Sell (On Sale) Active Buzzer Module Ky-012 For Accessories Xd best price

The structural principle of buzzer (i) introduction to buzzers - the role of buzzers: buzzers are an integrated structure of electronic buzzers powered by dc power and widely used in electronic products such as computers, printers, photocopiers, alarms, electronic toys, automotive electronic equipment, telephone machines, timers, etc. - buzzer classification: mainly divided into piezoelectric buzzer and electromagnetic buzzer types. - circuit graphics symbols of buzzers: buzzers are represented in the circuit by the letters "h" or "ha" (used to be "fm, ""lb,"" jd," etc.). Schematic diagram of buzzer (ii) structural principles of buzzers - piezoelectric buzzer: piezoelectric buzzer consists mainly of harmonic oscillators, piezoelectric buzzer, impedance matcher and resonant box, shell, etc.Some piezoelectric buzzers also have leds on their shells. A multi - harmonic oscillator consists of a transistor or integrated circuit.When connected (1.5v-15v dc working voltage), the harmonic oscillator starts to vibrate, output 1.5-2.5 khz audio signal, impedance matching device pushes piezoelectric buzzer sound. Piezoelectric buzzer is made of lead zirconium titanate or lead niobium magnesium acid piezoelectric ceramics.Silver electrodes are plated on both sides of the ceramic plate, and are polarized and aging, then glued to brass or stainless steel plates. - electromagnetic buzzers: electromagnetic buzzers consist of oscillators, electromagnetic coils, magnets, diaphragms and shells. When connected, the current of audio signal generated by the oscillator passes through the electromagnetic coil, which produces a magnetic field.Vibration diaphragms vibrate periodically in the interaction of electromagnetic coils and magnets. (iii) production of buzzers (1) preparation of electromagnet m: wrap 100 wires around about 6 cm long iron bolts, leaving 5 cm lead wires at the end of the wire, and glue the coil with a transparent tape to prevent it from loosening and sticking it onto a box. (2) shrapnel p: cut a long piece of iron about 2 cm wide from the tin tin box, bend it at right angles, attach a lead wire of the electromagnet to the shrapnel, and attach the shrapnel to the board with a tape. (3) make contact q with a cookie needle, pad it high with a book, stick it to a tape, and lead a wire, as shown in the diagram, to a good circuit. (4) adjust the distance between m and p (through mobile boxes) so that electromagnets can attract shrapnel, adjust the distance between the contact point and shrapnel so that they can be in contact and hear buzz after electricity is generated. (iv) active buzzers and passive buzzers Teach you to distinguish between active buzzers and passive buzzers A small buzzer sold on the market is now widely used in circuits such as electrical equipment, electronic production and single-chip microcomputers, because of its small size (llmm in diameter only), light weight, low price and solid structure. The two buzzers seem to be the