Why use diodes instead of bulbs for indicator lights

There are many kinds of indicators, not all indicators are LED, in the low-voltage DC voltage indication circuit, most of them are LED, its advantage is that the power is small, almost all voltages commonly used after the series resistance (except below), the resistance power value is very stable at 1 4W, and the resistance resistance value in series only needs to change the resistance value of the series in order to adapt to different voltages, and the bulb in order to adapt to different voltages, the products made also need a variety of voltage values, and its power is generally large, If it is used in a circuit that is higher than its own withstand voltage, if it also uses the method of series resistance, the power required by the series resistance is often greater than 2W, and the heat is serious, and there are still many circuits in the AC voltage indication circuit that use bulbs, and their rated voltage values are generally the voltage values that need to be indicated, and there is no need for any external circuit, and there are some AC circuits with neon bubbles to indicate.

The on-voltage of the light-emitting diode is about 2V, the current is a few milliamperes to more than ten milliamperes, the power consumption is low, the life is long, the main power consumption of the bulb is large, and the life is short, so the light-emitting diode is now widely used. It's mine.

The diode has low power consumption and good heat dissipation. Small size and easy maintenance. The on-voltage is small.

The microcontroller is easy to drive (within the range of the microcontroller's driving capacity).

Easy to integrate. Colors are available. Cheap.

There are several reasons for this:

1》The bulb is a thermal light source, with high energy consumption, large volume, and small cold resistance, which has a large impact on the circuit.

2》LED is a cold light source, high luminous efficiency, small size, easy to install.

3》LED is rich in color.

You mean that in the AC circuit, if it is a light-emitting diode 4007 or 5408, the function is to reverse the cut-off, because the response voltage of the light-emitting tube is small, it will damage the light-emitting tube, if it is a lamp, it is to reduce the voltage, without using electricity.

The second tube has a long life, small size, energy saving and fast response speed.

You can check out the difference between the two luminescence principles, and you will know why.

Summary. Hello dear, happy to answer your <>

To get the diode bulb to light up normally, you can follow these steps:1Confirm the power supply:

Make sure that the power supply of the diode bulb meets the operating requirements, and that it should generally operate within the specified voltage and current range. 2.Check the wiring:

Check that the wiring between the bulb and the distribution box or other power source is correct and that all wiring is secure and reliable. If there is a faulty or damaged wiring, it should be replaced immediately. 3.

Replace the bulb: If the bulb won't light up, you can try replacing it with a new bulb and test it again. 4.

Restart the circuit: Some bulbs may need to be powered off and restarted before they can light up. 5.

Clean the surface of the lamp: With the condition of confirming that the wiring is connected properly and cutting off the power supply, you can clean the dust and dirt on the surface of the lamp to improve the brightness and aesthetics of the bulb.

How can a diode bulb turn on.

Hello dear, happy to answer your <>

To get the diode bulb to light up normally, you can follow these steps:1Confirm the power supply:

Make sure that the power supply of the diode bulb meets the operating requirements, and that it should generally operate within the specified voltage and current range. 2.Check the wiring:

Check that the wiring between the bulb and the distribution box or other power source is correct and that all wiring is secure and reliable. If there is a faulty or damaged wiring, it should be replaced immediately. 3.

Replace the bulb: If the bulb won't light up, you can try replacing it with a new bulb and test it again. 4.

Restart the circuit: Some bulbs may need to be powered off and restarted before they can light up. 5.

Clean the surface of the lamp: After confirming that the line connection is normal and cutting off the source of the power branch, you can clean the dust and dirt on the surface of the lamp to improve the brightness and aesthetics of the bulb.

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Diode bulbs have advantages:1Energy saving and environmental protection:

Compared to traditional incandescent lamps, diode bulbs consume less power, last longer, and are free of harmful elements such as mercury. Therefore, the use of diode bulbs can achieve the purpose of energy saving and environmental protection. 2.

