A recorder with recording monitor function (most recorders), while in the recording state, the external microphone jack receives the audio signal, and the monitor jack also outputs the same audio signal. By using this function of the recorder, the intercom device can be installed to realize the intercom call at a certain distance. The greater the power of the recorder, the farther the call distance is.
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Figure 9.31-1 is a circuit diagram of the intercom device attached to the mono recorder. when
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