How Cell Phone Detector Works

What is Cell Phone Detector?We are most familiar with cell phone active detectors. The cell phone detectors are mostly hand and pocket-size mobile transmission detectors. It can sense the presence of an activated mobile phone from a distance of one and a half meters. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc.Use of Cell...

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Gas Sensor Application & Features

Gas sensors are a basic component in many security systems and modern methodology, providing key quality control feedback to the system. And these are available in wide specifications depending on the sensitivity levels, type of gas to be sensed, physical measurements and various different elements.Gas sensors are generally battery operated. They transmit warnings via a...

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Relay control using Table clock

This circuit can switch on / off a load when the set time arrives. It can be used to switch on AC loads such as TV, Radio, Music system etc. Its triggering pulse is obtained from a small table clock. The switch on / off the time can be set manually through the alarm setting of the clock. Optocoupler IC MCT2E is used as the link between the clock and the circuit. The...

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Fridge Timer

Presenting here a circuit for energy saving. It is for your fridge that consumes large quantity of power during peak hours between 6 pm to 9 pm. The condition worsens if there is low voltage in the domestic lines. So the better way to save energy and money is to switch off the fridge during peak hours. This circuit will help you for that. It automatically switches off...

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Over Voltage Protector

Here is a simple over voltage protector circuit that breaks the power to the load if the voltage increases above the preset level. The power will be restored only if the voltage drops to normal level. This kind of circuit is used in voltage stabilizers as over load protection. The circuit uses a Zener controlled relay driver to cut off the power in the over voltage condition....

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Simple DC-DC Converter

Presenting here a simple DC-DC converter circuit to power various DC operated circuits. It can provide DC power supply up to 18 volts DC. You can simply select the output voltage by changing the value of the Zener diode ZD. The circuit has both voltage and current regulation. Input voltage for the circuit is obtained from a 18 volt 500 mA transformer based power supply...

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Portable Emergency Light cum Mobile Charger

Here is Portable Emergency Lamp cum Mobile charger. It uses a high bright White LED that can give sufficient light in the room when the mains power fails. It can be also used as a Mobile charger in the plug in mode as well during journey. Power supply for the circuit is derived from a 0-6 volt 300 mA step-down transformer , a fullwave rectifier comprising D1 through D4...

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Secure Communication Using 3-Pin RF Module

Secure Communication Using 3-Pin RF Module July 27, 2013 by Team ElProCus Leave a Comment About RF Module: In generally, the wireless systems designer has two overriding constraints: it must operate over a certain distance and transfer a certain amount of information within a data rate. The RF modules are very small in dimension and have a wide operating...

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Musical Door Bell

Here is a Mini project for students. This is a simple battery operated Music bell circuit that generates a sweet melody for one minute when it is triggered. It uses the ROM IC UM66 to produce the melody. The music stops automatically.A push switch is used to trigger the circuit. When the push switch is pressed momentarily, NPN transistor T1 conducts and pull the base of...

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We all know that breathing an oxygen rich liquid is an old idea which does have some advantages but it has more detriments than benefits. For example the removal of carbon dioxide from bloodstream becomes a big problem, which ultimately leads to many other problems. So the Researchers at Boston Children’s Hospital came up with a new idea! They created micro-particles that...

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