single transistor speaker amplifier

Discussion in 'The Projects Forum' started by Research Survey, Aug 21, 2016.

  1. Research Survey

    Thread Starter New Member

    Feb 27, 2016
    9
    0
    can you guys please help me build a simple transistor audio amp like the following

    https://bryanduxbury.com/2012/01/20/one-transistor-audio-amplifier-for-arduino-projects/

    or this

    http://www.next.gr/circuits/buzzer-interfacing-with-pic16f877a-slicker-l48286.html

    i try the following circuit but there is no output.

    my only available materials are

    bc 548b transistor
    4 ohm 0.5w speaker or d24mm Piezo Transducer
    i know i need to consult the datasheet to solve for the base collector emitter parameters but i dont know how.
    http://www.rectron.com/data_sheets/bc546-547-548.pdf

    my source is a frequency generator using 555timer ic with potentiometer varying the frequency
    pin output from ic is around 20 -25ma max

    my desired output is something like this


    hoping someone can teach me how to make one and how to compute one

    many thanks in advance.
     
  2. Colin55

    Member

    Aug 27, 2015
    191
    19
    Connect the 555 to the spkr via 10u
     
  3. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,773
    1,103
    As Colin says. A single transistor stage with a BC548B won't give you any more output volume.
     
  4. Colin55

    Member

    Aug 27, 2015
    191
    19
    As Colin says. A single transistor stage with a BC548B won't give you any more output volume.
    It will give you LESS.
     
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