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)...

Sound-Operated Switch for Lamps

This inexpensive, fully transistorised switch is very sensitive to sound signals and turns on a lamp when you clap within 1.5 metres of the switch. One of its interesting applications is...

TV Pattern Generator

This single-IC TV pattern generator is useful for fault finding in TV sets. You can correct the alignment of the timing circuits of the TV set with the help of this...

Simple Low-Power Inverter

Here is a simple low-power inverter that converts 12V DC into 230-250V AC. It can be used to power very light loads like window chargers and night lamps, or simply give...

SOLAR BUG

Hide this solar-powered circuit suitably and see the reaction of your friends to the chirpy sound produced by it every few minutes. In all probability, it will coax them to find...

Accurate Foot-Switch

Certain industrial controls require accurate switching operations. For example, in case of a foot-switch for precise drilling work, even a small error in switching may cause considerable loss. This low-cost but...