| 摘要 |
The invention relates to a protective circuit for protecting an output stage (5) in the event of faulty contacting of the electrical connections (2, 3, 4), wherein the output stage (5) consists of a driver unit and has an analog or digital signal output (4). According to the invention, in order to protect the output stage from a faulty connection in a simple and economical manner, the protective circuit comprises a first transistor circuit (T1), which is connected in series between the output stage (5) and the signal output (4), and a second transistor circuit (T2), which is connected in series between the negative supply connection (3) and the signal output (4). The second transistor circuit (T2) is connected to the base of the first transistor circuit (T1) in order to influence the first transistor circuit (T1) in such a way that the first transistor circuit becomes highly resistive in the event of a fault. |
