A simple op-amp, and pnp transistor or p-channel mosfet in the positive rail (example right), was the obvious answer to me, but what had other people done? One internet search later and, aside from ...

Similar circuits can be constructed for all sorts ... thus has either an “n-channel” or “p-channel” configuration. PNP transistors and n-channel transistors function similarly to ...

Transistors are basic components within electronic circuits. They are used as tiny electronic switches or current amplifiers or for a variety of other tasks. Modern computer chips – like Intel ...