| 摘要 |
A circuit which can be connected in a fluorescent lamp fixture in place of the starter, to create a bright, psychedelic flashing effect. The circuit includes a silicon controlled rectifier (SCR) that is turned on by a timing circuit once in every several cycles of the A.C. source to clamp the voltage across the fluorescent lamp to a low level so that the lamp cannot light. The timing circuit preferably operates the SCR a minority of the time so that the lamp is on most of the time to provide a high average illumination level, and the timing circuit preferably operates the SCR to turn off the lamp at rate of at least 5 times per second so that the sensed effect is similar to that of a bright light flashed on for a brief time rather than a moderate intensity light that is turned off for a brief time. The timing circuit includes a diode, resistor, and timing capacitor connected in series across the lamp terminals, and a diac or neon tube connected across the capacitor and to the gate of the SCR to discharge the capacitor and turn on the SCR once in every several cycles of the A.C. source.
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