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Is there dpdt 1vots dc relay

Discussion in 'General Electronics Discussion' started by mrel, Dec 16, 2009.

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  1. mrel

    mrel

    103
    0
    Jul 2, 2008
    Hello
    Is there a DPDT type relay that only use 1 volts dc to close the contact when power is supply and another contact close when there no power to the coil.
    So far came across relay use 3 volts dc that is the lowest dc volts found.
    Need a relay that use only 1 volts dc, is there such a DPDT relay that use only 1 volts dc ?
    If there is no such relay , is there a circuit that using a chip to draw 1 volts dc that can replace 3 volts dc relay.
    Mrel
     
  2. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    I don't think any such is available, you'd have to wind it yourself.
    But 1V is plenty to hold a 3V relay, and 2V is usually enough to draw it.
    You can make a circuit with one capacitor, diode, transistor, & resistor that will double the 1V for a moment so the relay will draw.
    Careful selection of the components will have to be made, it's not trivial to make circuits work on such low voltages.
    Alternatively you could make an 1V to 3V inverter.
     
  3. jamygdala

    jamygdala

    6
    0
    Jul 13, 2009
    i've seen something akin to an isolated FET driver using a pulse transformer with appropriate turns ratio that may do this. Pulse on to draw it and 1V to keep it there. It might depend on how quickly the supply comes up to generate the 'ON' pulse. How long the pulse needs to be there and so on. Just some thoughts.
     
  4. neon

    neon

    1,325
    0
    Oct 21, 2006
    Never heard of reed relay need no power just magnetics to close?
     
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