| 摘要 |
PURPOSE:To increase the productivity and to improve the accuracy, by constituting the circuit with a DC power supply, voltage set circuit, operational amplifier and feedback element. CONSTITUTION:When an input voltage Vn is greater than a value, the output voltage Vo of an operational amplifier 5 is increased, and the voltage V2 at the connection point between fixed resistors RB and RC of a voltage set circuit 2 is increased with the operation of a fixed resistor RF accompanied with it. When the voltage V2 is increased, the voltages V1, V2 across a variable resistor 3 are accordingly increased and then a set voltage Vi input to the operational amplifier 5 is also increased. Thus, when the set voltage Vi is equal to the input voltage Vn from a signal source 4, the output voltage Vo is neither high nor low, but it is stable at the state. |
