It is best to charge lithium batteries with constant current, then constant voltage. The cut-off voltage of lithium batteries when fully charged is 4.2V, so simple series resistors and diodes cannot meet the requirements. The 5v solar panel is equivalent to the USB voltage (there is no 5v when the light is not good).
Method: It is best to make a simple circuit to solve the problem . You see, changing the value of 1k resistor can change the charging current. l1\l2 is a color changing LED. It will change color to indicate when it is fully charged.
If you directly use the charging circuit of the mobile phone holder to solve the problem, the current output of the solar panel may not be enough (what is the output current of your solar panel)? R4 is worth 10k, not 15k.
The cel guylules solar has come to help find out what the problem is! Thanks for the solution
This question is entirely based on assumptions.
The component specifications are generally 4×9, 6×6, 6×9, 6×10, 6×12, analyzing from the package size of 350*750, they should be 4
p> ×9=36 specifications. 350/4 = 87.5, 750/9 = 83.3, the side length of a single piece should be about 80, that is, the 156 × 156 battery cells are divided into 4 equal parts, each small piece measures 78 × 78, a total of 36 small pieces, and 156 drum pieces are needed for 9 pieces.
Component Power: Each 156 battery is approximately 4W, totaling 36W;
Voltage: The working voltage of each part is about 0.5V, 36 parts are connected in series, and the working voltage is about 18V.
p>1. Firstly, check if there is any problem before the ofsecond cleaning. The problem of flocking or silicon wafer has already been explained.
2. before it is broadcast. Failure to dry will cause problems. There is no suede surface in the water, resulting in white spots after PE. White spots do not have a suede surface under the microscope.
3. if it is wet engraving, otherwise there will be dust pollution after cleaning!
4. I don't know if you are using plate type PE. If it is plate type PE, it is probably silicon nitride dust and the equipment needs to be cleaned!
Your photo is really not clear!