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  1. #21
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    http://www.apug.org/forums/forum379/...g-chamber.html

    The universal carrier is an absolute steal at this price!

  2. #22

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    Still stuck with this months on. I've included some pictures, I'm just really not sure what to do. One of the pictures has the input and lamp voltages; if I can skip the regulated power supply as previously suggested (since I'd only be printing black and white) that would be great.

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  3. #23

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    Going from memory here - but there is only one screw/knob on my 7700 to open the back & top of the lamp housing. Once inside, you'll see it's a standard halogen or similar (they are easy to get from audio/visual stores, or on ebay).

    My enlarger has a simple cord running from here to an external transformer -- nothing special, just 240v to 12v. As I said, you can buy these pretty much anywhere.

    Depending what yours is configured for, this transformer may be all you need to turn it from 120v to 240v. Just check the lamp itself to figure out what transformer to get...

    http://jaycar.com.au/productView.asp?ID=GH1379

    Happy to help if you have more details.

    cheers,
    Raoul.

  4. #24
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    What a strange operating voltage for the lamp!!

    Well, given power = voltage x current, we know 85 = 82 x current, which means current = 85/82, which is 1.037, or slightly over 1 Amp, so you really want a power supply (or step-down transformer) capable of sourcing more than that. Something like this 2.2A one http://www.jaycar.com.au/productView...n&form=KEYWORD would be ample...

    Other than that, you would need a sparky to do some extensive rewiring so you could use the Australian mains power directly, with an easily available lamp. If you were planning to use the enlarger forever, that might be a more prudent investment in the long term - i.e., when you can't find an 82v halogen lamp...

    Cheaper still would be another enlarger, but that may require some patience

    Marc!
    Marc Morel
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  5. #25

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    Marc/CaptHowie,

    the rewiring is trivial - if this is the same as my 7700. A standard halogen transformer will do the trick.

  6. #26

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    So the options are either a 12V DC adapter or to use a 220/240V -> 120V Step-Down Converter; a few questions with these two approaches. In regards to the 12V adapter, how would I connect the adapter up to the enlarger or a timer? The enlarger uses a grounded US electrical plug, but I notice the adapter on Jaycar uses a two-pin connector. Would I have to strip the wire and solder an Australian AC female plug to the adapter? Also, if the lamp only needed 12V why would it mention the 82-85W on the back plate? In regards to a step down transformer, I know the input on the back plate is 120V AC, but how would that work with the 82-85W mentioned for the lamp, or if the lamp was 12V?

    Thanks for the help

    Edit: Also, the halogen transformer mentioned, what would be an example of this?

  7. #27
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    Presumably, if the enlarger originally ran off a US 120VAC supply, it has a transformer in it, or other electronics (voltage divider, regulator, etc) to provide the lamp with the correct voltage. If you were to replace the lamp/supply with a 12V system, you would need to bypass all that: you would connect the 12v transformer between your timer and the enlarger.

    An example of a Halogen transformer could be the one Raoul linked to, or a domestic switch mode device like you find in the ceilings of modern homes - as long as it's rated at the same current (domestic transformers often supply 11.5V instead of 12, and so the lamp lasts longer, runs a bit yellower!)

    Marc!
    Marc Morel
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  8. #28

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    Yes - wire the transformer straight to the lamp on one end -> it then plugs into your timer. Simple.

  9. #29

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    Ok, I think the C6700 and the C7700 are exactly the same electrically. I've attached the manuals which have the specifications, and both have 12V 100W Halogen lamps, and the power supply is listed. If you could confirm that would be great Thanks for all this help, doubt I would have figured it out.

    http://dl.dropbox.com/u/10765/C6700.PDF
    http://dl.dropbox.com/u/10765/LPL_C7...Manual_OCR.pdf

  10. #30

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    Buy a 12v transformer as indicated.

    On page 5 (6700) - picture 10, part 19 is the lead from the new transformer. Discard anything else that was there before.
    On page 6 - picture 1, note the transformer, this is now your new halogen transformer. use this in the exact same way as pictured.

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