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Drinking Water Supply Alarm

The State Jal Boards supply water for limited duration in a day. Time of water supply is decided by the management and the public...

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’...

Heat Sensitive Switch

At the heart of this heat sensitive switch is IC LM35 (IC1), which is a linear temperature sensor and linear temperature-to-voltage converter circuit. The converter...

Optical Remote Switch

Using this optical remote control, you can switch on/off any electrical or electronic load. Like any remote control system, it has a mini transmitter unit and a receiver unit to activate the relay.

Infrared (IR) Illuminator

Infrared (IR) illuminators are widely used to improve the image-capturing quality of security cameras fitted in dark zones. Just like our eyes, cameras also...

Low-cost Intercom Circuit Using Transistors

This is a circuit for a low cost intercom that is made by using transistors.

Sound Operated Lamp Switch

This inexpensive, fully transistorised sound operated lamp switch is very sensitive to sound signals and turns on a lamp when you clap within 1.5...

Infrared Toggle Switch

This infrared toggle switch can be controlled by any TV/VCR remote operating at 38kHz frequency. The circuit uses readily available, low-cost components and can be assembled on a small veroboard.

Smart Vibration Sensor

Machines nowadays require optimum parametes to operate at their best. Some operating conditions concerns include themperature extremes, magnetic intereference, vibration & electromagnetic intereference among...

Christmas Lights Using LEDs

This is a circuit that can be used as for festive decorations. It contains eighteen LEDs that can be assembled as one's wish.

Ultrasonic Burglar Alarm

This unique ultrasonic burglar alarm makes use of the invisible, inaudible ultrasonic sound beam to detect movements. Ultrasonic transducers operate at maximum efficiency when...

Touch Based Doorbell

This touch plate doorbell makes use of enhancement-mode MOSFETs forming part of CMOS quad NAND gate CD4007B in conjunction with a detector and Darlington driver stage.

Bicycle Indicator

The electronic bicycle turn indicator unit described here uses low-cost components and is a good substitute to many commercially available versions. It works in...

Locker Guard

Protect your valuables from burglary using this simple locker guard circuit. It generates warning beeps when someone attempts to open the locked safe. The...

Bell-Cum Light Controller

This is a circuit for a bell and light controller that consists of a doorbell with porch light. When someone presses one switch, the bell rings and the light turns on for 3 minutes. Another switch turns on only the bulb for 3 minutes.

PC Table Lamp

This useful circuit is built around well-known timer IC TLC555. It activates an electric bulb when your PC is switched ‘on’. When you shut down the PC, the lamp also automatically turns ‘off.’

Seismic Sensor

This circuit detects the movements of humans or animals. Whenever it detects any movement, a buzzer starts beeping and a red LED starts to blink.

Water Tank Overflow Indicator

Simple Overflow Stopper For Water Tanks Stop Tank Overflow With Wireless Water Level Indicator and Controller Water Level Indicator Circuit (LED...
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