Working principle: The electronic anesthesia circuit is shown in the figure below. Since the transistor oscillator is basically a constant current source, when two or more sets of outputs are simultaneously (such as four groups), if one set of output amplitude is large, then another The output of several sets of negative pulse parts is correspondingly reduced. This means that they will affect each other. This is very unfavorable for electrical anesthesia and must be avoided. To eliminate this shortcoming, connect with a Zener diode. 
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Figure 7.3
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