Long life: Diode bulbs have a long lifespan, typically reaching 20,000 hours or more. This means you can replace fewer bulbs, reducing repair and replacement costs.

3.Good color rendering: Diode bulbs have a high color rendering index (CR>80), so they provide a more natural lighting effect and can more realistically reflect the color and contours of objects.

4.Easy to install: Diode bulbs are typically lightweight and simple to install.

Most diode bulbs are designed with a normal thread, so they can be plugged directly into a traditional lamp holder. 5.Cooler temperatures:

Diode bulbs work with much less heat than traditional bulbs and do not heat indoor air like incandescent bulbs, resulting in a more comfortable environment. Diode bulbs have become an advanced energy-saving lighting technology, with the advantages of low power consumption, long life, and good color rendering. They are also becoming more and more popular and are widely used in domestic, commercial and industrial applications.

Summary. Hello dear, I'm glad to answer for you. Diode bulbs need to be plugged into power and a circuit is created between the positive and negative poles in order to emit light.

Typically, a direct current (DC) power supply is used and the positive electrode is connected to the positive pole of the diode and the negative electrode is connected to the negative pole of the diode so that the diode emits light. It is important to note that the diode is unidirectional, so the direction of connection is also very important. If the connection is reversed, the diode will not emit light.

Hello how to do this.

Hello dear, I'm glad to answer for you. Diode bulbs need to be plugged into power and a circuit is created between the positive and negative poles in order to emit light. Normally, a wide sling requires the use of a direct current (DC) power supply and the positive electrode connected to the positive pole of the diode, and the negative electrode to the negative pole of the diode, so that the diode emits light.

It is important to note that the diode is unidirectional, so the direction of connection is also very important. If the connection is reversed, the diode will not emit light if it is carefully combined.

Hello dear, I'm glad to answer for you. Diode bulbs need to be plugged into power and a circuit is created between the positive and negative poles in order to emit light. Normally, a wide sling requires the use of a direct current (DC) power supply and the positive electrode connected to the positive pole of the diode, and the negative electrode to the negative pole of the diode, so that the diode emits light.

It is important to note that the diode is unidirectional, so the direction of connection is also very important. If the connection is reversed, the diode will not emit light if it is carefully combined.

1. AC power supply, diode must not be connected in parallel with the bulb!! , because to connect in parallel with the bulb is to connect in parallel with the power supply, it is a short circuit!!

2. AC power supply, the diode is connected in series with the bulb, the bulb must be bright, but the brightness is dimmed, because the diode conducts electricity unidirectionally. Unless the diode is bad: if it is not bright, it is an open bad tube, and if it is not dim, it is a short circuit bad.

3. DC power supply, the diode is connected in series with the bulb, which may or may not be on, depending on the direction of the diode (or the direction of the power supply), because the diode conducts electricity unidirectionally. Unless the diode is bad: if it is on in both directions, it is a short circuit, and if it is not in both directions, it is an open circuit.

or the supply voltage is less than 2V

4. DC power supply, the diode is connected in parallel with the bulb, that is, it is connected in parallel with the power supply, and the diode can only be "reversed" with the power supply: the negative pole of the diode is connected to the positive pole of the power supply, and the diode is connected to the negative pole of the power supply. The withstand voltage of the diode must be higher than that of the power supply.

5. DC power supply, the diode is connected in parallel with the bulb, that is, it is connected in parallel with the power supply, and the diode must not be "at the same pole" with the power supply, and "at the same pole" is a short circuit.

In such a circuit, only the half-cycle on-light will be on, and the other half-cycle will not be on, and the light will not be on;

If you have to have a diode, then connect a diode in reverse parallel, so that the diode is turned on throughout the cycle, and the light will be brighter;

It's just, I don't know why you're connecting diodes in series?? (It's that prolongs the life of the bulb).

The diode is unidirectionally conductive, only half of the alternating current passes through, and the natural brightness will decrease, if you want not to drop, the brightness is the same as before, you have to remove the diode. Don't bother yourself.