Novel Buzzer

This novel buzzer circuit uses a relay in series with a small audio transformer and speaker. When the switch is pressed, the relay will operate via the transformer primary and closed relay contact. As soon as the relay operates the normally closed contact will open, removing power from the relay, the contacts close and the sequence repeats, all very fast that the pulse of current causes fluctuations in the transformer primary, and hence secondary.
Novel Buzzer - schematic

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