We designed a large current AC constant current source of low frequency, and an electronic preamplifier with high sensitivity for the use of the instrument.
仪器中设计了大电流低频交流恒流源，高灵敏度前置放大器，并用单片机软件代替了大量电子线路的功能。
The overall design method of the power supply is put forward, constant-current source circuit and AC source circuit are developed separately;
提出了功放系统的整体设计思路，分别设计了恒流源电路与交流放大电路；
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