| 摘要 |
a dc incandescent lamp; a first resistor (R1) with a low resistance; a second resistor with a high resistance (R4); a diode rectifier (D), the ac input side being connected in series to an ac source through the first resistance, and the dc output side being connected in series to the incandescent lamp through the second resistance; a voltage regulator diode (Z) connected in parallel to the ac input side of said diode rectifier; a switching device (SCR) and a timing circuit (R2;R3;C3) connected to said switching device.
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