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  1. #11
    Steve Smith's Avatar
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    Quote Originally Posted by Nicholas Lindan View Post
    It is possible to do it with no relays - but you don't want to try it as it has a good chance of making a short circuit
    That was going to be my suggestion. You don't need anything extra, just modify the timers so both internal relays are in series.

    But as the op is asking the question I assume he is not interested or able to do these sort of modifications.

    Quote Originally Posted by Nicholas Lindan View Post
    and violates every wiring code on the planet.
    There are no rules in the UK to prevent you doing this yourself in a domestic situation.

    The other option would be a parallel connection with separate on/off switches for each timer so only one was powered at a time.


    Steve.
    Last edited by Steve Smith; 05-16-2010 at 03:03 AM. Click to view previous post history.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  2. #12
    Nicholas Lindan's Avatar
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    Quote Originally Posted by Steve Smith View Post
    just modify the timers so both internal relays are in series.
    Wellllll, most timers only use one relay inside -- the NC contacts go the to safelight outlet and the NO contacts go to the enlarger.

    To do it with no relays you need to hook one timer up to the AC line in a backwards configuration (reversed Hot/Neutral or Brown/Blue wires) and then wire the safelight between the two Hot sides of the safelight outlets. Really not recommended.
    DARKROOM AUTOMATION
    f-Stop Timers - Enlarging Meters
    http://www.darkroomautomation.com/da-main.htm

  3. #13
    Nicholas Lindan's Avatar
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    Quote Originally Posted by Steve Smith View Post
    There are no rules in the UK to prevent you doing this yourself in a domestic situation.
    Your insurance may balk at paying if dodgy DIY wiring is responsible for setting the house on fire. In the US the 'National Electrical Code' is part of the housing regulations in most states and cities.
    DARKROOM AUTOMATION
    f-Stop Timers - Enlarging Meters
    http://www.darkroomautomation.com/da-main.htm

  4. #14
    RalphLambrecht's Avatar
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    Quote Originally Posted by clayne View Post
    ...Another alternative would be to say screw it and leave the safelights on all the time.
    There you go!
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  5. #15
    Steve Smith's Avatar
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    Quote Originally Posted by Nicholas Lindan View Post
    Your insurance may balk at paying if dodgy DIY wiring is responsible for setting the house on fire.
    I'm sure they would (if they knew) but there is nothing to stop you connecting whatever you like to a socket. From incoming supply to outlet there are regulations but no one is going to check or test anything you connect to an outlet yourself.


    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  6. #16
    Steve Smith's Avatar
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    Quote Originally Posted by Nicholas Lindan View Post
    Wellllll, most timers only use one relay inside -- the NC contacts go the to safelight outlet and the NO contacts go to the enlarger.
    Yes that does complicate it a bit. So far, your single relay method seems to be the best solution..... other than just using one timer and only plugging in one enlarger at a time.


    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  7. #17
    Steve Smith's Avatar
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    That's far too simple and elegant!


    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  8. #18
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    Trigger the same set of safelights from independent timers?

    Need to use the timers concurrently.
    Stop worrying about grain, resolution, sharpness, and everything else that doesn't have a damn thing to do with substance.

    http://www.flickr.com/kediwah

  9. #19
    glbeas's Avatar
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    You need to use a relay for each timer and run the coils separately via each timer and the contacts (normally open) in series on the safelight power line. The safelight is plugged into it's own wall outlet and the safelight outlets on the timers power the relay coils. All power circuits are separate from each other and no chance of a short circuit.
    Gary Beasley

  10. #20
    glbeas's Avatar
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    Each timer has an outlet that energises for the safelight. Use this to energise the coil of a relay for each timer. The contacts should be wired to an outlet daisy chain style (in series) so both have to be energised for the safelight to be on. The safelight plugs into this setup. I'd put the relays in a project box with clearly marked cords for the timer connections and a power cord for the safelight to plug in the wall and an outlet to plug the safelight in to. Heres a rough sketch. I could put together a working circuit in minutes if I had the parts on hand.
    It could easily be set up for a normally closed setup to actively turn off the circuit using the enlarger plug or with a normally open to use the safelight plug if available.
    Attached Thumbnails Attached Thumbnails schematic.jpg  
    Gary Beasley

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