LPG Sensor Module. Component Guide 3

mq6-gas-sensor-module2LPG Sensor modules are available now at low cost and we can use it in the Kitchen as a Gas leakage Alarm. The Module has a MQ6 Gas sensor, an Op-Amp as comparator and a preset for adjusting the sensitivity. All we need is a load resistor at the output to connect with the alarm circuit. Module is very sensitive to LPG (Liquefied Petroleum Gas) which contains Propane and Butane. The MQ6 sensor detects the gas concentration between 200 to 10,000 ppm.
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PIR Sensor Module. Component Guide 2

PIR-2 PIR Sensor Module is one of the new introductions in electronics which is a highly useful device to switch on lights when it detects a human movement. It turns on the lights from 30 seconds to 3 minutes depending on the preset adjustments. Its range can be as high as ten meters which can also be adjusted. The module gives a high output when it detects the human movement. This high output can be used to drive a relay through a switching transistor. Let us see the details of PIR sensor module.
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Trimpots. Component guide 1

MINIATURE-TRIMPOT Potentionmeters are manually adjustable variable resistors with three terminals. Two terminals are connected to the ends of the resistive element, while the third terminal is connected to a sliding contact called Wiper.So by rotating the wiper, the resistance of the Potentiometer can be adjusted to its maximum value. The position of the wiper determines the output voltage of the Potentiometer.Potentiometer is commonly called as “Pot meter” or simply “Pot”. “Log ( Logarithmic ) Pots” are used as volume control and “Lin ( Linear ) Pots” are used for other applications.Different materials are used as resistive material in Pots. This may be Carbon, Cermet, Wire wound, Conductive plastic or metal film. Usually, the value of the Pot is printed on its body. But the miniature “Trimpots” have codes to represent its value. For example, 102 (1K), 103 (10K), 104 (100K), 105 (1M) etc. Checkout the different types of Potentiometers.
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Evening Timer for Mosquito Repellent

Circuit-of-Evening-Timer-4Mosquito Repelling vaporizers are generally switched on throughout night to repel mosquitoes. This is not necessary because Mosquitoes become active during the evening hours for feeding. If it enters the home in the evening, it will bite in the night also if gets a chance. So the best method is to use the vaporizer in the evening hours. This circuit automatically turns on the vaporizer around 6 pm and keeps it on till 9 pm and after that, it switches of the vaporizer. This reduces the quantity of inhaling fumes and also increases the usage days of vaporizer. The circuit can be enclosed in the switch box itself.
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Radiation Sensor. Simple Design 27


This circuit tells you how much radiation is coming from electric devices. It picks up the AC hum from the surroundings of electric equipment and electric wiring and blinks the LED to show the radiation level. You can also use this to assess the safe distance from Computer radiation.
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LED Strobe Light. Simple Design 26

You can use this Flashing LED light for Projects, Model vehicles, Toys etc. It blinks in a peculiar fashion with bursting flashes.
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Spike Guard. Simple Design 25


This Tiny circuit can protect your LCD TV from Voltage surge at power on. It takes 2 minutes delay before connecting power to the TV. Within that time, mains power will become stable. Heavy inrush current at power on or when power resumes after a power failure can damage the TV permanently. If few minutes delay is provided, the AC will become stable. This is the delay technique used in Stabilizers.
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