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Ground. In this case it's the negative of the battery, where pin 1 is connected, but this isn't always the case for all circuits. See the link below.https://www.physicsforums.com/threads/what-does-0-v-exactly-mean-in-an-electric-circuit-mean.803356/
Quote from: Zero999 on May 15, 2019, 06:34:31 pmGround. In this case it's the negative of the battery, where pin 1 is connected, but this isn't always the case for all circuits. See the link below.https://www.physicsforums.com/threads/what-does-0-v-exactly-mean-in-an-electric-circuit-mean.803356/Thanks. So I would connect pin 3 to the positive lead of buzzer and the negative lead of buzzer would go to ground or negative lead of my power source?