EM实用板UBc
通用PCB板UBc为增益控制电阻、电源连接、输入端点、直接输出和滤波输出等预留了位置。滤波输出是通过极点为1Hz的无源滤波器输出，这样可以将调制信号最小化。
当使用滤波输出时，无源滤波器将增大反馈回路的时间常数。时间常数这取决于反馈电阻和电容。
输出信号也可以从直接输出引脚输出，而不经过无源滤波器，这样时间常数由反馈元件决定。
EM Utility Board UBc
The Utility PC Board has positions for gain determining resistors, power supply connections, input terminals and direct and filtered outputs. The filtered output is taken via a passive filter, which has a pole of 1Hz, to minimise the modulation component.
When the filtered output is used, the passive filter is additional to the feedback time constant set by the feedback resistor and capacitor.
The output may be taken from the direct output pin, thus by-passing the passive filter, in which case the only filtering is the time constant set by the feedback components.
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