SMT-12

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Alarms, Buzzers, and Sirens

Sensitron Magnetic Transducer, or SMT-12, is an electronic device that transforms electrical signals into audible sound signals and are commonly used in alarms, bells, buzzers, and sirens. As the name implies, an SMT-12 device is capable of producing a magnetic field around an electromagnet or a permanent magnet to oscillate at an audible frequency. This oscillation can then be detected by sensors placed in close proximity to the SMT-12 device.

Application Field

The SMT-12 application field varies due to its versatility in terms of electronic devices it can control. It is mostly used in combination with alarms, buzzers, and sirens as a part of the security and safety systems to warn, report or generate an emergency signal. Most major applications include for military, automotive, railway, and aviation uses, and for use in industrial, fire, medical and environmental alarms.

The SMT-12 can also be used as a part of horn systems like air horns, boat horns, car horns and door bells. As they don’t require an electric circuit to operate, they can also be used for recreational purposes like DIY activities and science experiments. Additionally, the SMT-12 can be used as an actuating device in music instruments and toys.

Working Principle

The working principle of the SMT-12 is based on the magnetoelectric conversion. An electromagnet is placed inside the device which is driven by a voltage or current. This magnetic field flux is proportional to the current passing through the electromagnet wires. In its basic form, the device comprises of a coil, a ferromagnetic core and an electret condenser, as shown below.

When the current is switched on, the current in the magnet suspension winding generates a magnetic field which is converted into an electrical field by the mechanoelectrical transducer (MET). As a result, an electrical potential is applied to the electret condenser. The electrical potential causes the condenser to vibrate at a frequency in range of 18kHz - 21kHz. This vibration of the condenser is then amplified and converted into an audible sound by a speaker.

The level of the sound produced by the SMT-12 can be controlled by adjusting the power of the current passing through the coil. By controlling the intensity of the magnetic field, the strength of the vibration can be adjusted and thus produces sound with different levels of loudness.

Apart from the current, the frequency of the sound and its radiation pattern can be controlled by adjusting the magnet mounting shape, size, and material composition. By varying the above parameters, different characteristics in the sound waves can be produced such as reducing noises from the neighbouring environment and broadening sound frequency in order to reach a wider range.

Conclusion

The SMT-12 is an extremely reliable and cost-effective device which can be used in numerous applications in order to generate audible signals. Its versatility in terms of sound production and its easy usage makes it the perfect choice for use in generating an alarm signal, triggering a warning system, or even as a part of appliances like door chimes and car horns.

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