Gilderfluke&Co 16 Bit CD-Quality Digital Audio Systems - Manual (Page 30)

output is limited to driving low current loads like solid state relays, optoisolators, logic
level inputs and LEDs. When attaching to a logic input, just use pullup resistors (4.7 Kohm
typically) to the logic Vcc, and pick up to output at the DE-09 output pin. For the base
resistor in series with a LED, use a 1 K at 5 volts, 2.2 K at 12 volts, and a 4.7 K at 24 volts.
These will limit the current to about 5 ma. through the optoisolators. Solid state relays
need no current limiting resistors, as they are internally current limited to the proper lev-
els.
4 & 9 AES/EBU: This is the direct output from the CS8401 AES/EBU driver chip. Although this
chip outputs a differential signal, to fit the specifications for SPDIF (single ended output),
AES/EBU (balanced output) or Optical (fiber optic), it needs to be fed through a pulse
transformer and a few resistors first. A Small PC board with these parts and the appropri-
ate connector (along with the CS8401 chip) are available from Gilderfluke & Company
as part numbers ÔSPDIF-OUTÕ, ÔAES/EBU-OUTÕ, and ÔOPTO-OUTÕ respectively.
j) Digital Audio Bus: 21 Fifty position enclosed header compatible with IDS-50 connectors. This
connector can be used to bus several signals between interconnected card cages. If used,
these signals are:
1) Digital Audio Bus: This includes the clock and bus master signals, so only one card
within any set of interconnected card cages can be used as the bus master.
2) DMX-512: This eliminates the need to connect the DMX-512 input to each of the inter-
connected card cages.
3) RS-422: As with the DMX-512 above, this signal is bused to all other interconnected card
cages to eliminate the need to connect the RS-422 to each one individually.
This connection is not available on the AB-3000 AudioBrick.
k) AB-3000 Audio Outputs: The AB-3000 AudioBricks use two 1/4Ó phone jacks for their audio out-
puts. Electrically, these are identical to the outputs of the DR-3000s. As shown on the AB-3000
case silkscreening, if you are using balanced input amplifiers, you can use ÔstereoÕ plugs to
connect to your amplifiers. When using single ended input amplifiers, use a ÔmonoÕ style plug
and this will ground out the unused output as needed.
Line Out
(LEFT)
R- T+ S
gnd
Amp
}
Balanced Output
T+ S
gnd Amp
}
Unbalanced Output
Line Out
(RIGHT)
R- T+ S
gnd
Amp
}
Balanced Output
T+ S
gnd Amp
}
Unbalanced Output
G ILDERFLUKE & C O . ¥ 205 S OUTH F LOWER S T . ¥ B URBANK , C ALIF . 91502-2102 ¥ 818/840-9484 ¥ FAX 818/840-9485
22 of 92
21 As there is no user wiring to this connector, the function of each wire is documented in the ap-
pendix at the end of this manual rather than here.