34903A is a General Transistor Kit manufactured by Microchip Technology. It is a 16-position programming board that is used to emulate a wide variety of commercial and industrial transistor configurations. The kit includes 20 transistors, one Darlington transistor, one Metal Oxide Semiconductor Field Effect Transistor (MOSFET) and an 8-bit MPU400 Microcontroller with a ROM, RAM, two 8-bit A/D inputs, and two 4-bit parallel I/O ports. It also features 31 general-purpose transistors and a variety of additional components as well as 49 programmable logic element/combinatorial selector/decoder/gate networks. The kit is designed to be used in applications such as motor and relay control, audio and video switching, motor speed control, and general interface circuits.