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optoisolator

Discussion in 'General Electronics Discussion' started by FlashCreated, Apr 3, 2010.

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  1. FlashCreated

    FlashCreated

    24
    0
    Mar 22, 2010
    hi,

    Does anyone know of an optoisolator that can switch 240V 1A (mains) with 5V 2.5mA (parallel port)?

    thanx in advance!!!

    FlashCreated
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,490
    2,831
    Jan 21, 2010
    Look at the specs of some Solid State Relays.

    Here is an example which *might* suit your requirements.
     
  3. FlashCreated

    FlashCreated

    24
    0
    Mar 22, 2010
    wow thanx!
    How many mA do i need to switch it?
     
  4. FlashCreated

    FlashCreated

    24
    0
    Mar 22, 2010
    good god!
    just saw the price... is there not a cheaper soluton?
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,490
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    Jan 21, 2010
    looks like 10 to 15mA. You'll need to use the parallel port output to switch a transistor, and somewhere you can grab the required current from.

    5 bucks? That's cheap!
     
    Last edited: Apr 3, 2010
  6. FlashCreated

    FlashCreated

    24
    0
    Mar 22, 2010
    well thanx!
    if i'm using a transistor circuit isn't it essayer to use a relay?
    and it's 7 buck, need 8 of them, and i live in france.
     
  7. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,490
    2,831
    Jan 21, 2010
    You could use a transistor and a relay, but then you'd need far more current to pull in the relay.

    In addition, if you're switching the load very rapidly on and off, you may have to consider the mechanical wear on the relay.

    This one is $5 :)

    Hey, the Euro's pretty strong against the $US. Just be glad you're not in Australia!

    You might be able to use something like this at $US2 each.
     
  8. FlashCreated

    FlashCreated

    24
    0
    Mar 22, 2010
    can i use a triac?
     
  9. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,490
    2,831
    Jan 21, 2010
    You did say you wanted it opto-isolated.

    Yeah, sure, you could get a bunch of opto-isolated triac drivers and use them to trigger triacs.

    It may work out a little cheaper than the SSR's.
     
  10. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    You should be able to get these 100mA opto triacs for a half to one euro.
    Their max trigger current is specified at 5mA but are likely to make do with less than 3mA. There are others that require even less but they may be more expensive.

    Random phase trigging:
    - 400V; EL3023
    - 600V; EL3053

    Zero cross trigging:
    - 400V; EL3043
    - 600V; EL3063
     
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