PNPNPositive Negative Positive Negative
PNPNPositive-Negative-Positive-Negative (devices)
PNPNPolish Nuclear Physics Network (Poland)
References in periodicals archive ?
Karris covers basic electronic concepts and signals, semiconductor electronics, diodes, bipolar junction transistors, field effect transistors and PNPN devices, operational amplifiers, integrated circuits, pulse circuits and waveforms generators, frequency characteristics of single-stage and cascaded amplifiers, tuned amplifiers, sinusoidal oscillators, compensated attenuators, and more.