Amplifier circuit reduces volume

Discussion in 'The Projects Forum' started by desght, Apr 12, 2015.

  1. desght

    Thread Starter New Member

    Apr 12, 2015
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    0
    So I'm not experienced with electronics, I just started a project that seemed simple but ended up getting more and mire complicated.
    Basically, I need an amplifier to increase volume.

    https://backyardbrains.com/experiments/transistorDesign#prettyPhoto/23/

    This is the circuit I was copying, and the only thing I changed was rather than use a cockroach leg (no joke), I used my phone. All I could hear even with the volume on max was the kind of static you hear connecting batteries directly to speakers. At first, I thought I was just missing something, but my boyfriend (who knows a lot more about this stuff) pointed out that the speaker they used has its own internal amp, whereas I was just using a speaker head. So I connected my portable speaker, which has its own internal system, and I did get music out of it, but it was way quieter than when I connect the speaker directly to my phone.
    Does anyone have any guesses on what's going on?
    Let me know if you need a picture of what I built, although I'm 98% sure it's the exact same as the tutorial's except for the phone and the speaker.
     
  2. desght

    Thread Starter New Member

    Apr 12, 2015
    2
    0
    ALSO: I did stop at the first half of the circuit because I didn't have a second npn resistor. Could that be the problem? I feel like it should still at least be AS LOUD as the speaker by itself.
     
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,979
    744
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