10 second fixed timer circuit for ac 220 v

Discussion in 'General Electronics Chat' started by sandy2069, Jun 18, 2012.

  1. sandy2069

    Thread Starter New Member

    Jun 18, 2012
    2
    0
    Hello frnds,

    I need to develope a very compact timer of 10 s delay.
    the input voltage is 220 V AC, and load is 100 mA solenoid coil.

    Is there a way that i may develope it without a stepdown transformer, and DC conversion. Because without them my circuit will be very compact.

    May be there are some relevant circuits on this forum, but i did searched sincerely before posting new thread.

    Kindly help:)
     
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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  3. sandy2069

    Thread Starter New Member

    Jun 18, 2012
    2
    0
    thnks,
    hv all ready searched such products and following are othr such options.

    http://precisiontimer.thomasnet.com/category/on-delay-timers?&bc=100
    http://www.ia.omron.com/product/family/208/index_fea.html

    But i need to develope it on my own as the shape where I want thsi to install is peculiar and i need to customise it. So i just need the circuit help.
    I have seen some circuits where a diode,zener diode and RC circuit and power trasistor is used for this. But i need explanation and little more help

    Thnks
     
  4. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    969
    This board does not allow "transformer-less" mains powered circuit discussions for safety concerns.
     
  5. BSomer

    Member

    Dec 28, 2011
    433
    106
    Show us the circuit to which you are referring to and maybe we can help you understand them. However, as mcgyvr has pointed out, transformerless power supplies and such are not a topic allowed for discussion on this forum.
     
  6. #12

    Expert

    Nov 30, 2010
    16,246
    6,738
    I know how to do this but it is forbidden on this site.
    It's possible. Try electro-tech-online.
     
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