Components, Electronics, Electronics Theory, Home Circuits, How components work, Power Supply, Techniques, Utility Gadgets

AC Powered PIR Light


A Simple design of PIR Light using Tranformerless Power Supply and Triac for driving the load. Too compact and can be enclosed in a small case. The light turns on when the PIR sensor detects human movement and turns off after the preset time. Re triggers in another movement. Its range is 30 cm to 10 meters and time delay, 30 seconds to 3 minutes both can be adjusted using the presets in the PIR sensor Module.

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Circuit, Components, Electronics, Electronics Theory, Home Circuits, How components work, Power Supply, Utility Gadgets

Wireless Electricity Generator


Wireless Electricity Generator
Here is a High Efficiency Wireless Electricity Generator project. Usually we make a simple wireless electricity generator to light 1.8 volt Red LED. But here the efficiency of the Wireless Electricity Generator is increased to light 1 Watt White LED Bulb that requires 3.6V. It generates voltage and current even to light a Strip LED. Try it and see the wonder of LED lighting without a battery connection.

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Electronics Theory, Hobby Circuits, Home Circuits, How components work, Utility Gadgets

PIR Sensor Alarm


PIR Sensor Alarm

This simple alarm can be used to detect the movement of human beings at a distance of 10 meters. It works both day and night and beeps shortly when there is a human movement through its detecting range. It is ideal to monitor the entry passages, stair case, corridors etc. It is highly useful to monitor the human movements in Flats, Multi storied buildings, Shops etc. A relay can also be connected for activating lights, electric alarms etc. It can be used as a Personal alarm during journey to protect luggage.
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Circuit, Components, Electronics Theory, How components work, Power Supply

Power regulation using IC


Voltage regulation through Fixed Voltage Regulator IC is the most suitable method.78xx series positive and negative regulators are widely used to get fixed voltage to drive loads. Here explains a circuit design to get regulated voltage from a 12 volt 500 mA power supply .This circuit can deliver 5 volts at 300 mA for driving a load.

The circuit is Voltage and Current regulated and with Polarity and Surge protection components.
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Articles, Circuit, Components, Design, Electronics, Electronics Theory, How components work

How to select resistor for 1 watt LED


1 Watt LEDs are widely used in Emergency lights and LED lights. Most of the circuits use 4 volt battery having 0.5 to 4 Ah capacity. The 1 watt LED is rated 3.6 volts maximum so we need the correct value resistor for LED to get maximum brightness. Let us see how the LED resistor value is determined.
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Articles, Circuit, Components, Design, Electronics, Electronics Theory, How components work, Power Supply, Techniques, Utility Gadgets

How to connect Relay with NPN and PNP transistors


Transistor is used to drive relay to connect AC loads. For efficient working, it is important to connect the relay correctly in NPN and PNP transistors. See the way of connection. Continue reading “How to connect Relay with NPN and PNP transistors”

Circuit, Components, Design, Electronics, Electronics Theory, Hobby Circuits, How components work, Techniques, Utility Gadgets

How to connect 7 segment display in circuits


7 segment display is used in Counter circuits, Temperature sensing circuits, Timers, Clock circuits etc. Let us see its pins and way of connection Continue reading “How to connect 7 segment display in circuits”