Price: 14.95 - 7.33


CAI-221 is a LED Dimming Table Lamp DIY Kit. Its design inspiration comes from the desk lamp commonly used in home/office. It uses 24 pure white LED and adjusts the brightness of the lamp through a potentiometer.It is ideal for personal desktop lighting.

It is a very interesting DIY electronic product which enables users to understand the circuit more clearly and learn soldering skills.


1>.PWM Adjustable Brightness.

2>.Pure White LED.

3>.Flexible Lamppost.

4>.USB 5V work circuit.

5>.DIY Hand Soldering.


1>.Item name: CAI-221 LED Dimming Table Lamp DIY Kit


3>.Work voltage:DC 3.7V-5V

4>.Work current:1.7A

5>.Work power:8.5W

6>.LED color temperature:6000-8000K


8>.Brightness Adjustable: 0%-100% PWM

9>.Turn ON/OFF Lamp: Yes

10>.Housing material:Metal+ABS

11>.Work Temperature:-20℃~85℃

12>.Work Humidity:5%~95%RH



1>.Practical at home

2>.Indoor display

3>.Simple appearance, easy office

4>.Wall decoration

5>.Training welding skills

6>.Student school

7>.DIY production

8>.Project Design

9>.Electronic competition

5.Installation Steps(Please be patient install!!!):

1>.Step 1: Install2pcs DO-35 IN4148 Diode at . Pay attention to the installation direction. There is a black mark on 1N4148 and a white mark on PCB which are used to confirm the installation direction.

2>.Step 2: Install2pcs 200ohm Metal Film Resistor at R1,R2.

3>.Step 3: Install2pcs 10Kohm Metal Film Resistor at R3,R4.

4>.Step 4: Install 1pcs 0.001uF 102 Ceramic Capacitor at C5.

5>.Step5: Install 3pcs 0.1uF 104 Ceramic Capacitor at C1,C3,C4.

6>.Step 6: Install 1pcs SMD Micro USB 2Pin at USB.

7>.Step 7: Cut 1pcs 8Pin Male Pin to 2pcs 4Pin Male Pin. Then install them on U2. Note that the longer pin faces up.

8>.Step 8: Install 1pcs NE555 Board on 4Pin Male Pin. There is a mark(curved silk screen printing) on NE555 Board and there is a mark(curved silk screen printing) on PCB. These two marks are corresponding to each other and are used to specify the installation direction.

9>.Step 9: Install 1pcs Bend Pin PH2.0-5P Socket at P2.

10>.Step 10: Install 1pcs Straight Pin PH2.0-5P Socket at P3.

11>.Step 11: Install 1pcs TO-92 ALJ2302 MOS-N at Q1. Note that the arc of ALJ2302 corresponds to the arc silk screen on the PCB.

12>.Step 12: Install 1pcs 100uF Electrolytic Capacitor at C2.There is a white ‘+ ’on PCB silk screen printing where the positive(anode) can insert into.The longer lead is positive(anode)

13>.Step 13: Install 1pcs 3Pin Male Pin at P1. It needs short pads P0 if the Battery Charging Module does not need to be installed.

14>.Step 14: Install 1pcs 50Kohm Potentiometer at RP1.

15>.Step 15: Install 1pcs Bend Pin PH2.0-2P Socket on Battery Charging Module. Note: If your battery has no interface, you can connect it directly with wires without installing PH2.0-2P Socket.

16>.Step 16: Install 1pcs Battery Charging Module on P1.

17>.Step 17: Release potentiometer adjusting plate. It is recommended to use scissors or pliers to break PCB connection points.

18>.Step 18: Identify the positive(anode) and negative(cathode) lead of LED.The leads of the LED must be installed correctly, otherwise the LED cannot be turned on.Here are four methods as following:

18.1>.According to the length of the LED lead to distinguish. The longer pin is positive(anode) lead. The shorter pin is negative(cathode) lead.

18.2>.Identify the negative(cathode) of the LED is to look into the plastic case where one can see that the negative(cathode) is much thicker/bigger inside the plastic case than the anode lead.

18.3>.Identify by edge of plastic case.The negative(cathode) lead of the LED should be the pin nearest the flat on the plastic case.

18.4>.Test by 3V battery or multimeter.The pin is positive(anode) lead which has connect to the positive of 3V if LED can light up after connect 3V power supply.(LED should not be powered directly from the 3V for a short time:less then 0.5second)

18.5>.It is positive(anode) where the white mark “+ ”pointing to on PCB.

19>.Step19: Install 24pcs 5mm 0.5W White LED on LED Board. Pay attention to distinguish between positive and negative pole.

20>.Step 20: Fix 20cm Red/Black Wire on LED Board. Red connect to “LED+ ”pad and black connect to “LED- ”pad.

21>.Step 21: The other end of the wire is inserted through the top of the lamp post.Be careful not to push too fast.

22>.Step 22: Adjust the position of the LED lamp panel and prepare the lamp shade.Pay attention to the direction of the lampshade.

23>.Step 23: Fix lamp shade by 4pcs PA1.7*7 Self Tapping Screw.

24>.Step 24: Connect main PCB and Potentiometer Board by 10cm PH2.0-5P Wire.

25>.Step 25: Fix main PCB on bottom plate by 4pcs PA1.7*5 Self Tapping Screw.

26>.Step 26: Pass the wire through the central hole of the bottom plate.

27>.Step 27: Fix lamp post on bottom plate by 2pcs PA1.7*7 Self Tapping Screw.

28>.Step 28: Fix 20cm Red/Black Wire on Main Board at P4. Red connect to “LED+ ”pad and black connect to “LED- ”pad.

29>.Step 29: Connect 18650 Lithium Battery. Note: If your battery has no interface, you can connect it directly with wires.

30>.Step 30: Fix Potentiometer Board by nut. Note that the fixing point of the potentiometer is aligned with the hole of the housing.

31>.Step 31: Fix case by 4pcs PA1.7*5 Self Tapping Screw.

32>.Step 32: Install Knob Cap on Potentiometer. Rotate potentiometer to change the light brightness.

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