Howzit guys,

I need some help. I have a good understanding for electrician. I know what caps, transistors, resistors all do, but not sure how they all work together in a circuit. I have this circuits and all the components, but I need to understand how it works and why it works so that I can explain it to my cousin. I'm helping him with a school project. It's a simple buzzer circuit and I wanna be able to explain to him how it works. I basically want to understand what all the components do in order to obtain the buzzing sound.

Any help will be greatly appreciated
Thanks guys

http://www.eleccircuit.com/how-to-ma...tronic-buzzer/

 

A simple amplifier using a NPN and PNP transitor circuit with positive feedback causing the oscillations.
It is the Electronic version of acoustic feedback of a mic and amplifier in a enclosed space such as a hall where the spkr to mic feedback causes a loud high frequency sound in the spkr = positive feedback.
The .047uf and 120 ohm resistor is the feedback path.
Also just look up NPN and PNP transistor technology and function.
Max.

 

Here is an even simpler circuit: