1.5V Flashlight DIY Kit Simple Integrated Circuit Board Soldering Practice Suite For Electronic Components Welding Training

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Product Introduction

Shell size :55*35*15mm

PCB board size :5CM2CM1.0MM

Operating voltage :1.5V (AAA Number 7 battery)

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.

How long can an LED work on a single battery?

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.

List of components

Plastic shell 1

PCB board 1

8*8 self-locking switch 1

7mm self-locking switch cap 1

Single core wire 5CM 1

8550 triode 1

8050 triode 1

5MM straw hat LED 1

330UH inductor 1

102 ceramic chip capacitance 1

510 Euro resistance 1

20K resistor 1

Battery positive electrode plate 1

Battery negative electrode plate 1

Spare parts shipped without batteries oh, please pay attention to your own 1 7 battery

Welding steps: the first welding height is relatively low resistance and switch, switch has 2 rows of pins arbitrarily use one of the row can, the switch pin folded into 90 degrees foot welding up

Notes

1. Pay attention to the components on the board starting from the small volume welding, and then welding the large ones.

2. Some components, such as resistors and capacitors, are temporarily out of stock. We will send the components with values near the symbol circuit principle instead. The blue metal film resistance may be replaced by the gray carbon film resistance, and the gray carbon film resistance may be replaced by the blue metal film resistance. It's the same effect.