Piezoelectric Buzzers 42x16mm 105dB 12V With Wires
The difference between active buzzer and passive buzzer
The “source” here does not refer to the power source. It refers to the source of shock.
In other words, the active buzzer has an internal oscillation source, so it will sound as long as it is powered on.
The passive has no internal oscillation source, so if you use a DC signal, you can’t make it scream. A square wave of 2K~5K must be used to drive it.
Active buzzers are often more expensive than passive ones because of the multiple oscillating circuits in them.
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