| 摘要 |
<p>The current reducing circuit for a relay (A) operated by a battery (UB) permits a reduction of the holding current to keep losses to a min. A transistor (T1) is in series with the relay and the switch (a) controlled by the relay. A second transistor (T2) is connected across the switch. The first transistor is connected to a power supply by two resistors (R1, R2). At their junction is a connection to the second transistor, and also a diode (D) connected to negative. Thus the relay coil is in the collector/emitter path of the first transistor. The base voltage of this transistor is the control voltage of the second transistor. Alternative circuits use only transistors and resistances.</p> |
