The DM-10 uses two toroidal transformers (one for each channel), and the B-100 uses one which supplies both channels.
而DM - 10采用两个环形变压器（每个通道一个），和B - 100使用一个， 供应两个渠道。
2
The toroidal core was excited by sharp pulse current. The sensor circuit is composed of peak value detector, Butterworth low-pass filter and differential amplifier.