It's often necessary to power a low voltage circuit such as a microcontroller with HV AC line current. For example, most fire alarms are powered this way. In these situations, a transformer is both bulky and expensive especially if the device is a consumer product.
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Transistor Schmitt Trigger
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The Schmitt-trigger is a circuit which creates hystereses and which is useful in digitizing an analog signal into a digital signal of either high or low. The hystereses makes inputs more immune to noise. The input must surpass a low threshold voltage before the output goes low, and likewise the input must exceed a high level threshold before the output goes high.
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XNOR Gate Circuit Diagram
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XNOR or EX-NOR gate is a digital logic gate, designed for arithmetic and logical operations. Here we are going to use 74LS86 chip for demonstration, this chip has 4 EX-OR gates in it.
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LM386 Audio Amplifier Circuit
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LM386 is a low voltage audio amplifier and frequently used in battery powered music devices like radios, guitars, toys etc. The gain range is 20 to 200, gain is internally set to 20 (without using external component) but can be increased to 200 by using resistor and capacitor between PIN 1 and 8, or just with a capacitor.
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Digital Dice Circuit
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Dice is used to play many games like snake ladder, Ludo etc. Generally dice is made up of wooden or plastic, which gets deformed with time and become biased. A Digital dice is a good alternative of old fashioned dice, it can’t be biased or deformed.
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H-Bridge Circuit
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H-bridge is the circuit in which voltage can be applied across the load, in either of the direction. These circuits are frequently used in robotics, especially for the DC motor. Voltage can be applied in either direction to rotate the DC motor forward or backward
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Dark and Light Detector Circuit
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In this project, we are going to make a day and night indicator (or dark and light indicator) which will indicate if there is a dark or light in the surroundings. Some applications of this circuit, are street light controlling, home/office light controlling, day and night indicators, etc.
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NAND Gate Circuit
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This gate is mainly used in applications where there is a need for mathematical calculations. So calculators, computers and many digital applications use this gate.
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Arduino automatic water system to wet your plant
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This project can be useful when we are at home and want to take care of our garden; In fact, from their iPhone / smartphone, you can drive a small pump that can dampen our flowers / plants. Let 'need:
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SIMPLE ARDUINO ULTRASONIC SENSOR DOOR ALARM
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Today I decided i wanted to build an alarm for my room, when I searched online all door alarms used the PIR sensor, unfortunately mine was faulty.
and that"s when I decided to build my own alarm using an ultrasonic sensor (HC-SR04),and I found out it was really simple.
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