The Global Specialties PB-500 Portable Analog Circuit Trainer is a compact portable analog circuit design trainer with built-in power supplies and function generator. It can be used for analog circuit design and classroom training purposes with a unique combination of built-in functions and uncommitted devices. The PB-500 contains all of the functions required for studying and experimenting with active filters, operational amplifiers, and other analog circuitry. Utilizing the PB-500, students will learn valuable hands-on breadboarding techniques and build a solid foundation in circuit experimentation, construction and analysis. The PB-500 is powered by an included UL-approved wall-mount power adapter.