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Anonymous users2024-01-24Let the working current you set according to the requirements of brightness and LED parameters is i, the voltage drop between the rectifier diode and the LED is negligible, and the power on the resistor is the voltage 220V multiplied by the current i when there is no rectifier diode, and the effective value is halved after the diode half-wave rectification.
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Anonymous users2024-01-23No need to calculate, if the LED you use is an ordinary light-emitting diode, use 1 4W, 3K resistor, if the high-brightness light-emitting diode has my resistance.
LED night light drive circuit, directly modify the regulator tube Z1, the original, change to 7V, you can go.
Use three transistors to make an oscillation circuit, and the principle is the same.
Go to the electronics enthusiast forum, I'm afraid you won't be able to achieve it here!
Beds, wardrobes, cabinets, sofas, coffee tables, dining tables, chairs, TV cabinets.