Audio Developments AD149 - Manual (Page 59)

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This module controls all metering of PFL and output signals, and also the level of
main and auxiliary output signals. Calibration is achieved when the faders and
auxiliary potentiometers are at maximum.
The upper meter (1) reads left output, auxiliary 1, monitor 1 left, PFL left and the
lower meter (2) reads right output, auxiliary 2, monitor 1 right, PFL right - by use of
switches (10), (11), (12). When no switch is selected, meters read main L-R output;
thereafter, switch (11) overrides switch (10) and switch (12) overrides switches (10)
and (11). Switch (11) reads the signal entering monitor 1 path; a signal that can be
either in the L-R domain or in the M-S domain. Battery status is read on the upper
meter by BATT (8) and the meters may be illuminated by ILL (9) - overuse of this
function will rapidly drain the batteries. When the voltage drops below a safe
operating level, the MIX ON indicator LED (7) will flash.
Output signals to be metered follow output faders, matrix amplifiers and limiters.
When the auxiliary paths are being used as a stereo pair, their output potentiometers
(20) and (21) may be linked (23) for one-handed operation - AUX 2 becoming the
stereo master. A matrix amplifier may be inserted across auxiliary 1 and 2 outputs,
MTX (17).
Separate Penny & Giles output faders (18) and (19) are employed for maximum
flexibility, but may be linked by a ganging clip.
A pair of limiters may be switched into the main L-R output - LIM (4) - and linked for
stereo operation - LINK (5). A choice of fast or slow attack and release times may be
made via the two DIL switches on the left-hand PCB. When the limiters are being
used as a stereo pair, they should have their attack times and release times set
identically. LEDs (3) indicate when limiting is taking place. A matrix (6) may be
inserted in the main L-R output path.
LEFT-HAND PRINTED CIRCUIT BOARD
FIG 12