User's Manual Part 6
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+5V is provided from the main regulator via the options connector. +8V is provided by a
TO-92 3 terminal regulator. This is also available on the T2000-80 PCB D-range connec-
tor, for powering an optocoupler transistor used for line key current detection. The
+13.8V input of the regulator is derived from the options connector. The +3.2V rail pro-
vides bias to the audio stages and is derived from the +8V regulator. The unswitched
+13.8V from the options connector powers the line drive amplifier, and is available on
the T2000-80 D-range for use as an unisolated line key supply option.