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Topic Review (Newest First)

  • March 4th, 2012, 11:55 AM
    5 volts, will slowly destroy most LEDs.
    At least any of the red, green, and yellow, ones on a computer.

    They are 2v

    I think Blue,and White uses 4v
    Match your wire size to the amps, and 12' shouldn't matter.

    Those LEDs draw nothing to speak of, though.
  • March 3rd, 2012, 11:18 AM
    How does the circuit change if I wanted to instead power an LED rather than the line voltage? Do I need the Relay at all? I would think in this situation I'd have, in series, the 5V DC power source, a resistor, 1 or more LEDs, the magnetic switch.

    This seems really simple. Any concern with the length of the DC circuit? The switch would be located about 12 feet from the light.
  • March 3rd, 2012, 09:29 AM
    Security System / Burglar Alarm Components - Structured Home Wiring

    you can use the door or the window contacts ,prefer window thou.
    use 22awg or 18 awg wiring for the low voltage side [ can be expose ]

    i think you would have better luck finding a relay with a 12 V or 24 V [ AC ] holding
    coil than a DC one [ a bell transformer will work to power the coil]
  • March 3rd, 2012, 12:03 AM

    Simple Relay Switch - Need Diagram Help

    I've never created a circuit before, so please forgive the ignorance.

    I am wanting to create a circuit that will switch a light on / off depending on the open / closed state of a door. I've done some research and believe that I need to use a relay circuit with a magnetic switch. I've found some sample diagrams that map this out, but none of them list out the part numbers.

    The load will be a line voltage outdoor light.
    The DC voltage will be whatever phone charger I can cannibalize, but I see the standards for the relays are 5, 9, or 12VDC, so I'll try to match this.
    The magnetic switch will be of the NO variety.
    I believe the diode needs to be 1N4148.
    No idea on what type of relay I would need.

    Am I missing anything?

    All in all, this seems really simple, but I don't want to fry anything.

    Thanks in advance.

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