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Channel support, those wishing to thank: Privat 5169 3600 0370 7407 PayPal [email protected] ADD A CALLER: Connect the buzzer in series with the diode in parallel to the resistor of the green LED on the diagram. Naturally, observing the polarity. Checked - it works. I used the buzzer with a built-in generator, such as kls3-mwc-12. Any diode. LINK TO THE SCHEME https://drive.google.com/drive/folder... LINKS TO COMPONENTS Digital voltmeter https://arduino.ua/prod5670-cifrovoi-... Key switch https://www.rcscomponents.kiev.ua/pro... Red crocodile clip https://www.rcscomponents.kiev.ua/pro... Black crocodile clip https://www.rcscomponents.kiev.ua/pro... Case https://www.rcscomponents.kiev.ua/pro... Cable https://arduino.ua/prod4481-kabel-sou... Resistor 62 Ohm 5% 5W pin https://www.rcscomponents.kiev.ua/pro...