Note that in this case, the "source" is not the power supply.It is the volatile source.
The characteristics of the passive buzzer is: 1 passive internal without shock source, so if use dc signal can't make it.Must use 2 k ~ 5 k square wave to drive it For more than 2 sound frequency control, can make "m hair sola west" effect. 3 in some particular case, can reuse and LED a control
The characteristics of the active buzzer is: 1 Active buzzer inside with shock source, so as long as the electricity will call 2 Program control convenient, single chip microcomputer a high and low level can make the sound, and the passive buzzer is can't do. Each weight is about 6 g
1 module driven by 9012 triode 2 working voltage of 3.3 V to 5 V 3 sets of fixed bolt hole, convenient installation 4 small board PCB size: 3.3 cm X 1.3 cm
2 Module interface specification (3 wire system) 1 VCC external 3.3 V to 5 V voltage (which can be directly connected to 5 V microcontroller and 3.3 V microcontroller) 2 GND external GND 3 I/O external microcontroller IO port