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Simple Amplifier

Discussion in 'Electronics Homework Help' started by Electro132, Apr 21, 2013.

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  1. Electro132

    Electro132

    261
    3
    Feb 12, 2013
    Hi,

    I want to build an amplifier but i'm not sure how to so i need some guidance in this. I've attached what i started with. It's going to connect onto 2 different circuits: one that runs on 3 v and the other on 9 volts. They both should have the trimpot turned fully on for maximum output. Thanks
     

    Attached Files:

  2. davenn

    davenn Moderator

    13,833
    1,950
    Sep 5, 2009
    1) what are you wanting to amplify ? an audio signal? something else ?

    2) what is the source of the signal ?

    3) if an audio signal, are you expecting the amplifier to drive a speaker ?

    4) if an audio signal, do you want mono or stereo ?

    Dave
     
  3. Electro132

    Electro132

    261
    3
    Feb 12, 2013

    The source of the signal is a wave (sine,saw,) and i want the amplifier to boost this signal to the max while also passing on the new current created after the amplification to the output device. The wave will be based on 3 v.
     
  4. duke37

    duke37

    5,364
    771
    Jan 9, 2011
    The Droitwich transmitter takes a sine wave signal and gives 200kW out. Is this sufficient or is your max more than this?
     
  5. Electro132

    Electro132

    261
    3
    Feb 12, 2013

    Wow.... well i'm planning on sending it through an LED. So the max i know is 150 mA output or something on an IR LED. Can this accommodate such a voltage or will it blow up?
    I have the schematic.
     

    Attached Files:

    • IR2.jpg
      IR2.jpg
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  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,496
    2,837
    Jan 21, 2010
    OK, that "protection diode" is in the wrong place.

    Point it the other way around and place it in parallel with the LED.

    That circuit will allow a maximum input voltage of around 20 volts before anything nasty happens.

    Try connecting it to the output of an ipod or a radio or something like that first.
     
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