Inexpensive car Protection Unit

For car protection, custom-made units are available but they are costly.Here’s a circuit to protect car stereo, etc from pilferage that costs less and requires no adjustments in the car but...

White LED-Based Emergency Lamp and Turning Indicator

White LEDs are replacing the conventional incandescent and fluorescent bulbs due to their high power efficiency and low operating voltage. These can be utilised optimally for emergency lamp and vehicle turning...

FUEL RESERVE INDICATOR FOR VEHICLES

Here is a simple circuit for monitoring the fuel level in vehicles. It gives an audiovisual indication when the fuel level drops alarmingly below the reserve level, helping you to avoid...

16-Way Clap-Operated Switch

Control your home appliances without getting out of your bed. You just have to clap in the vicinity of the microphone used in this circuit, which you can keep by the...

Battery Charger with Automatic Switch-off

This smart charger automatically switches off when your rechargeable batteries reach the full charge. The circuit comprises a bistable multivibrator wired around timer IC 555. The bistable output is fed to an...

BRAKE FAILURE INDICATOR

Do you want to get an early warning of brake failure while driving? Here is a brake failure indicator circuit that constantly monitors the condition of the brake and gives an...

Multidoor Opening Alarm with Indicator

This door-opening alarm alerts you of intruders. You can use it for up to three doors. You simply need to fit a small unit including reed switch on each doorframe and fix...

Rechargeable Torch Based on White LED

Rechargeable torches don’t come without problems. You need to replace the bulbs and charge the batteries frequently. The average incandescent light-emitting diode (LED) based torch, for instance, consumes around 2 watts....

SAFETY GUARD

Protect your home appliances from voltage spikes with this simple time delay circuit.At the heart of the circuit is IC CD4060, which consists of two inverter gates for clock generation and...

Mock Alarm with Call Bell

Here is a fully automatic mock alarm to ward off any intruder to your house. The alarm becomes active at sunset and remains ‘on’ till morning. The flashing light-emitting diodes (LEDs)...