| 摘要 |
PURPOSE:To enable the negative pole of a flash capacitor and the negative pole of a primary electric source to be connected by supplying the current equivalent to the charging current of a flash capacitor to the base of an oscillating transistor. CONSTITUTION:The collector of a transistor TRQ2' of which the base is connected to the base of TRQ3' connected to the winding S of an oscillating transformer T. Because of this, the charging current of a flash capacitor C1, that is, the current equivalent to the collector current of the TRQ3' is formed as the collector current of the TRQ2' and this current is supplied as the base current of the TRQ1. Hence, even if the negative pole of the capacitor C1 is not connected to the base of the TRQ1, oscillation operatiom may be stably maintained and the negative pole of the capacitor C1 and the negative pole of a primary electric power source E may be connected. If this charging circuit is used, the charging voltage of the flash capacitor may be accurately detected. |
