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Presented here is a simple filtering and polarity reverse protection guard for AC/DC power adaptors. Wall adaptors have many advantages because these are low-cost, have a wide range of output voltages and currents, are easily available, come with input...
This project is based on a capacitive touch sensor for controlling four electrical appliances. Toggle switches have been used for operating lights or fans, and momentary press switches for operating electric doorbells. Most of these switches are mechanical and...
Circuits like Geiger counters, insect zappers, Nixie tubes and sensors require high-voltage direct-current (HVDC) supplies. There are various types of HVDC power supply designs available in the market, including voltage doubler or quadrupler, flyback converter and boost converter. Some of...
Presented here is an Arduino-based noise/sound level monitor that displays sound levels in decibels (dB) and corresponding voltage levels on an LCD. A noise monitoring system is used in many applications such as healthcare, defence, mining, robotics and so...
In this project, an old Bluetooth headset can be used, along with a cellphone to make a robot controller, without a microcontroller (MCU) or any programming. Communication between the robot car and the smartphone is done via Bluetooth. This...
This circuit monitors light in surrounding areas at all times, displays light level on the LCD and sounds an alarm when light level becomes low. Such systems are being developed and used in such applications as healthcare, defence, mining,...
Electronic or flameless candles are an alternative to traditional wick candles. These are used for home décor and do not carry the risk of fire as these have LEDs that glow instead of an open flame. This project shows how...
This Arduino-based distance meter can be used for measuring the distance between the sensor and object in the range of 2cm to 400cm using an ultrasonic sensor. The author’s prototype and ultrasonic module are shown in Figs 1 and...
Stroboscope is a device used to make a cyclically moving object appear slow-moving or stationary. This is realised by illuminating the object intermittently with short pulses of light. Stroboscope is used in the study of insect flight. It can...
LM338 voltage regulator can also be used as an audio amplifier. The output voltage can be controlled by varying the IC’s reference voltage (pin 1), which is reflected as the output signal in the speaker. The IC can handle...