YH-8A voltage regulator of a sealed electronic devices, by adjusting the excitation current in order to stabilize the output voltage of the brushless generator.
Technical specification
Input
      Voltage         100-260V ac
Output
      Voltage         Max 90V dc at 240V ac input
       Current        Continuous 3A
                          Intermittent 5A for 10 secs
       Resistance    15 ohms    minimum
       Regulation    ＜+/-1.0%(with 4% engine governing)