该二极管象一个可变的电阻。当电容器的充电电流很大时，其阻值很低；而电流随时间变小时，其阻值增大。
The diode ACTS like a variable resistance, low when the charging current to the capacitor is high, then increasing in value as the current decreases with time.
所述放电回路包括一放电二极管，该放电二极管并联于所述限流充电电阻两端；
The discharging loop includes a discharging diode connected to the current limiting charging resistance in parallel.
一支放大的晶体管然后检查剩余电压在这个二极管，并且这个二极管再被再充电。
An amplifying transistor then checks the remaining voltage on the diode, and the diode is recharged again.
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