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    Here are the top 10 electronic circuits of January 2013. This top is made using data from Google Analytics. I hope this year I will publish it every month.

    January 2013 Top 10

    Security light and switch with PIR
    This is a simple update to Mr. Hareendran’s PIR Sensor Security Light circuit. It has a shortcoming limits the relay voltage to approximately 3.3V.
    Gas leak detector
    Here is a gas leak detector circuit that detects the leakage of LPG gas and alerts the user through audio-visual indications. The circuit operates off a 9V PP3 battery.
    Dog repellent
    The electronic dog repellent circuit diagram below is a high output ultrasonic transmitter which is primarily intended to act as a dog and cat repeller, which can be used individuals to act as a deterrent against some animals.
    S-Video to RCA cable
    The SVideo to RCA cable is sometime hard to find and the adapter is almost every time too short. I’ve searched at my local store and haven’t found any.
    Motion sensor switch
    he motion sensor switch circuit can automatically turn on a water sprinkler but you can easily use it as a motion sensor light switch or motion activated alarm too.
    Homemade metal detector
    This homemade detector circuit will help you find objects composed of materials with relatively high magnetic permeability. It is not suitable for buried coins discovery that is not sensitive enough but you can detect pirates treasures!
    110V/220V AC to DC converter
    This 110V/220V AC to DC converter circuit is capable of converting an alternative voltage within 70V – 260V range into a DC voltage within 180V to 350V DC range
    Automatic battery charger
    A 12 volt lead acid battery charger that shut off the charging process once the battery attains full charge. This prevents overcharging of the battery so that, the charger can be left unattended.
    Solar battery charger
    This is the most simple and affordable solar battery charger that the hobbyist can make. It has a few drawbacks over other similar controls, but offers numerous advantages.
    Solar charge controller
    This Low Dropout Voltage (LDO) solar charge controller uses a simple differential amplifier and series P channel MOSFET linear regulator—their compatibility seems like a marriage made in heaven. Voltage output is adjustable. It is mainly intended for charging 12V lead-acid batteries.

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