| 摘要 |
PURPOSE:To execute balancelessly and bumplessly automatic/manual switching in both directions by using an automatic input signal as an automatic operating output at the time of an automatic operation, and making an output signal of an amplifier follow a value of a manual operating output at the time of a manual operation. CONSTITUTION:By an operation of automatic/manual changeover switches SW1-SW3, a negative feedback amplifier of a gain 1 is formed by an amplifier 1 and a feedback circuit 2 at the time of an automatic operation, and an automatic input signal is used as an automatic operating output through the negative feedback amplifier and a holding amplifier 3. On the contrary, at the time of a manual operation, as an input of the amplifier 3, an automatic operating output value (holding outut value) immediately before switching is made a reference, and from this value, an increase and decrease signal is added as a manual operating signal and is used as a manual operating output, and also an output signal of a negative feedback circuit which inputs a difference signal between an output of the amplifier 1 which inputs the automatic input signal, and the manual operating output is used as a negative feedback signal, so that an output signal of the amplifier 1 follows a value of the manual operating output. |
