Thursday, December 2, 2021
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A simple explanation for the working of an ideal diode circuit based on P-channel MOSFET and PNP transistor is presented here. The typical voltage required to turn on a diode is forward voltage. An ideal diode should have zero...
Infrared (IR) remote-controlled RGB bulbs available in the market are extremely expensive. Here is a simple, easy-to-build and inexpensive circuit built using Arduino Uno R3. The project demonstrates how to turn on/off or vary the colours of an RGB...
This article describes how to decode a remote controller and use it for home automation, along with Arduino. An infrared (IR) remote controller used in TVs, music players and the like uses IR rays for sending information or data...
Most textile retail stores have trial/changing rooms for customers to try on new clothes before buying them. These rooms are illuminated all day long, irrespective of whether these are being used or not. This leads to wastage of electricity. Presented...
Described here is an electronic system for stopping tank overflow. It is capable of keeping the water-level between any two of the eight predetermined levels, starting from the bottom to the top of the water tank. The technique The system uses...
Most commercial torchlights use three AA or AAA cells connected in series, which produces 4.5V to drive white LEDs using a current-limiting resistor. These flashlights do not drive the LEDs efficiently due to lack of a current-control circuit. Presented...
Here is a simple joystick to control a robot to move in forward, backward, right, left, clockwise (CW) and counter-clockwise (CCW) directions using six buttons. It is cheaper than most other joysticks available in the market. The author’s prototype...
Here is how we can build a 5W stereo audio power amplifier based on TEA 2025 IC and two potentiometers for left and right volume controls. Its power output is 2.5W on the left and right channels each with...
A tachometer measures the rotation speed of motors and other machinery. There are various types of tachometers. Described here is a digital non-contact type tachometer using a proximity sensor. Circuit and working The circuit diagram of the Arduino-based tachometer is shown...
This toy organ for children uses a readily-available force-sensitive resistor (FSR) and an NE555 timer IC. Resistance of the FSR varies with the amount of force or pressure being applied on its surface to play the toy organ. Circuit and...