Ping Shang teaches you: Make a flashing light with LED patch

Ping Shang teaches you: Make a flashing light with LED patch

Material: a 1000uF16v electrolytic capacitor, a 3.3uF50v electrolytic capacitor, a c945 triode, a 1kΩ resistor.

Stand the 1000uF capacitor on the desktop with the top down. There are two metal pins at the bottom, the positive pole on the right side and the negative pole with gray stripes on the left side. Solder one end to the negative pole.

C945 triode, the pin arrangement is ecb from left to right. It is a current amplifying element with 200 times magnification. Solder the transistor emitter to the positive pin of the capacitor.

Solder the positive pin at the bottom of the 3.3uF capacitor to the emitter of the transistor and the negative electrode to the base of the transistor. And fix it on the side wall of the triode with hot melt glue.

This is a LED patch lamp with a working voltage of 3 volts and a current of 10-20mA. The right side is the positive electrode, and the left side is the negative electrode.

Use hot melt glue to bond the bottom of the patch to the top of the 3.3uF capacitor. A thin wire is used to connect the positive electrode of the patch and the collector of the triode, and another thin wire is used to connect the negative electrode of the patch and the negative electrode of the 1000uF capacitor.

Use an electric soldering iron to solder a thin wire to the positive pin of the 1000uF capacitor, which serves as the positive wire for the power input. Then weld another thin wire to the other end of the resistor as the negative terminal of the power input. The main device is ready and set aside for later use.

Put the finished device into the plastic tube, and the patch is parallel to one end of the plane. Use hot melt glue to glue the round plastic sheet to the nozzle and close the nozzle.

Glue the other end of the round plastic tube to the base and draw out two thin wires, be sure to remember the positive and negative poles. The right side is the positive electrode, and the left side is the negative electrode.

Glue the top of the two screws to the side wall of the base, and wind the two thin wires on the screws respectively, and the welding is firm. The screw is used as the power terminal, the right side is the positive pole, and the left side is the negative pole.

Finally, switch on the 12 volt DC power supply, the SMD lamp starts to lighten and flicker slowly, and flickers at a certain frequency, about 1 to 2 seconds.