The most complete LED energy-saving lamp production in history

LED energy-saving lamps are powered by a typical AC capacitor step-down constant current circuit. Although the power factor of the 24 LED energy-saving lamp kits here is only about 3.3, they are very suitable for electronic enthusiasts or schools to carry out labor skills, interest groups, electronic skills training and other activities. They can not only exercise and improve hands-on ability, but also strengthen the ability to solve practical problems. At the same time, you can also get a very practical LED energy-saving lamp. Teachers can download and print them and give them to each student for reference when making them.

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Product 1: Self-made 24LED AC white energy-saving lamp, finished product 23 yuan each, actual power consumption 2.4W

Product 2: Self-made 24LED AC white energy-saving lamp complete set of parts 12 yuan a set of list is as follows:

1. 25 diffuse white high brightness LEDs

2. One piece of plastic shell, one piece of screw-on lamp holder, and one piece of light-distributing plate

3. One 400V/0.33UF step-down capacitor

4. One 100V/4.7UF filter capacitor

5. One integrated rectifier bridge

6. One 1M high voltage discharge resistor

7. One 100 ohm current limiting protection resistor

8. One piece of power board PCB

9. One piece of LED light board PCB

This is the circuit diagram of the recently revised 24 white LED AC energy-saving lamp. We connect all 24 LEDs in series, so that the power consumption of the lamp can be reduced to about 2.4W, which is more energy-efficient. The entire circuit is divided into two parts: the power board and the LED lamp board, which greatly reduces the difficulty of production.

First, you can solder the LED light board. Before making it, carefully rub all the pads of the LED with a drawing eraser. This can remove the oxide layer on the PCB and ensure reliable soldering! Insert the white LED into the PCB carefully according to the polarity marked on the PCB. Note: The longer pin is inserted into the hole marked with "+" on the PCB. Do not insert it in reverse!

When soldering LEDs, please use a 30W pointed soldering iron that does not leak electricity. You can solder one pin of the LED first and observe the position of the LED. If it is not correct, you can straighten it when the solder melts. After confirming the correct position, solder the other pin. Soldering should be quick and decisive, and the soldering time should not be too long, which should be controlled within 2 seconds, otherwise the LED may be damaged! We specially provide an extra LED to prevent beginners from accidentally damaging it.

You can solder the inner circle LEDs first, and then solder the outer circle LEDs. The front side of the PCB is silver-plated, which can effectively reflect light and increase brightness. After soldering, please carefully check whether there is a cold solder joint? Is there a bridge short circuit? Are the LEDs on the same plane? Are there any extra solder balls scattered on the PCB? After soldering, use soft wires to lead out from A and B on the LED light board. Next, we can solder the power board.

According to the above picture, weld the rectifier bridge and the 4.7UF/100V filter capacitor. Note: electrolytic capacitors and rectifier bridges have polarity, so be sure to weld them in the direction of our picture. (The white silk screen V+ V- on the front of the PCB is wrong, please don't be misled) After welding, weld the A and B pads of the power board to the A and B pads of the LED light board with insulated soft wires.

Lead out two soft wires from the two pads marked "AC in" on the power board, one is welded to the shell, and the other is welded to the center electrode. The welding points are shown in the red arrows in the figure above. Finally, use hot melt glue to fix the screw lamp holder, power board, LED light board and light distribution board to prevent shaking and accidental short circuit.

The finished LED lamp is not only light and not easy to break, but also has a brightness equivalent to that of a 5W energy-saving lamp and is very beautiful! Production precautions: Please check carefully and test it after power on, pay attention to personal safety, and beware of electric shock! Common faults: Because this lamp has a large number of LEDs, it is easy for all LEDs to not light up because one of them is damaged or the LED pins and PCB are poorly welded, so the key to successful production is to be careful when welding LEDs! The troubleshooting method is as follows: Use a multimeter with a DC 250V voltage range to measure the voltage across each LED (pay attention to safety when measuring, the entire circuit board and the AC mains are not isolated at this time, and there is a risk of electric shock when touching the parts on the board!) If the voltage across a certain LED is found to be abnormally large, it means that the open circuit point is nearby (such as LED installed upside down, LED core open circuit, LED pad root PCB short circuit, LED cold soldering, etc.) The most effective way is to use a DC voltage to test the LED, and completely disconnect the AC power first! Then, if you use a DC voltage of about 10V, connect 4 LEDs in series and then power on the test, you can quickly determine the fault.

The most common errors are: 1. Poor contact between LED pins and PCB 2. LED is plugged in with reverse polarity 3. LED is damaged due to long soldering time 4. Resistors or other components are connected incorrectly.

