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Anonymous users2024-01-24Hello, 1, lithium battery-powered bedside small speaker belongs to the active speaker, with its own power amplifier chip inside, the price is not less than 30 yuan.
2. There is only a speaker inside the passive speaker, there is no power amplifier circuit, and it relies on other audio playback equipment to drive the speaker to pronounce, but this kind of small speaker does not need lithium battery power supply or USB interface power supply, usually only 8 yuan can buy a pair of this passive bedside small speaker, hehe.
Please take a look at the example,Bedside small speaker physical dismantling diagram:
In the picture above, there are two 16-pin SMD power amplifier blocks near the [SPKR] logo, which form a BTL power amplifier circuit to drive the sound of the two speakers respectively.
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Anonymous users2024-01-23Yes, I just used one, only one speaker, and one for the radio. 3W.
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Anonymous users2024-01-22With the power amplifier, the battery is used to power the power amplifier.
Lithium batteries may only have safety problems when charging, and they must be overcharged, if the lithium battery with a protection board is relatively safe, there will generally be no problem.
It won't damage the battery, what you're bumping into is just the protective case of the battery.
Generally speaking, alternating current is used, and water inlet and cleaning must rely on electricity. If you use a battery, you can clean it slowly if the battery runs out.
There are a lot of treasures, but most of them are for personal use, the power is small, not durable, IKEA MUJI has a small desktop type, practical and beautiful, slightly expensive, and can be purchased according to the situation.
The switch is good, the light is good, (it won't be an energy-saving lamp, only a bulb) is no problem, but there is no power. >>>More