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hotwaterwizard

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  14. mercury switch

    in Datasheet/Parts requests

    Posted

    Okay, here is my solution.
    A sump pump has a switch that will make contact when it is up or down depending on the position of the contacts. They are no longer leagal to use Mercury in them. They came up with a simple solution.
    They have a ball bearing that rolls into a switch like they described in one of the previous reply. The whole assembly is inside of a plastic ball that floats on top of the water. The wire is tied to a pipe so it will move only up and down. When the water level drops to a set level the ball bearing rolls down and pushes on the switch, The key here is to use a ball bearing that is heavy enough to activate the switch but not heavey enough to break it when it rolls. Another way is to use the following diagram instead.

    post-787-14279141593524_thumb.jpg

  18. Voltage Multiplier

    in Theory articles

    Posted

    Let's compare a Capacitor to something Common say a Water Filter in a Swimming Pool.
    As the flow of water goes into the filter it is slowed down by the filter cartridge. The Water Flow is like Current in electricity and the Water Pressure is like Voltage.The speed at which it is slowed down depends on how many microns the filter is. The filter also removes unwanted impurities in the water . The unwanted impurities in Electricity are voltage spikes, unwanted AC voltages. Ect.The amount it removes also depends on the microns of the filter. If the holes in the filter are big then the water will not come out as clean. With a Capacitor the bigger holes are a lower microfarad. So a larger microfarad would be the same as a finer Micron Filter cartridge in the Pool Filter.
    In the pool filter the smaller the holes are the higher the pump pressure remains.,
    The same can be said about a Capacitor. The voltage will stay higher for a longer time with a large capacitor.

  20. Car Burglar alarm

    in Electronic Projects Design/Ideas

    Posted

    I made something like this once.
    Here is how I did it. I bought a Tape that goes into an answering machine. It was a tape that has an endless loop. The one for the Greeting Message. I recorded my message with the answering machine. Then I installed a 12v car tape player under the dash board. I hooked the hot side to my Headlight switch and the negitive to the Dome light switch. When ever I opened the door with the headlights on it told me" You left your headlights on!" in my own voice.

  22. Heeeeeeelp!!

    in Electronic Projects Design/Ideas

    Posted

    Look at this one too!
    If you set the first one for 2 seconds then the incroments will be 2,4,6,8,10,12,14,16,18,20.
    If you only use the 2 thru 12 settings You will have the first step of your request filled. As for the other step just change the value of C1 so it is a 15 second interval instead of 1 min. My guess would be between 47uF to 100uF.
    (You must tie the unused outputs to ground because they will pick up stray signals and cause erratic operation and cause excessive power consumption.)

    post-787-14279141588936_thumb.jpg

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