Product 3: Self-made 12LED AC automatic gradient color energy-saving lamp, finished product 14 yuan each, actual power consumption 1.3W

Product 4: Self-made 12LED AC automatic gradient color energy-saving lamp complete set of parts 11 a list is as follows:

1. 4 red, blue and green high brightness LEDs each

2. One piece of plastic shell, one piece of screw-on lamp holder, and one piece of light-distributing plate

3. One 400V/0.33UF step-down capacitor

4. One 25V/47UF filter capacitor

5. One 6.3V/1W Zener diode

6. One 730K high voltage discharge resistor

7. One 100 ohm current limiting protection resistor

8. One integrated rectifier bridge

9. One 82K (823) chip resistor

10. A control circuit board with an integrated circuit for controlling the LED (the round black plastic part)

12LED holiday color energy-saving lamp is a new type of lamp, power consumption is very low less than 3W, can automatically change the light color, red, blue and green colors constantly change, mixing with each other will produce a strange lighting effect, is a holiday decoration, birthday parties, western restaurants, coffee shops, fast food restaurants, the ideal choice for a relaxed and romantic atmosphere, and is widely used in urban lighting embellishment, riverside lighting, building outlines in environmental engineering, its ultra-low energy consumption caters to the current social environmental protection concept of energy conservation and emission reduction.

For customers who want to DIY assemble colored lights, they will definitely succeed as long as they carefully follow the production process below!

First, you need to distinguish the light-emitting tubes of different colors. The working characteristics of different colors of LEDs are different. The red LED terminal voltage is slightly bright at 1.5V, and brighter at 2V. The blue and green LED terminal voltages are slightly bright at 2.2V, and brighter at 2.5V. If you rashly use high voltage to light up the LED, it is very likely to burn out. We can use a 3V DC power supply (2 batteries) in series with a 100 ohm resistor (the blue resistor in the kit) to light up the LEDs one by one, and then separate the three colors of LEDs.

Please be sure to use a 30W pointed soldering iron with no leakage. Pay attention to the welding to be decisive and not too long, control it within 2 seconds, otherwise the LED may be damaged! Pay attention to the polarity of the LED when welding, and insert the longer pin into the hole marked with + on the PCB. Do not insert it in reverse! Welding tips: first spot-weld the pin of an LED, then melt the solder, hold the LED close to the PCB and straighten it, then weld another pin, and then cut off the extra pins. The four red LEDs must be welded to the middle of the board (we design the working current according to the red LED) and the blue and green ones are welded around in an interval manner, as shown in the figure above.

Then solder the 82K (823) chip resistor, at the red arrow position in the above picture, solder one end of the chip resistor first, then solder the other end after straightening the position. After soldering, use a digital multimeter to measure the resistance, which should be around 60K. Note that there is a lead under the chip resistor, which can be used to measure whether there is a short circuit? Now we can do a test, as shown in the above picture, the red wire is connected to a 5-6V DC voltage, and the black wire is connected to the negative pole. At this time, the LED lights should be able to work normally, which means that the DC part is normal!

Now we need to weld the AC capacitor step-down power supply part. Note that the voltage regulator diode, filter electrolytic capacitor and rectifier bridge in the above picture have polarity. Please carefully refer to the picture for welding and don't make mistakes!! Finally, connect the black lead in the above picture to 220V AC power to work. Please pay attention to personal safety when connecting the AC power supply.

Fix the screw-on lamp holder to the shell with hot melt glue. One of the two lead-out wires is welded to the shell, and the other is welded to the center electrode. The welding points are shown by red arrows in the figure above.

Product 5: 60 LED AC white energy-saving lamp, 45 yuan each, actual power consumption 4.4W

Lamp holder interface: Standard E27 threaded interface

Light color: White diffuse light

Working current: <60MA

Working voltage: 220V AC

Luminous brightness: Super bright, equivalent to the brightness of a 15W energy-saving lamp

Lighting Angle: 110～135 degrees

This is a 220V AC energy-saving lamp made of 60 high-brightness white diffuse light LEDs. It has a diameter of 76 mm and a height of 65 mm, which is much brighter than the previous 24LEDs. The brightness of 24LEDs is generally suitable for low-light occasions such as corridors and night lights. 60LEDs can be suitable for bathrooms, garages, storage rooms, corridors and other occasions.

60 LEDs are connected in parallel in three ways: R, G, and B. Each way has 20 LEDs connected in series. They are powered by a typical AC capacitor step-down constant current circuit. The key points of making a 60LED lamp are the same as those of a 24LED lamp. Be sure to check the polarity of the LED! Before welding, carefully rub all the pads of the LED with a drawing eraser to remove the oxide layer on the PCB and ensure reliable welding! The time for welding LEDs should not be too long!

The red 75V Zener diode shown in the figure above is no longer needed, but the three solder points R, G, and B need to be short-circuited and connected at the GND end in the figure, which are the negative ends of the three LEDs respectively.

