electric buzzer

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talisa

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hello
i've attached the circuit diagram for an electric buzzer which i am supposed to make. i need to write a description on the working of the buzzer. but i dont understand it. could u tell me in detail how it works? please
 

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It's an extremely old (40+ years?), extremely crude, blocking oscillator - the transformer is used to give phase inversion for the positive feedback. The horrible way the circuit is drawn also confuses the issue!.
 
I still have a few very old AC127 germanium transistors and some BY127 rectifiers (green ones?). The rectifier is rated for only 1250V!
 
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