Wheatstone TV-80, Technical Manual

Page: 74 / 120

V U / O S C I L L A T O R
page 7 – 2
TV80 / Sep 98
OSC
ON
8
0
9
7
6
5
4
3
2
1
0 1
ENABLE
8
0
9
7
6
5
4
3
2
1
0 1
TB
10KHz
5KHz
1KHz
400Hz
40Hz
INPUTS
MXM
AUX SNDS
SUBS
MSTRS
F
R
E
Q
U
E
N
C
Y
A
S
S
I
G
N
EXTERNAL
1 2
3 4
E
X
T
L
R
L
SOLO/EXT
SPARE
R
A
U
T
O
S
/
S
H
O
L
D
R
E
S
E
T
T
I
M
E
R
E
X
T
O
S
C
T
B
M
I
C
METER SELECT
SOLO/CUE
ACTIVATED
O
S
C
V
U
T
R
I
M
VO
VU / Oscillator Module
General
The TV-80 audio console VU/Oscillator (VO) module houses the
console’s talkback, oscillator, external meter and timer control circuits.
Module audio (and timer control) connections are made via two
DB-25 multi-pin connectors (“A” upper; “B” lower) located on the
back rear panel of the module. An upper DB-9 “TB” connector handles
talkback signals, and a lower DB-9 “Spare VU” connector handles
signals for the console’s spare VU meter driver circuitry (see page 7-
5).
Please refer to the signal flow diagram on page 79 of the Technical
Drawings in conjunction with the text of this chapter.
Module Controls
External Oscillator Enable
When activated this switch (with associated front panel XLR input
jack) substitutes an external oscillator signal for the module’s built-in
oscillator (via either the XLR jack OR the module’s oscillator in pins
on the rear panel lower DB-25 connector).
VU Trims
Recessed front panel trimpots for calibrating the console’s
meterbridge SOLO/EXT VU meters.
Talkback
The master level control for the console operator’s talkback micro-
phone. The signal comes from the associated front panel XLR input
jack OR the module’s external talkback input pins on the rear panel
upper DB-9 (“TB/OSC”) connector. Note phantom power is present at
both talkback inputs.