Connecting Arduino Board with Android Device
There must be a lot of people out there who love trying out things with Android, and who spend a lot of time experimenting...
Glass Break Alarm
This circuit can be used for sounding an alarm to detect the breaking of a glass window by an intruder, even when the intruder...
Multichannel Visual Thermometer
The temperature of some electronic components used in a device may rise unexpectedly and these might get damaged. This multichannel visual thermometer can indicate...
Simple Light and Sound Indicator for Mains Power Supply
While repairing or installing electrical machines in a building, the AC mains power supply is switched off from the mains electrical switchboard installed outside...
DIY: Turn your old Hard Drive into a Speaker
Use your old hard drive to turn into a Speaker with this Do It Yourself video.
Courtesy: afrotechmods
Wireless Baby Monitor
A baby monitor can help you find peace of mind. You can now monitor your sleeping baby with this wireless baby monitor. It is...
Bicycle USB Charger
This circuit has been developed to add a USB charging port to a bicycle for charging a mobile phone. The input supply for the...
Door-Knock or Vibration Alarm
This is a simple circuit that activates an alarm when there is a knock on the door or there are any vibrations due to...
Automatic Evening Lamp
Presented here is a solution for switching off outdoor lamps even when you are not at home. The lamp turns on in the evening...
Laser Based Security Lock
Presented here is a security system that uses an inexpensive laser torch which is usually available with a key ring. The advantage of this...
Desktop LED Emergency Light
You can make an ultra-simple desktop emergency light using ‘discharged’ batteries. You know that battery cells still have considerable energy left in them even...
Speed Controller for Small Cooling Fans
Small cooling fans are used in some equipment for cooling semiconductor devices. The circuit given here is of a simple automatic speed controller for...
Auto Snooze for Digital Alarm Clocks
Alarm clocks are made to wake you up. However, it is quite bothersome to hear the alarm continuously until you get up and put...
Mains Operated Remote Control Tester
This handy remote control tester responds to the signal received from any infrared hand-piece (IR remote control).
Circuit and working
Fig. 1 shows the circuit diagram...
Smoke Extractor
Here is a low-cost circuit that automatically extracts solder fumes while you assemble a circuit, thereby saving you from inhaling the same. The solder...
Multi-Tone Configurable Alarm
Presented here is a multi-tone configurable alarm that can be activated by temperature and other physical parameters. Its output tone can be selected through...
Solder Fumes Remover
During soldering, lead fumes are generated, which are toxic. The flux used for soldering also emits fumes, which again are highly toxic if inhaled...
Fan on/off Control by Light
This circuit lets you turn on/off a fan by just directing torchlight or other light toward its light-dependent resistor (LDR). The circuit is powered...