Utilizing parallel votage negative feedback circuits as a preamplifier it is possible to amplify signal and reduce circuit impedance as well as to simplify circuit and lessen volume.

• 利用电压并联负反馈电路作为仪器的前置放大器，可实现信号放大、阻抗匹配和降低线路阻抗的目的，其电路简单、体积小（可以在不改变原线路结构的条件下将放大器封装在探头上）。