use them with an Arduino. Also, he will explain how one can combine such an IC with a couple...
Theremin is an early electronic musical instrument controlled without physical contact by the thereminist (performer). It is named after the Russian inventor, Léon Theremin, who patented the device in 1928. A typical theremin musical instrument is shown in Fig....
If you are an electronics hobbyist and need to measure low currents and low voltages, you can buy any inexpensive multimeter. However, test leads of such meters are fragile. That’s what led me to make my own multimeter test...
Most houses have backyard gardens or some open areas. Installing a garden light there provides visibility at night. But there can be problems in its installation since the wiring may hamper movement and disturb plants in the garden. Presented...