Power amplifier help

Discussion in 'The Projects Forum' started by kahafeez, Dec 2, 2008.

  1. kahafeez

    Thread Starter Active Member

    Dec 2, 2008
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    Hi people, i need to make a power amplifier for the following application. plz suggest me a simple as possible power amplifier which works in the audio range that is from 20Hz to 20KHz bcz my application works on 40KHz and 50KHz. i just need this plz help. thanks. and with the least components plz. the power amplifier i need should have a gain of 30dB.... and also tell me that how should i calculate the power of my FSK signal as shown in the attached image
     
  2. kahafeez

    Thread Starter Active Member

    Dec 2, 2008
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  3. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Did you already consider the LM12 power op-amp?
    See datasheet for the specs.

    Greetings,
    Bertus
     
    • LM12.pdf
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  4. kahafeez

    Thread Starter Active Member

    Dec 2, 2008
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    thanks dude, i dont really want 80Watts.....


    i found this IC called LM386 which gives 1Watt. and LM380 which gives 2.5W. thanks
     
  5. bertus

    Administrator

    Apr 5, 2008
    15,638
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    Hello,

    I think the LM380 and LM 386 do not reach such high frequencies.
    The LM12 reaches 100 khz.

    Greetings,
    Bertus
     
  6. kahafeez

    Thread Starter Active Member

    Dec 2, 2008
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    ya dude, bt i asked for an audio amp.... that is 20Hz to 20KHz .... this suits me well ;)
     
  7. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The circuit drives an antenna. It must be an extremely long antenna for such a low frequency.

    The LM386 little power amp has a response that is -3dB at 300kHz when its gain is 20 (26dB).
     
  8. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    6,200 feet will give him a 1/4 wavelength antenna for 45kHz.

    Yep, that's a rather long antenna.
     
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