Low Resistance Continuity Tester
Continuity testing is the act of testing the resistance between two points. If there is very low resistance (less than a few Ωs), the...
Sensitive Optical Burglar Alarm
Burglar alarms have become standard equipment in stores and other businesses, and they're becoming increasingly common in private homes as well. If you've ever...
Clap Operated Electronic Switch
Here’s a simple clap operated electronic switch. Using this switch, you can turn on any appliance by clapping five times and turn it off...
Touch Dimmer
By simply touching this touch dimmer you can increase the light intensity of incandescent lamps in three steps. The touch dimmer is built around...
Fuse cum Power Failure Indicator
Fuse blowing is a common problem, but is so tedious to go and check because every time it may not be blown. Here is...
Flashing Beacon
A flashing beacon has many uses. It can be employed as a distress signal on highways or as a direction pointer for parking lots,...
Automatic Headlight Switcher
Automatic headlamps are the latest convenience in today's cars. These eliminate the need for the driver to manually switch on or switch off the...
Automatic Parking Light For Cars
At night, parking lights make your parked car visible to motorists so they don’t smash into your car. However, these lights drain considerable power...
Anti-Theft Alarm
You can use this anti theft alarm circuit to thwart burglary. It sounds an alarm when someone tries to intrude into your home or...
Simple Intercom Circuit
This simple intercom circuit functions quite satisfactorily. The circuit does not involve any complicated switching. The switches S1/S2 must be fixed in such a...
Earth Fault Indicator
In mains powered equipment, exposed metal parts are connected to earth wire in order to prevent users from contact with high voltages if electrical...
Automatic Night Lamp With Morning Alarm
This automatic night lamp circuit turns on a night lamp when bedroom light is switched off. The lamp remains ‘on’ until the light sensor...
Automatic Washbasin Tap Controller
Make your washbasin tap work automatically when you put your hands just below the water tap outlet. This infrared-based automatic washbasin tap controller system...
Contactless AC Mains Voltage Detector
This is a CMOS IC (CD4033) based contactless AC mains voltage detector circuit which can be used to detect presence of AC mains voltage...
LED Based Message Display
This LED based message display is built around readily available, low cost components. It is easy to fabricate and makes use of 3mm red...
Blown Fuse Indicator
A fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire...
Panic Alarm
If you feel threatened or need emergency assistance, simply activate this panic alarm. It will catch the attention of others for immediate help. The...
Shock-Proof Remote Switch
Using this shock proof remote switch circuit, you can control any AC/DC appliance remotely through inexpensive, low-voltage cabling and a standard push switch. The...