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Switch for AC and DC??

Discussion in 'Electronic Basics' started by Robbie Banks, Jul 29, 2003.

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  1. Robbie Banks

    Robbie Banks Guest

    Any suggestions as how to form a solid state switch that can be used to
    isolate either a AC or a DC supply?

    I was previously warned off using a Triac. Any other suggestions.

    Getting rather desperate now......


    Cheers
    Robbie
     
  2. A E

    A E Guest

    What does 'isolate either a AC or DC supply' mean? And what does 'form a solid
    state switch' mean?
    Well, what is it exactly you want to do? Do you mean a power switch? A simple
    switch, when in the OFF position, will isolate a AC or DC supply from its load,
    or its source, but you didn't say what you want to isolate it FROM, or even why.

    If a linear mains-operated power supply has a transformer in it, it's isolated.
     
  3. Robbie Banks

    Robbie Banks Guest

    Sorry for the ambiguity. What I want to do is have a power switch for a lamp
    that is controlled from a TTL pulse. However, the power supply to the lamp
    will either be 110V AC from a portable generator, or 12V DC from a leisure
    battery.

    Therefore, I would prefer to have a single circuit capable of switching
    either AC or DC.

    The reason I don't want to use Relays is that the enviornment that this is
    to be used in is prone to vibration and I'd prefer to take any mechanical
    switching out of the equation.

    Does this help clarify?

    Robbie
     
  4. Solid state relays for both types of power exist, but I've never
    seen one that can do both in one package, or one that can be jumpered
    from one to the other.

    My advice, if you need to switch AC & DC in the same package,
    would be to steer away from the 'solid state' part and simply use an
    electromechanical relay. Such have become very reliable in the past
    decade or so, as advances in contact materials have been made.

    If you're really finicky about reliability, get a relay that has
    silver or gold plated contacts. Phosphor-bronze with silver is nearly
    ideal for both low-level and power.
     
  5. A E

    A E Guest

    What kind of lamp works on 110V or 12V?
    Sounds like a job for a UPS. Just use the 12V battery inside a UPS of your
    choice that gives 110VAC.
    Why? It's ideal in this case. It's rugged, simple and reliable. What kind of
    vibration?
     
  6. happyhobit

    happyhobit Guest

    Robbie, what is this for?

    Is this for the lights inside an RV?

    Jay
     
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