Finally a diode, D1, connects to the train line. The base of the current limiting transistor, Q2B, is connected to the Q1E-R2 node and Q2’s emitter to R2-D1 anode. Transistor Q2’s collector is tied to ...

Another circuit for hot-swap applications (Figure 2) uses a pnp transistor (Q1) and current-sense resistor (R1) to provide continuous current sensing and limiting. As power is applied, current flows ...

The simple addition of a transistor and resistor to the open-circuit drive overcomes this dilemma by limiting current through the drive transistor. Transistor Q2 provides the open-collector drive ...

The current limiting circuit, though, is where things get interesting. Rather than use an op-amp, [DiodeGoneWild] chose a simple discrete transistor current-sense circuit.

Another current limiter uses a P-channel MOSFET as a pass device, with gate voltage controlled by a transistor that amplifies the R SENSE voltage drop. 3 This circuit experiences a drop as low as ...

Instead of these exotic current limiting diodes, he could have used a current source or current sink consisting of an PNP or NPN transistor respectively, a (zener) diodes, and 2 resistors.

In this lesson, students build two circuits and explore how transistors function. When Bell Labs introduced the transistor in June of 1948, a spokesman proudly announced "This cylindrical object ...

Enhances electronics capabilities to survive fault conditions through active current limiting. Adapts to fault conditions using thermal shutdown fault mode protection @ 128˚C die temperature. Reduces ...