SPICE simulations about BJT NPN and PNP as Switch, as Amplifier, Characteristic curves Ic-Vce of BJT, Optimal biasing of BJTs, Single Stage and Multistage BJT Common Emitter, Common Base, Common Collector, N and P Channel JFET as Switch, as Amplifier, Optimal Biasing of JFET, Characteristic curves Id-Vgs of JFET, Enhancement MOSFET N Channel Biasing, Depletion Mode MOSFET N Channel Biasing.