| 摘要 |
PURPOSE:To prevent the oscillation stoppage by comparing the output of an operational amplifier with a voltage set arbitrarily, and when an output voltage is lower than the set voltage, adding the bias voltage to the input of the operational amplifier, and making the output voltage of the operational amplifier equal to the set voltage. CONSTITUTION:The output of an operational amplifier 4 is compared with the arbitrarily set voltage, and when an output voltage is lower than the set voltage, the bias voltage is added to the input of the operational amplifier 4 and the output voltage of the operational amplifier 4 is made equal to the set voltage. When the output voltage of the operational amplifier is higher than the set voltage, a diode 9 is cut off and the circuit of an operational amplifier 8 becomes virtually same as it is cut off. Thus, the oscillation stoppage of a voltage variable oscillating circuit can be prevented. |
