electronic of bipolar junction transistor npn type on white background

active arrow background bipolar bjt black board circuit closeup component conductor current design development device diagram documentation drawing educative electric electrical electricity electronic electrotechnical electrotechnics electrotechnology element engineering equipment ewaste field graphic gray icon industrial industry isolated junction layout many metal mounting network nobody npn object part pcb pictogram picture pile polarity repair schematic scheme science semiconductor service shop single spare standard symbol tech technical technology terminal three throughhole transistor type white wire wiring