Flashlight DIY Kit Simple Integrated Circuit Board Welding

The product information is as follows:

Name:1.5V Flashlight DIY Kit Simple Integrated Circuit Board Soldering Practice Suite Electronic Components Welding Training
The portable flashlight kit realizes the function of flashlight with a small number of components, and has the advantages of simple circuit and easy production.
The circuit is simple, the production is easy, and one board is multi-purpose.
Working voltage: 1.5V (1 * AAA battery; battery not included)
We used No. 7 Nanfu battery for multiple tests. Generally, the brightness is relatively bright within 5 hours, and the brightness will be slightly behind.
Principle of operation:After switching on the power supply, triodes Q1 because the base is grounded through R1, and the voltage at both ends of c1 cannot be suddenly changed. The base potential of Q1 is lower than that of emitter E, Q1 conducts, and the base B of 02 has a current flowing into Q2, and Q2 also conducts.

The current flows from the positive electrode of the power supply through the collector C of the inductor L1 and Q2 to the emitter E and returns to the negative electrode of the power supply. The self-induced EMF on L1 is positive on the left and negative on the right. As the power supply charges C1, the voltage at both ends of C1 increases gradually, the base B potential of Q1 increases gradually, the base current of Q1 B1 decreases gradually, the base current of 02 also decreases gradually, and the charge of L1 decreases gradually. At this time, the induced electromotive force above L1 changes to the left negative electrode and the right positive electrode, until Q1 exits the saturation conduction. Q2 also exits saturation conduction (triode cutoff), the energy stored on L1 is released, and the voltage generated by L1 and the power supply voltage are superimposed and added to the LED, so that the voltage at both ends of the LED increases and flashes.
Colour:black
Material:Plastics + components
note:It's DIY kits, needs to finish by yourself.
note:PCB board and accessories colors are multiple, don't accept the specified color and accessories
Due to different batches, there may be differences in product appearance and printed text, which will not affect use

Package Contents:
1 * Flashlight DIY Kit

Only the above package content, other products are not included.
Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.