A new and improved electric fish finder with resources for printed circuit board fabrication

ABSTRACT We describe the circuit design, construction, and operation of a field-portable electric fish finder (an AC-coupled wide-band differential bio-amplifier with loudspeaker output). This device permits detection and monitoring of the electric organ discharges generated by neotropical gymnotiform fishes (as well as the mormyroid fishes of tropical Africa). Our design is modified from earlier versions to optimize detection performance and stability over a wider range of ambient water conductivity, including under conditions of extremely low conductivity (< ca. 10 μScm-1). Our new electric fish finder design also incorporates complete waterproofing and longer battery autonomy. We provide Gerber and Eagle files made with the electronic design automation software ‘Autodesk Eagle’ to allow researchers to order printed circuit boards directly from commercial manufacturers.

摘要：本文详述了一款野外便携型电鱼探测仪的电路设计、硬件搭建与运行方案——该设备为一款搭载扬声器输出的交流耦合宽带差分生物放大器。本设备可检测并监测新热带裸背电鳗目鱼类（以及非洲热带长颌鱼目鱼类）所产生的电器官放电信号。本设计基于早期版本优化改进，可在更广范围的环境水体电导率区间内提升探测性能与运行稳定性，涵盖极低电导率（约<10 μS·cm⁻¹）的应用场景。本新型电鱼探测仪还集成了全防水结构与更长的电池续航时长。我们提供了由电子设计自动化软件"Autodesk Eagle"生成的Gerber文件与Eagle设计文件，以便研究人员可直接向商业制造商订购印刷电路板。