Fuhjythy Flashlight DIY Kit DIY Flashlight 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. Working voltage: 1.5V (1 * AAA battery; battery not included) We used No. 7 battery for multiple tests. Generally, the brightness is relatively bright within 5 hours, and the brightness be slightly behind. The circuit is simple, the production is easy, and one board is multi-purpose. 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.