single transistor speaker amplifier

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Research Survey

Joined Feb 27, 2016
14
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.
 
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