The difference between magnetic buzzer and magnetic transducer (Part 3)

  The electromagnetic buzzer is composed of an oscillator, an electromagnetic coil, a magnet, a vibrating diaphragm and a shell. After the power is turned on, the audio signal current generated by the oscillator passes through the electromagnetic coil, causing the electromagnetic coil to generate a magnetic field. The vibrating diaphragm periodically vibrates and produces sound under the interaction of the electromagnetic coil and the magnet. The electromagnetic transducer has the same working principle as the electromagnetic buzzer, but one less oscillating circuit.

  The left side of the picture above is the structure diagram of the electromagnetic buzzer, and the right side is the structure diagram of the electromagnetic transducer, almost exactly the same. The only difference is whether it contains an oscillating circuit. So one of the ways to distinguish them is to see if they can be driven by DC voltage.

From the perspective of parameters to distinguish between electromagnetic buzzer and transducer:

1. Distinguish from whether the operating voltage is DC or AC. As mentioned above, the DC voltage is an electromagnetic buzzer, and vice versa is a transducer.

2. Normally, the coil resistance will not be marked in the parameter table of the electromagnetic buzzer, but the transducer will be marked.

So from these two points, you can simply distinguish that the product in your hand is an electromagnetic buzzer or a transducer.