| 摘要 |
A permanent magnet alternating current generator has an incandescent bulb connected across the full-wave rectifier which furnishes a D.C. current to a load. The incandescent bulb varies the resistance of the photo resistor. A sufficient change in the resistance of the photo resistor causes the conduction of a transistor which in turn causes conduction of a triac which is connected in parallel with one of the two series connected output windings of the generator. When the triac becomes conductive, it short circuits the winding, lowering the output voltage, thus in turn causing the incandescent lamp to emit less light, varying the photo resistance to block the transistor and open the triac.
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