Dixon Systems NM-250 MKII Manuel du propriétaire télécharger pdf (Page 19)

Dixon Systems NM-250 MKII

Logic and Control

All signal switching in the NM-250 MKII is accomplished using miniature 24 VDC

relays. Each time a microphone is turned on, it activates the Mic relay (which delivers

audio to the summing bus), illuminates the ‘channel on’ LED, and, if the mute jumper is

installed, activates the mute relay. The telephone-channel relay also provides the

contact closure to ground at the remote connector.

In addition, there are ‘start’ and ‘stop’ pulses ( to ground through open collectors)

available for both the telephone and computer channels. These pulses are

approximately 100ms in duration. Pulse duration is determined by the 6.8 ufd capacitor

and the 100k resistor. Tally lights for the talkback switches are simple ground starts.

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Dixon Systems NM-250 MKII Manuel du propriétaire Page 19