Pre-amplifier of inductosyn and inductosyn thereof

The invention discloses a pre-amplifier of an inductosyn and an inductosyn thereof. The pre-amplifier comprises a pre-stage amplifier, a post-stage amplifier, a first potentiometer, a second potentiometer, a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor. A pin 1 and a pin 8 of the pre-stage amplifier are electrically connected with the first potentiometer; a pin 2 and a pin 3 of the pre-stage amplifier are electrically connected with a fixed scale; a pin 6 of the pre-stage amplifier is electrically connected with a pin 2 of the post-stage amplifier; a pin 1 and a pin 8 of the post-stage amplifier are electrically connected with the second potentiometer; a pin 6 of the post-stage amplifier is electrically connected with the first terminal of the fifth capacitor; and a second terminal of the fifth capacitor outputs signals. According to the invention, the pre-amplifier has advantages of small in nonlinear distortion, good in