** Simple Audio Amplifier **

Discussion in 'The Projects Forum' started by Bill Lane, Jun 18, 2009.

  1. Bill Lane

    Thread Starter New Member

    Jun 18, 2009
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    Hi All:

    I need to fine a way to bring up the volume at my outdoor speaker.

    See diagram below.

    I thought maybe a simple amplifier would do the trick, but I can't seem to find one on line.

    Your input will be very much appreciated, and thanks ahead of time.

    Amplifier not Amplifire :-(
     
    Last edited: Jun 19, 2009
  2. Wendy

    Moderator

    Mar 24, 2008
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    We have a local album at this site that is much friendlier to use, I think. The link you gave they want to sell prints. Better yet, cut and paste the link, and it will be displayed as part of your post.
     
  3. Bill Lane

    Thread Starter New Member

    Jun 18, 2009
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    Thanks Bill Marsden;

    I didn't know that I could paste a picture here.
     
  4. Audioguru

    New Member

    Dec 20, 2007
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    You need a 70W to 100W amplifier with two inputs, each input having its own volume control.
     
  5. Wendy

    Moderator

    Mar 24, 2008
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    Why so much wattage?
     
  6. Bill Lane

    Thread Starter New Member

    Jun 18, 2009
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    Hi Audioguru:

    I'm also wondering why so much wattage, but why two inputs?

    I like the idea of having a volume control.

    Where can I find an amp like this on-line in the U.S.A. ?
     
  7. Wendy

    Moderator

    Mar 24, 2008
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    Actually they used to be kind common. What kind of specs are you looking for? Start with the speakers, do you already have some, or are you shopping for them too?
     
  8. Bill Lane

    Thread Starter New Member

    Jun 18, 2009
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    I have this Pre-Amp, I haven't tried it as I don't want to create a problem.

    Just wondering if it would work.

    Hi Bill Marsden:

    I already have the system up and running like my diagram shows, but the volume is too low when I switch to the scanner.
     
    Last edited: Jun 19, 2009
  9. Wendy

    Moderator

    Mar 24, 2008
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    If I understand what you're after (and I don't claim any special expertise) you want to drive speakers for your patio. AudioGuru assumed stereo, which is also what I would assume. If not you need to tell us, it makes a difference.

    So instead of working from the front back go the other way. Pick some outdoor speakers, figure where you will put them, then figure out how loud you want them. The requirements to overpower the boombox next door aren't the same as a low level clear sound ambience.
     
  10. Bill Lane

    Thread Starter New Member

    Jun 18, 2009
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    Hi Again Bill Marsden:

    Like I said, my system is already up and running. Like my diagram shows, it's all MONO, no stereo. Take another look at my diagram above.

    It's working just the way I want it except I need to increase the volume when the scanner is selected.

    I put an amplifier in the diagram, but I really don't have one installed yet, that's why I'm here asking what I can do to increase the volume in the scanner circuit.
     
  11. hwy101

    Active Member

    May 23, 2009
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    28
    I think all you need is a 5 watt audio amp that closely matches the output of the CB radio, this should give you plenty of volume.
    http://www.canakit.com/audio-amplifiers
    I have ordered kits from them, but you can get them assembled as well.
     
  12. Wendy

    Moderator

    Mar 24, 2008
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    OK, I had to reread it, the picture was not readable on the other computer.

    Lots of posiblilities, a lot of them yard sales, eBay, flea markets, etc. A guitar amp or a PA amp, for example.

    Radio Shack used to sell little amps that would have been good for your application (though it was stereo). I don't think you want to build one from the ground up, though it is possible.

    I'll look around some online catalogs.

    You can do it too, check this thread out.

    http://forum.allaboutcircuits.com/showthread.php?t=22967
     
  13. Bill Lane

    Thread Starter New Member

    Jun 18, 2009
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    Thanks hwy101:

    I ordered the UK153, it's assembled.

    When I receive it and get it installed, I'll let you know how it works.

    Thank you also Bill Marsden, I really appreciate all the help !!
     
  14. mango matto

    Member

    Jun 2, 2009
    13
    0
    install a volume control inside then you can turn the main volume up higher. If your main volume is up loud enough for the outside your indoor volume can be turned down. I hope I am making sense.
     
  15. Audioguru

    New Member

    Dec 20, 2007
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    The CK153 amplifier provides 5 Whats to a 4 ohm speaker at a horrible-sounding 10% clipped distortion when it has a 12V supply. Its power to an 8 ohm speaker at clipping is about 1.5 Watts. Like a cheap clock radio.
     
  16. Bill Lane

    Thread Starter New Member

    Jun 18, 2009
    7
    0
    Hi All:

    I just wanted to say thanks for the help.

    I installed the amplifier and it works just fine except I get a hum if I turn the volume up over 3/4 of the way.

    The speaker in the yard is as loud as I was hoping for, so I'm happy. And the hum is no problem because I only need the volume turned up 1/2 way.

    See pictures ...

    Again, thanks for all your help!
     
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