Advertisements
Aquatic Avenue Banner Tropica Shop Banner Fishy Business Banner
Results 1 to 9 of 9

Thread: which AC adaptor okay?

  1. #1
    Join Date
    Feb 2005
    Location
    Punggol/SINGAPORE
    Posts
    713
    Feedback Score
    0
    Images
    10
    Country
    Singapore

    Question which AC adaptor okay?

    Advertisements
    Fresh n Marine aQuarium Banner

    Advertise here

    Advertise here
    Consider to DIY PC fan and which of the following adaptor can be used? (as photo). Normally, for 1 PC fan, how many mA per unit? Any advice will be appreciated. Thank you.
    The More You Share, The More You Have

  2. #2
    Join Date
    Apr 2004
    Location
    Ang Mo Kio
    Posts
    4,544
    Feedback Score
    6 (100%)
    Images
    81
    Country
    Singapore
    I'm using 12V DC, 350mA rating for my DIY fans. The adaptor powers two standard sized computer fans, so I think the one on the left in your picture should do it.

  3. #3
    Join Date
    Feb 2005
    Location
    Punggol/SINGAPORE
    Posts
    713
    Feedback Score
    0
    Images
    10
    Country
    Singapore
    Quote Originally Posted by |squee|
    I'm using 12V DC, 350mA rating for my DIY fans. The adaptor powers two standard sized computer fans, so I think the one on the left in your picture should do it.
    The one on the left has got only 200mA, enough for 2 PC fan? (if 1 PC fan needs 140mA). Any 9V PC fan in the market? If so can use the one on the right.
    The More You Share, The More You Have

  4. #4
    Join Date
    Mar 2005
    Posts
    2
    Feedback Score
    0
    Country
    Singapore
    PC fans are usually 12 VDC or 5 VDC. The one on the right is 9V AC output, can't use for most fans.

    For 12 V fans, you have a wide range to choose from: I've seen 0.03A to 0.3A; The higher the current rating, generally more powerful BUT more power consumed, and noiser because of higher fan rpm. Do try to get one with fluid bearings to reduce the whirring sound.

    Hope this helps

  5. #5
    Join Date
    Dec 2001
    Location
    Singapore, Singapore, Singapore
    Posts
    8,958
    Feedback Score
    1 (100%)
    Images
    104
    Country
    Singapore
    1. Make sure the voltage matches. Do NOT add the voltages together. I.e. if all you fans are using 12V, then make sure the adaptor outputs 12V.

    2. Add the fan ampheres together and make sure the adaptor output exceeds the required input by 30%. This will ensure the life of the adaptor and prevent overheating. From asking around, I'm told that the power usage will only be what the fans pull, not what the adaptor is rated at.
    Vincent - AQ is for everyone, but not for 'u' and 'mi'.
    Why use punctuation? See what a difference it makes:
    A woman, without her man, is nothing.
    A woman: without her, man is nothing.

  6. #6
    Join Date
    Dec 2001
    Location
    singapore
    Posts
    3,040
    Feedback Score
    0
    Images
    5
    Country
    Malaysia
    normally, pc fans are 12v. you can still run it using 9v but it will be slower.
    for current, vinz's advice is correct.
    thomas liew

  7. #7
    Join Date
    Feb 2005
    Location
    Punggol/SINGAPORE
    Posts
    713
    Feedback Score
    0
    Images
    10
    Country
    Singapore
    Quote Originally Posted by tawauboy
    normally, pc fans are 12v. you can still run it using 9v but it will be slower.
    for current, vinz's advice is correct.
    Thanks for a good advice both Vinz and tawauboy..

    The reason I asked because I've quite a few 9V AC/DC adaptor at home, and won't want to spend extra money. Based on your advice, I guess if 9V AC/DC adaptor for PC fan 12V is okay. The result is fan speed a littel slower but it's perfectly alright. As long as the PC fan will not 'die' prematurely, I mean give a lot of problem later.

    Thanks a lot
    The More You Share, The More You Have

  8. #8
    Join Date
    Dec 2001
    Location
    Singapore, Singapore, Singapore
    Posts
    8,958
    Feedback Score
    1 (100%)
    Images
    104
    Country
    Singapore
    In my experience, it's not the fans that die prematurely... it's the adaptors, especially if you run them 24/7. They literally die on you. I.e. their power drop so much they can't even start the fans. To prevent that always make sure you exceed the expected ampherage required by 30% or more.

    Tawauboy, if a 12V fan is powered by a 9V adaptor, will the amphere of the fan remain the same?
    Vincent - AQ is for everyone, but not for 'u' and 'mi'.
    Why use punctuation? See what a difference it makes:
    A woman, without her man, is nothing.
    A woman: without her, man is nothing.

  9. #9
    Join Date
    Dec 2001
    Location
    singapore
    Posts
    3,040
    Feedback Score
    0
    Images
    5
    Country
    Malaysia
    vinz, let me check it out first.

    when voltage is reduced to 9v, the current drops too.
    based on a 12v 120ma fan, the current at 12v is 80ma and at 9v it's 60ma.
    Last edited by tawauboy; 17th May 2005 at 13:24.
    thomas liew

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •