| 摘要 |
A flasher unit for bouys, beacons and the like for flashing an incandescent lamp (24) in a required sequence of short and long flashes having short or long eclipses between flashes. A counter (40) is provided having a number of counts equal to the number of flash-eclipse pairs required. A timing pulse generator (34) is selectively controlled to produce timing pulses during each count that are temporarily spaced in accordance with the flash-eclipse time durations during each count. Certain ones of the timing pulses serve to clock the counter. Lamp control pulses are generated during each count for energizing the lamp for the preselected time duration. A sync pulse is generated at the beginning of every flash and a second pulse during the first flash in a sequence. These pulses are externally available and are communicated to other flasher units for synchronization. The unit will also synchronize to incoming sync pulses. A photocell circuit (70) inhibits flashing during daylight periods. |
