Power up six LM324 from AC mains.

Discussion in 'General Electronics Chat' started by Joey.Jerry, Apr 9, 2015.

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  1. Joey.Jerry

    Thread Starter Member

    Jun 8, 2014
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    Hello all,
    I need a help from you. So,basically I want to power up six LM324 ICs. But using batteries is not cost effective for me. So, I decided to power them up from the AC mains. My Questions are;
    1) How can I power them up from the ac mains?
    2) In total how much volts should I provide to power up them?
    3) Which sort of a circuit should I make?
    Any helps will be much appreciated. Thank you :)
     
  2. dl324

    Distinguished Member

    Mar 30, 2015
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    Hi,

    Use or make a DC power supply. Output voltage depends on the voltage you want for the OP AMPs.
     
  3. Joey.Jerry

    Thread Starter Member

    Jun 8, 2014
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    Hey, Do you have any links to a tutorial to make a DC power supply? I may need somethind around 24 V.
     
  4. Papabravo

    Expert

    Feb 24, 2006
    10,140
    1,790
    You cannot power integrated circuits from the AC mains. It is dangerous and the voltages are not compatible. You need to convert the AC from the mains to DC via a TRANSFORMER, a rectifier, and a filter capacitor. Then you need to have a voltage regulator that will reduce the voltage to a uesable range. The great news is that you can buy these devices already assembled cheap. Then you can spend your time experimenting.
     
  5. dl324

    Distinguished Member

    Mar 30, 2015
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    Follow Papabravo's advice and add a regulator to the unregulated DC. I'd suggest using an LM317 so you can create a variable power supply. You can find the LM317 datasheet on the WEB. It should have all the info you need (once you have a source of unregulated DC).
     
  6. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    It will be cheaper to buy a ready-made 24VDC supply than to build one.
     
  7. Joey.Jerry

    Thread Starter Member

    Jun 8, 2014
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    So, can you say what all components should I buy?
     
  8. crutschow

    Expert

    Mar 14, 2008
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    The easiest and cheapest is to buy a wall-wart of the desired voltage and current rating.
     
  9. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    Can you share a schematic along with complete details of what you intend to do with these LM324 chips?
    Your request so far is odd.. In that one who would know what to do with op amps would at least have basic knowledge of AC/DC power supplies,etc...
     
  10. dl324

    Distinguished Member

    Mar 30, 2015
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    Just be aware that some DC wall warts are unregulated DC.
     
  11. ScottWang

    Moderator

    Aug 23, 2012
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    The owners of All About Circuits has elected not to host discussions of transformerless threads.

    This thread is against the AAC forum rules, Terms of Service (ToS).

    Any kind of over-unity devices and systems
    Automotive modifications
    Devices designed to electrocute or shock another person
    LEDs to mains
    Phone jammers
    Rail guns and high-energy projectile devices
    Transformer-less power supplies
    Terms of Service (ToS).

    Automotive modifications of any kind are strictly forbidden. Therefore, this thread will be closed.

    Please try to understand the reasons behind this action, and feel free to browse and use the forums.

    You might find answers to your questions in one of these forums:

    http://forum.allaboutcircuits.com/showthread.php?t=54400

    Another good forum that shares many of the same membership is http://www.electro-tech-online.com/ .

    Good luck.
     
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