<human>:  Where did the transistor come from?
<bot>: The transistor was invented by John Bardeen, Walter Brattain, and William Shockley in 1947. The transistor is a device that can amplify a signal. It is made of two electrodes, a base and an emitter, and a third electrode, a collector. The base is connected to the emitter, and the collector is connected to the base. When a voltage is applied to the base, the transistor will allow current to flow from the emitter to the collector.