Enigma/Odyssey installation manual - MGL Avionics

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Enigma/Odyssey installation manualTransponder interface wiring for Microair T2000 (ignore pin numbers on DB15 connector).Also line “Encoder power” is not used with Enigma.Page 20
Enigma/Odyssey installation manualAudio wiringEnigma and Odyssey provide two related audio outputs. These outputs carry voicemessages and alerts and other signals. One of the audio outputs is able to drive a smallloud speaker directly. The other output caries a low level signal intended to be fed intointercom systems that have a low level input. The high level output can often be useddirectly with intercom systems that provide high level inputs only.The audio outputs are not provided with internal volume control or mute. It is intended thatmute and/or volume controls are provided either as part of the audio intercom panel orthey can be easily added with components easily obtainable from electronic parts shopsas shown in the following images:This image shows the usage of apotentiometer to be used as volumecontrol. Here it is used plugged into thehigh level audio output. If a low resistancepotentiometer is used (for example 50ohms, 1W power capable), it can be usedto control the volume of an attached 4 or 8ohm speaker.If you are connecting to an intercomsystem or audio panel that does not allowvolume control, you can likely use highervalue resistance potentiometers but werecommend no to go larger than about1KOhm (1000 Ohms) in order to keepimpedances low which makes the audiosystem more resistant to interference fromother electrical systems.This image shows an alternativearrangement if you want to install a panelswitch to mute the audio signal. In thiscase a small SPDT switch has been used.In the muted position the audio input of theintercom system or audio panel isconnected to ground (shorted) to avoidpickup of electrical noise.Should you want to use a switch with aspeaker, you can use a simple switch todisconnect the speaker as required.Page 21
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Enigma/Odyssey installation manual - MGL Avionics

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