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Timing Board

Discussion in 'General Electronics Discussion' started by electrdave, Apr 2, 2010.

  1. electrdave

    electrdave

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    Apr 2, 2010
    Hi all,
    I have a timing board that sequences 9 separate 120v outputs. These outputs are normally off. The triacs used are NTE-5652's. I would like these outputs to be normally on and momentarily turned off instead. Any ideas which triacs to replace these with?
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    You need to change the timing. It is not something that is dependant on the triac.
     
  3. electrdave

    electrdave

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    0
    Apr 2, 2010
    Hi Steve,
    I probably didn't give enough info first time. This board was originally used to fire off solenoids one at a time. All outputs are sequenced 1 at a time, on then off then on to the next one. How fast all are cycled through and how long each output is on depends on the adjustment of 2 pots. I want to use it for Halloween to make lights appear to 'blink' (like eyes). I could do the same by adding a relay to each output and using the N.C. side but wanted to avoid all the clicking sound. Hope this helps, Dave
     
    Last edited: Apr 2, 2010
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,178
    2,690
    Jan 21, 2010
    If it's designed to fire off solenoids one at a time then you'll have to change the design to make it turn things off one at a time.

    A relay attached to each output is an option (but you have already indicated it is not your preferred option).

    If you have a circuit diagram of the device, it *may* be possible to suggest modifications to change the way it works.
     
  5. electrdave

    electrdave

    4
    0
    Apr 2, 2010
    No circuit diagram, I think I will just add relays as I don't want to risk damaging this board. I found some cheap ones at AllElectronics. Thanks for your help though.
     
  6. Resqueline

    Resqueline

    2,848
    1
    Jul 31, 2009
    I just found out that there are Solid State Relays that have normally closed outputs, but the ones I found were for DC..
    It should be possible to build a normally closed triac triggering circuit though, with a transistor, resistor, capacitor, & diac.
    If your timer only supplies trigger pulses instead of steady DC it would complicate matters a little, but could still be done.
     
    Last edited: Apr 3, 2010
  7. electrdave

    electrdave

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    0
    Apr 2, 2010
    Thank you, I will look into that
     
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