Electronics 01
Op Amp Gain Bandwidth Product Explained (Noise Gain)
Op amp bandwidth is GBW divided by the noise gain, not the signal gain. Worked LM358 and TL072 numbers, gain accuracy, slew rate and computed Bode plots.
amplifiers
Electronics 02
How Does a Transistor Amplify? It's a Valve, Not a Source
A transistor doesn't make energy: a millivolt on the base steers current from the supply. Transconductance, gain = gm × RC, and a worked common-emitter design.