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Anonymous users2024-01-23The resistor-capacitance step-down circuit in the figure is more dangerous because there is no isolation, it is generally suitable for low-power wicks or charging batteries, the size of the device on the circuit board in the figure is difficult to see the load 3W, it is recommended to consider the mobile phone charger plus LED driver plus LED scheme.
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Anonymous users2024-01-22These are two lights, which look like LED lamps with resistance and voltage reduction, if you want to change to low-voltage power supply, the circuit needs to be changed to a large extent, which will be more troublesome, and I personally think it is not worth changing.
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Anonymous users2024-01-21You should be an LED light, the most convenient thing is to buy a small transformer, add rectifier, and connect the lamp beads in parallel.
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Anonymous users2024-01-20I'm not I forgot good wow good wow,
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Anonymous users2024-01-19I suggest you go and study physics, even though I hate it.
What question does the landlord want to ask? I didn't understand it. I also make light-controlled night lights.
Since it is light control, the lights will be turned off naturally during the day, and there is no need to turn them off manually.
There are light control lights on Taobao, and you can see them for 2 yuan, just 4 components, LED, 50K large resistance, light sensitive, and transistor.
The triode 1 and the triode 2 are both NPN type transistors (such as 8050), and the power of the triode 2 is greater than that of the triode 1, and they form a Darlington tube to drive the LED >>>More
Only one kilowatt-hour of electricity is used a year, no light self-lighting LED light control night light, flame retardant color plastic power, batch (unit)...About 15 yuan (the market price of a warranty of one year or more), as long as you use it for 3 months, you can save back the money you bought for energy-saving lamps.