PicoMite: driving a passive buzzer

Author	Message
thwill Guru Joined: 16/09/2019 Location: United Kingdom Posts: 4252	Posted: 05:14pm 28 Nov 2022         Mixtel90 said   If it's an active buzzer it's got a fixed frequency. It's either on or off. Have a close look and see if there's a + mark on it. Stick it on 3V and see if it makes a buzz. I literally just tested it as you were writing that post. It does have a (+) but other than a brief crackle when you make the initial connection it doesn't do anything with 3.3V attached to it. Plus I drove it using PWM directly from a Pico pin earlier in the day and lived to tell the tale. I guess I'm going to proceed on the basis it is passive and later this evening try driving it though a 2.2K resistor to the base of a 2N3904. EDIT: and they are also slightly magnetic so I guess that means they are likely to be miniature speakers. Best wishes, Tom Edited 2022-11-29 03:26 by thwill