philip MX40 Patient Monitor parts Wearable Loud Speaker Repairs Replacement

philip MX40 Patient Wearable Monitor Loud Speaker

There are many types of speakers, and the prices vary greatly. Speakers can be divided into electric, electromagnetic, piezoelectric, etc. according to their structure. Among them, electric speakers are widely used in various audio appliances due to their advantages of good electro-acoustic characteristics, firm structure, and low cost.

Speakers are divided into woofers, midrange speakers, and tweeters according to their operating frequency.

The working principle of the loudspeaker: First, an alternating current is passed into the voice coil of the loudspeaker, and the voice coil generates an alternating magnetic field under the action of the input current, and the voice coil is placed in a permanent magnet. Make a movement perpendicular to the direction of the voice coil current, so that the voice coil reciprocates under the action of the current.

Because the voice coil and the paper cone are connected together, the movement of the voice coil drives the front and rear vibrations of the paper cone, and the vibration of the paper cone pushes the vibration of the air, and the human ear can feel the vibration of the air and produce sound. In this way, the current input to the speaker is converted into sound by the action of the speaker.

When the AC current input into the speaker is larger, the AC current flowing through the voice coil is also larger, the magnetic field is stronger, the vibration amplitude of the paper cone of the speaker is larger, and the corresponding sound is louder. On the contrary, when the AC current input into the speaker The smaller it is, the quieter the sound from the speakers.

Frequency Characteristics of Loudspeakers

First of all, when a DC current is input to the speaker, the paper cone of the speaker will also produce a displacement, but the paper cone does not vibrate, and the air will not vibrate at this time, so the speaker has no sound. From this, it can be known that the speaker cannot convert the DC current into sound.

When the frequency of the AC current input to the speaker is different, the vibration frequency of the speaker cone is different, and the vibration frequency of the speaker cone is the same as the AC frequency input to the speaker.

The higher the frequency of the input current, the higher the frequency of the sound from the speaker, and the lower the frequency of the input current, the lower the frequency of the sound from the speaker.

Theory and practice prove that the same speaker can't do both treble and bass well, so there are woofers, tweeters, and midrange speakers.

Make the paper cone of the woofer larger and the outer edge softer, so that the woofer only works in the low frequency range. Then according to the working characteristics of the tweeter, the tweeter is made so that the tweeter only works in the high-frequency range, so that the high-frequency and low-frequency characteristics of the speaker can be well taken into account.

When using more than one speaker, it is necessary to distinguish the polarity of the speaker pins, because when two speakers are connected in series or in parallel with different polarities, the direction of current flowing through the voice coils of the two speakers is different, one is from the head of the voice coil The other is inflow from the tail of the voice coil, so that when the paper cone of one speaker vibrates backward, the vibration phase of the two speaker cones is opposite, so that part of the energy of the air vibration is cancelled.

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