| 摘要 |
PURPOSE:To feed efficiently with little power-supply by switching a feed from two feeding terminals of a line amplifier to the line amplifier of the front steps and rear steps of the same amplifier with a switching group. CONSTITUTION:When only a switch SW1 is closed and other switches are opened, from a non-illustrated power-supply through a feeding terminal POW1-a main line TL, the line amplifier of front steps is fed from a line amplifier 1. When only a switch SW2 is closed and other switches are opened, from the power-supply through the feeding terminal POW1-the main line TL, the line amplifier of rear steps is fed from the line amplifier 1. When either switches SW1, SW2, SW9 and SW10 or SW7, SW8, SW9 and SW10 are opened and other switches are closed, from the power-supply through the feeding terminal POW1 or a POW2, the branch edges of the line amplifier 1 BA1, BA2, BA3 and BA4 are fed. When either switch SW9 or SW10 is closed and other switches are opened, from the terminal BA1 to the terminal BA2, from the terminal BA3 to the terminal BA4 or in a reverse direction, the electricity is supplied.
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