Electrical circuit, particularly output driver for microcontroller, has switching element, and emitter resistor arranged on emitter of output transistor, such that signal input is connected with base of output transistor by series resistor

摘要

The electrical circuit has a signal input (IN) and a signal output (EXT) formed as an open collector of an output transistor (Q2), where the signal input is connected with the base of the output transistor. An emitter resistor (R5) is arranged on the emitter of the output transistor, such that the signal input is connected with the base of the output transistor by a series resistor (R4). The base of the output transistor is connected to the ground through a switching element (Q3). The switching element is turned on, when the voltage at the open collector of the output transistor has a preset.