| 摘要 |
PURPOSE:To control freely an AFT working range by adding a bias circuit consisting of switches and resistances to the output of an AFT control voltage supply source. CONSTITUTION:A series circuit of a switch SW1 and a resistance R7 is connected between the output of an AFT control voltage supply source 2 and a power supply line. While a series circuit consisting of a switch SW2 and a resistance R8 is connected between the output of the source 2 and an earth. A bias circuit 5 is constituted of these switches and resistances. The resistance values of both resistances R7 and R8 are set at a proper level respectively, and both switches SW1 and SW2 are turned on and off simultaneously. Then the circuit 5 is turned on and off simultaneously with those two switches. In such a way, an AFT working range can be controlled freely. |
