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Why are large portable speakers more popular?

Nowadays,large portable speaker are very common in the market. Not long ago, Meizu also released a small Bluetooth speaker. So why are large portable speakers so popular?

How to use tws bluetooth headset

After the tws bluetooth headset is paired, the mobile phone needs to search for bluetooth devices. Generally, it takes about 5 seconds tosearch for the tws bluetooth headset.Most cell phone passwords are 0000 or 1234, but some are specially set by the manufacturer, which will be detailed in your tws bluetooth headset manual.

Advantages of live broadcast

The information dimension of live broadcasting ismore abundant, which enables consumers to have a more intuitive and comprehensive understanding of product content and service information.The biggest advantage of live streaming is that it allows consumers to immerse themselves in the shopping scene.

How to better choose and use dancing speaker

For music lovers, they have a set of their favorite sound system, and one of the important components-speakers, play a decisive role in the quality of the replay sound, so when choosing dancing speakers, they will take great pains, but apart from comparing the speaker technology In addition to indicators and listening evaluation, some small knowledge about dancing speakers will also allow you to better choose and use dancing speakers.

The advantages of bluetooth wireless headphones

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How to activate the professional speaker amplifier protection function?

Here are 6 working modes to enable the professional portable speaker amplifier protection function:

1. Overcurrent protection

When the load of the portable speaker amplifier is too low but does not reach the short-circuit state, the short-circuit protection will not act at this time, but the output current will be very large and exceed the safe use value of the portable speaker amplifier. At this time, the overcurrent protection circuit will intervene in the work. The usual practice is: Control the input voltage and output current so that the power amplifier always works within a safe range.

2. Overheating protection

The well-designed amplifier will not have overheating protection under normal use. It will only act when the external use environment is bad or the internal failure occurs. The hottest part of the whole portable speaker amplifier is the C pole (collector) of the output stage transistor, so the temperature sensor for overheating protection is generally installed in the place closest to the C pole of the transistor or the hottest place on the radiator. The threshold value of overheating protection is generally 95°C, but also 105°C, and the extreme temperature of the transistor is 105°C.

3. Soft start protection value

Audio equipment with a large current draw can flow 4-10 times the average current value at the moment when the power is turned on. This is a shock to the power grid and the equipment itself, and will damage the equipment in severe cases. The soft-start circuit can suppress the inrush of current at the moment when the equipment is switched on and off, so that it can reach normal smoothly to protect the equipment and not cause grid fluctuations. This function is usually achieved with the negative temperature characteristic of the thermistor (NTC).

4. DC protection

When the portable speaker amplifier output stage is damaged or the static bias is shifted, it is possible to deliver a DC signal. For the speaker, its working method only produces impedance to the AC signal, and it does not produce any impedance (equal to zero impedance) for the DC signal. At this time, the current is infinite, so the coil of the speaker is equivalent to a DC signal. A heating wire will burn quickly. So accurate and fast DC protection circuit is very important. The DC protection start value of the portable speaker amplifier is usually set at 2V. When it is greater than or equal to this value, the portable speaker amplifier will cut off the output to protect the speaker. There are also amplifiers that will cut off the output by blowing the built-in DC fuse.

If the DC protection circuit of a portable speaker amplifier is normal, but the coil of the speaker is burned out, there are only two reasons: the power input to the speaker is too large, or the signal output by the portable speaker amplifier is clipped into a square wave.

Short circuit protection

When the output of the portable speaker amplifier is short-circuited for some reason, the current output by the portable speaker amplifier will circulate in its own circuit and become infinite. Such a situation is very dangerous, so there must be accurate and fast short circuit protection circuits to protect the best portable speaker amplifier equipment. Under normal circumstances, when a short circuit occurs in the portable speaker amplifier, first it will control the input signal to reduce its amplitude even to zero. If the situation does not improve (the current flowing through the best portable speaker amplifier still exceeds the safe value), it will suppress the output current, allowing The current flowing inside the amplifier is always lower than the safe value of the output stage transistors.

5. Distortion Compressor

The input level value of audio equipment has a specified range. If it exceeds this range, the signal will be clipped, and in severe cases, it will become a square wave. The function of the distortion limiter is to ensure that the level of the input signal is always controlled within the linear working area allowed by the audio equipment. The general standard is to start when THD1%.