– Information on datasheets The Transistor (NPN) • A current amplifier … – Makes small currents BIGGER • The 2N3904 Transistor β = 30-400 C= Collector B = Base E = Emitter Important 2N3904 Specifications from the datasheet Note high maximum ratings BUT 200mA maximum current 2N3904 Datasheet • Posted on the ME456 website
Schematic of very Simple preamplifiers using 2N3904. In electronics, a common emitter amplifier is used as a voltage amplifier. In this circuit the base terminal of the transistor serves as the input, the collector is the output, and the emitter is common.
Jan 02, 2020 · One of the various parameters of the 2N3904 transistor is known as the beta, or current gain, which is the ratio of the collector current to the base current. For a current gain of 100, a change of 0.001 ampere (A) in base current results in a change of 0.1 A on the collector. This suggests how the 2N3904 transistor can become an amplifier.
2N3904 General Purpose Transistors NPN TO-92 Page 1 31/05/05 V1.0 High Speed Switching Features: • NPN Silicon Planar Switching Transistors. • Fast switching devices exhibiting short turn-off and low saturation voltage characteristics. NPN switching transistor 2N3904 DATA SHEET STATUS Notes 1. Please consult the most recently issued data sheet before initiating or completing a design. 2. The product status of the device(s) described in this data sheet may have changed since this data sheet was published.