According to the above figure, weld the rectifier bridge and the 4.7UF/100V filter capacitor. Do not get the polarity wrong (the white silk screen V+ V- on the front of the PCB is wrong, please do not be misled). After careful multiple checks, power on the test. Pay attention to personal safety and beware of electric shock! This circuit is a typical capacitor step-down constant current circuit, so it cannot be powered on when the load (LED light) is not connected! Otherwise, the filter capacitor and other devices will be damaged! After welding, the circuit board and wiring must be fixed with hot melt adhesive to prevent short circuit and disconnection!

Common faults: Because this lamp has a large number of LEDs, it is easy for one of the LEDs to be damaged or have poor contact with the PCB, causing all the LEDs to not light up. If there are faults in any of the three LEDs, all the LEDs will not light up, and then the voltage regulator will be overloaded and burned out due to no load. Therefore, the key to successful production is to be careful and careful when soldering the LEDs! If one LED does not light up, you can mark all the LEDs on this path, and then add DC power to test and light up a group of LEDs along the PCB routing (such as using 10V DC, 4 LEDs are connected in series and then powered on for testing. Be sure to disconnect the AC power supply during the test and pay attention to personal safety) The most common errors: 1. Poor contact between the LED pin and the PCB 2. The LED is plugged in with reverse polarity 3. The LED is damaged due to too long welding time 4. The voltage regulator is connected in reverse 5. The resistor or other components are connected incorrectly.

Product 6: The list of materials for self-made 60 LEDs is as follows: Full set of parts 29 yuan per set

1. 60 warm white high brightness diffuse light LEDs

2. One piece each of plastic shell, screw-on lamp holder, lamp board and power board

3. One 400V/0.68UF step-down capacitor

4. One 100V/4.7UF filter capacitor

5. One 600V 0.5A rectifier bridge stack

6. One 750K high voltage discharge resistor

7. One 100 ohm current limiting protection resistor

Product 6: 38 LED DC 12V spotlight white energy-saving lamp finished product 25 yuan each

This is a DC 12V energy-saving lamp made of 38 high-brightness white spotlight LEDs. It is mainly used in vehicles such as turn signal lights, anti-rear-end lights, strobe lights, etc. The advantage of this lamp is that it has high brightness. Because it is a point light source with high luminous intensity, it is very eye-catching and can be found from a long distance on the road. In addition, LED lights allow for quick switching, so they are very suitable for strobe lights, flashing lights, etc. Especially with the popularity of electric vehicles, LED lights have become the first choice and can even replace headlights. The brightness is more eye-catching than the original car's, and it is very energy-saving, only more than 2W.

Lamp socket: Standard E27 threaded interface (do not connect directly to 220V AC power supply!)

Light color: White spotlight

Working current: <20MA

Working voltage: 12V

Luminous brightness: Super bright

Lighting Angle: 25～35 degrees

Product 7: 38 LED DC 12V diffuse light white energy-saving lamp finished product 25 yuan each

This is a DC 12V energy-saving lamp made of 38 high-brightness white diffused-light LEDs. Its main application areas are solar lighting, emergency lighting, road construction warnings, and automotive lighting. Generally speaking, diffused-light types should be used for lighting. Concentrated-light LEDs have a transparent polyester lens in front to form a condensing lens, while diffused-light types do not, so the light-emitting angle is large and the light is uniform. The biggest advantage of LED lights is that they save electricity, which is very important for battery systems.

Lamp socket: Standard E27 threaded interface (do not connect directly to 220V AC power supply!)

Light color: White diffuse light

Working current: <20MA

Working voltage: 12V

Luminous brightness: Super bright

Lighting Angle: 110～135 degrees

Some notes on the effects of using white LED lights:

First of all, white LED lights are not suitable for all occasions, because the overall brightness of LED lights cannot be compared with fluorescent lights. LED lights are extremely small point lights, usually with focusing lenses, while fluorescent tubes are similar surface lights, so LED lights can only illuminate a specific area in front. If you want to obtain a large area lighting effect like a fluorescent lamp, you need a lot of LEDs, which makes the cost too high and cannot be popularized.

Secondly, the so-called white LEDs are actually blue LEDs that excite yellow phosphors and then mix into white light, so the spectrum is much narrower than natural light, which is manifested as poor color rendering. Therefore, white LEDs are not suitable for reading or writing. Our lamps are mainly used in low-illuminance lighting places such as corridors, toilets, and night lights. In order to reduce costs, the LEDs of our 24LED lamps are not strictly color-separated, so a certain color difference is allowed.

The biggest advantage of white LED lights is that they save electricity. A single 24-LED light is not enough to turn on a 2(4)A or larger ampere meter, so it is free to use. In addition, as long as it is not turned on and off frequently, the failure rate is extremely low. Now there are some specialized lighting companies in Shenzhen that replace ordinary light bulbs with LED lights for enterprises for free, and then contract the lighting electricity bills of the enterprises, thereby recovering the cost of replacing LEDs, and also obtaining good economic benefits, which is worth promoting.