| 摘要 |
The current in a controlled device such as a light emitting diode (LED) 10, driven by a transistor switch Q1, is stabilized by a current control circuit including a comparator type feed-back network Q3, Q4, Q5, Q6, which stabilizes the voltage at a node 11 located between said switch Q1 and the series connection of a ballast resistor R and LED 10.
|
