This circuit uses pulsed current to check transistor hFE on an oscilloscope. The circuit creates the biasing conditions specified by the transistor’s manufacturer.

The circuit acts like an efficient diode. With Enable low, the hot-swappable side has no effect on the signal, with or without power applied. The two-transistor circuit offers the additional benefit ...

Thus the three basic bipolar transistor circuit configurations have equivalents with a FET; common-emitter becomes common-source, common-base becomes common-gate, and an emitter follower becomes a ...

This automatic battery-charger, built around a single transistor, starts charging when the battery voltage drops beyond a preset value and stops when once an upper preset voltage is reached.

SAN FRANCISCO &#151 Researchers from the Israel Institute of Technology have developed what the university claims is a “transistor in a test tube”, built via sequence-specific molecular lithography.