How to convert an 110V AV receiver to be used on 220V ?

Discussion in 'General Electronics Chat' started by evolutionX, Aug 23, 2008.

  1. evolutionX

    Thread Starter Active Member

    Aug 22, 2008
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    Is there a simple method to convert an 110V AV receiver to 220V ? I think the factory uses the same power transformer for both the european and US market ?
     
  2. hgmjr

    Moderator

    Jan 28, 2005
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    One way is to use stepdown transformer.

    hgmjr
     
  3. evolutionX

    Thread Starter Active Member

    Aug 22, 2008
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    that's not a good solution, because the transformer is heavy and the shipping from US to Europe is expensive, it's also big and impractical.
    Isn't it possible to modify the AV receiver to use it's own transformer with 220V ?
     
  4. SgtWookie

    Expert

    Jul 17, 2007
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    The only thing we currently know about your situation is that you have an AV receiver designed for 110V, and you want to run it on 220V.

    That isn't a whole lot to go on.

    Is it too much to ask to supply a manufacturer's name and model number?
     
  5. evolutionX

    Thread Starter Active Member

    Aug 22, 2008
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    Denon AVR-2809 or ONKYO TX-SR705
     
  6. Audioguru

    New Member

    Dec 20, 2007
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    I didn't find their schematic but I bet the transformer has two primary windings. In series they are for 220V and in parallel they are for 110V.
     
  7. evolutionX

    Thread Starter Active Member

    Aug 22, 2008
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    I have a european Denon AVR-1907 which is designed to work with 220V, on the transformer it's written Denon Power Transformer 5133333, can you find this ?
    I'm curious if this is the same transformer as in the 110V version. :)
     
  8. sastad

    New Member

    Aug 28, 2008
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    Hi
    I have a denon avr-788 which i think is the us version of avr-1908. On the power transformer it says 5133333, so i think it´s the same.
     
  9. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
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    Why would a transformer need to be shipped from the US to Europe rather than bought locally?
     
  10. sastad

    New Member

    Aug 28, 2008
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    i asked denon about using foreign voltage, and here´s the answers:

    Customer (me) 08/27/2008 04:55 PM
    Hi
    I have a Denon AVR-788 receiver. Is it possible to use this with 230 V 50 Hz ?

    Response (Ean Levy) 08/27/2008 05:12 PM
    Yes, but you will need to use a step down transformer.


    Customer (Svein Astad) 08/28/2008 01:58 PM
    Is it possible to change the internal transformer?

    Response (Ean Levy) 08/28/2008 02:03 PM
    No.

    That´s it.
     
  11. evolutionX

    Thread Starter Active Member

    Aug 22, 2008
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    They won't tell you that you can mess with the internal electronics, even if the US and European model shares the same power transformer.
     
  12. RmACK

    Active Member

    Nov 23, 2007
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    Are you able to remove the cover & upload a photo of the transformer?
     
  13. evolutionX

    Thread Starter Active Member

    Aug 22, 2008
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    sure, I have attached 3 photos
     
  14. SgtWookie

    Expert

    Jul 17, 2007
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    Well, just a wild guess suggests that the yellow and black are the primary windings. However, you have the two reds and a yellow coming from the other side (nearest the corner). Those might be high current, high voltage secondaries for the amp output. However, you'll have to do some circuit tracing to figure out what they really are. A wrong guess here will mean repair costs that will make the 220v-120v step-down transformer dirt cheap by comparison.
     
  15. evolutionX

    Thread Starter Active Member

    Aug 22, 2008
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    but I don't know if the step down tranformer makes the US 60Hz to 50Hz conversion
     
  16. SgtWookie

    Expert

    Jul 17, 2007
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    Actually, 60Hz vs 50Hz shouldn't really matter that much, unless the 60Hz portion was being used for a clock display.
     
  17. beenthere

    Retired Moderator

    Apr 20, 2004
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    From the proximity to the fuse and what appears to be line filters, the yellow/black pair is probably the primary. That means a single primary, so it won't convert to 220 volts.

    If you have a meter, pull the yellow/black connector, attach leads to the connector pins on the board and turn on power. If you see 120 VAC, then that is the power input to the transformer.
     
  18. evolutionX

    Thread Starter Active Member

    Aug 22, 2008
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    please note that this is the 220V version of AV receiver
     
  19. SgtWookie

    Expert

    Jul 17, 2007
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    OK, so do you have the 110V version? Can you post photos of the guts of it?
     
  20. evolutionX

    Thread Starter Active Member

    Aug 22, 2008
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    No, I don't have the 110V version, I am planing to buy one, and that's why I want to know if I can convert it to 220V. In US the same model is 50-60% cheaper than here in Europe.
     
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