907-0601-00 Rev. C Model 907 Video/Data Multiplexer – User’s Guide
Focal Technologies Corp. Page 5-10
5.8 907-AUDIO-T (4- Channel Audio Transformer Card)
The 4-channel 907-AUDIO-T expansion card allows for easy integration of audio transformers into a
Model 907 multiplexer stack. It consists of an array of transformers and an array of resistors, as shown in
Figure 5-8. The 1:1, 600-ohm impedance transformers can be used to isolate grounds between audio
components, or to provide a single ended speaker output from the differential output of the 907-AUDIO
expansion card. The transformers can also be looped back through the on-board resistors in order to
attenuate the signal. Note that for the input connectors J9 to J16, pin 1 is input (+) and pin 2 is input (-) and
for output connectors J1 to J8, pin 1 is output (-) and pin 2 is output (+).
Figure 5-8: 907-AUDIO-T Expansion Card
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