The paper introduces a adjust voltage integration regulator LM317 in common use, this kind of utility circuit emphasize the sides of high voltage output circuit.
本文介绍目前常用的电压可调集成稳压器LM 317实用电路，着重在高压输出电路方面。
In the paper, the calculating method of signal extraction filter pass-band according to the paper-counting speed and the utility circuit of separating strong interference in pass-band are given.
并针对点钞速度给出了信号提取滤波器通频带的计算方法，以及在带内分离强干扰的实用电路。
The circuit has a characteristic of high accuracy of voltage transfer and current transfer, simple structure, easy realization, low cost, and good utility.
该电路具有电压传输和电流传输的精度高、结构简单、易于实现及成本低廉且实用性好的特点。
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