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  • Eco Friendly Metal Detector - Arduino

    Thanks for fixing the resistor position.Comparators compare voltages. Since the transistor draws current, there will be a voltage across its collector resistor, so the collector voltage will almost always be less than the supply voltage. In extreme overdriving conditions, it may equal the supply, but never exceed it.I would try biassing the + input of each comparator to 2.5 volts. Just two 10k resistors. This should allow the input signal to swing on either side of this voltage and probably increase sensitivity but avoid having to be lucky with the choice of comparator chips.This is an exciting project. Hope it works out well.

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  • Eco Friendly Metal Detector - Arduino

    If you try this, you should know there are errors in the circuit diagram.The 1M base bias resistor does not go to the base.It should be connected between collector and base in each of four transistors.Also, the comparator circuit will do nothing as shown. The -input will never be more positive than the +input, so no output will be obtained.The author might consider correcting these if he agrees.

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  • jackal1455 commented on Keanu123's instructable Modern Traditional Aussie Damper2 years ago
    Modern Traditional Aussie Damper

    Centigrade is now called Celsius, named after a Swedish astronomer.You say "degrees Celsius" for an actual temperature, but "Celsius degrees" for a difference in temperature. Same as Fahrenheit.Celsius temperature and grams, meters and liters are metric units for temperature, mass, distance and volume although kilograms and kilometers are used for larger masses or distances.Cups are used in some recipes although a standard cup and a random coffee cup may not have the same volume. So using weight measured on a scale is more exact.

    The temperature was 190°C.To convert, multiply by 1.8 then add 32.So 190°C times 1.8 = 342 plus 32 = 374°FDamper is a camper or hiker bread in Australia. Normal bread is like US bread except with less sugar.

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  • Cheap and Effective Light Switch Extenders for Kids

    Thanks for checking that.I checked the light switches in our house with my non-contact mains voltage detector. About half of them had mains voltage within a millimeter of the front of the switch. In our case this is 240 volts.So, sudden death to anybody who drills holes in the plastic and puts metal eye screws in the holes.DO NOT DO THIS. YOU COULD DIE.

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  • Cheap and Effective Light Switch Extenders for Kids

    I wish it was.Just under where he drilled into the switch, there is one end of a compressed spring. The other end operates a rocking piece of metal which switches the Mains voltage.The spring would usually have mains voyage on it.Your switches may not be like that, but if they are, drilling holes into the switch and inserting metal objects creates a death trap.

    Auto spell turned 'mains voltage' into 'mains voyage'.

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  • Cheap and Effective Light Switch Extenders for Kids

    That would probably be illegal in most countries.You would be touching those metal parts quite often and you would have no way of knowing if they had high voltage on them.Even if yours was safe, how do you know what switches your readers would be drilling holes into?Why not use hot glue to attach a plastic lever to the switch?You could then just drill holes in the lever or do anything else to it, but safely.

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  • jackal1455 followed AntMan2322 years ago
      • PICAXE Raspberry Pi ADC
      • Raspberry Pi I2C (Python)
      • Arduino stepper motor and servos shield - AW GCSE Board
  • jackal1455 followed NicolasJ72 years ago
      • Arduino& Labview With 2 DS18B20
      • Arduino/Android Timer (with App!).Control your lights and other stuff
      • Every Liter Counts! Arduino Water Doser "Shield"
  • jackal1455 commented on electotherescue's instructable Quickie: Wobbly Fan Repair2 years ago
    Quickie: Wobbly Fan Repair

    Fans will also wobble if the blades have been pushed to different heights. They should be at the same height. Don't clean fans with a broom.Kids: get your parents to try this. Don't do it yourself. Turn the fan off before checking the blade heights or trying to bend the blade supports. Push a ruler, a book or a drink bottle against the ceiling and rotate the fan by hand to check the height of each blade.Check heights of all blades before turning the fan on.

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