SD Series Electromagnetic Buzzers TDK SD Series Electromagnetic Buzzers are high reliability, compact, pin terminal type electromagnetic buzzers with 2048Hz output designed for automobile equipment. Their pin type terminal construction enables direct mounting onto printed circuit boards.The TDK SDC Series Electromagnetic Buzzers have built-in oscillator circuits so that output can be produced by merely connecting to a DC power supply. This circuitry utilizes chip-type componetns for significantly reduced size and high reliability.Learn More