Audio Developments AD149 - Manual (Page 35)

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The unbalanced, send outputs have low-impedance with a capability of driving
headphones of 25 ohms impedance or greater. (Refer to page 68)
The balanced (or unbalanced) signal from the outstation feeds on to the PFL mixing
buss and is routed by grounding the control line (Pin 6) at the external source.
Thus, a two-way conversation can take place between mixer and a boom operator
with the boom operator being able to listen to programme when no communication is
taking place.
A three-position rocker switch BATT/EXT (14) selects either internal batteries or an
external DC source. Power to the mixer is confirmed by the MIX ON LED on the
output module. This LED flashes when the internal voltage falls below the safe
operating level of 10v.
External powering of the mixer is via a 4-pin XLR (15).
XLR
Pin 1 0v Pin 3 NC
2 Charge 4 12-15v DC
A suitable external power supply is Audio Developments’ AD100-09, but any external
DC source must be capable of delivering 750mA at 12v.
SUB 1 (16) is a 15-way ‘D’ connector which may be used to drive an external meter
bridge and supply the necessary DC voltages. The four meters read Left, Right,
Auxiliary 1 and Auxiliary 2 outputs. When a meter bridge is being used, the mixer’s
meters may be routed ‘permanently’ to monitor 1 or PFL. (All signals are
unbalanced.) SUB 1 is also employed when a recorder is to be controlled remotely.
CONV IDC CONV IDC
PIN 1 (1) Chassis PIN 8 (15) +v voltage rail
2 (3) Spare 9 (2) 0v
3 (5) N/C contact - Remote 10 (4) PFL left output
4 (7) Common - Remote 11 (6) PFL right output
5 (9) N/O Contact - Remote 12 (8) Aux 2 output
6 (11) PFL control 13 (10) Aux 1 output
7 (13) -v voltage rail 14 (12) Right output
15 (14) Left output
CONV refers to the normal numbering of a ‘D’ type connector, but note that some
IDC types are numbered as indicated in ( ).