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Input preamp schematic
Left
(+4dBu =3.5VPtoP)
Balanced
+4 dBu
Stereo Audio
Input
Right
(+4dBu =3.5VPtoP)
Nominal Input Level & Trim Adjust
This input is designed to accept input levels from
(-)16dBu to +22dBu.
(-)16dBu in to
(+)22dBu in to
+5V
RS232 PC
Logic (PC channel)
3906
1.5K
Channel On = (+)5V
3.9K
22K
47K
Channel Off = (-)5V
3904
-5V
Remote Channel
On-off w Tally
ON
0.047uF
475
+12V
OFF
475
+12V
ON/OFF
1k
ON/OFF
22.1k
2N3904
+12V
Logic schematic
ARC Console
10K
10K
10pF
50K
100K
2
_
5532
1
U1A
3
(-2dBu = 1.7VPtoP)
+
10K
10K
100K
10K
10K
10pF
50K
100K
6
_
7
5532
U1A
5
(-2dBu = 1.7VPtoP)
+
10K
10K
100K
(-)2dBu out = 14dB gain
(-)2dBu out = (-)22dB atten.
dBu
VPtoP
-50
0.0069
-20
0.22
-10
0.69
-2
1.7
0
2.2
+4
3.5
+8
5.5
+10
7.0
+13
10.0
+19
20.0
+19.8
21.5
2.2k
0.047uF
+12V
1
9
10
1 1
12
4049
4049
U5D
U5E
9
8
4049
U6D
100k
0.47uF
PGM
15
4049
14
U5F
1.0k
+12V
+4dBu Balanced Stereo Input Channel Schematic
Fader & Bus Assignment schematic
Note on CD4053 Headroom
At +(-)5V Vdd and Vee, the CD4053
clips at +13dBU for 15dB of headroom
above the nominal (-)2dBU level.
(-2dBu)
47uF
10pF
(-14dBu)
+
47uF
40.2K
2
_
+
5532
10K
U2A
3
+
+5V
10K
4 3 3 4
Top
3
Fader
4 na
10K
1
Btm
2 1 1 2
47uF
10pFF
+
47uF
40.2K
6
_
+
5532
10K
U2B
5
+
(-)5V
2.2k
10k
0.047uF
10
1 1
4049
12
9
4049
U6E
U7D
100k
0.47uF
AUD
15
4049
14
U6F
1.0k
+12V
+5V
16
10K
11
13
Vdd
ctrl
Y
14
CD4053
X/Y
U4C
10K
12
6
X
inh
9
10K
3
ctrl
Y
(-2dBu)
4
CD4053
X/Y
U3B
5
6
X
inh
Vss
10K
8
47uF
10K
9
1
3
ctrl
+
Y
4
CD4053
8
X/Y
U4B
10K
5
6
X
Vee
inh
10K
7
(-)5V
Fader in hand
2
= -12dB
10
10K
1
ctrl
Y
15
CD4053
X/Y
U3A
2
6
X
inh
10K
47uF
10K
10
1
7
ctrl
+
Y
15
CD4053
4
X/Y
U4A
10K
2
6
X
inh
Vee
10K
7
(-)5V
Note on CD4053 Control
Ctrl = 1 then Y = on, X = off
Ctrl = 0 then X = on, Y = off
10k
2.2k
0.047uF
10
1 1
4049
12
U7E
7
4049
U7C
100k
0.47uF
CUE
15
4049
14
U7F
1.0k
+12V
Arrakis Systems
1.24
Cue
Pgm L
Aud L
Audio bus
Pgm R
Aud R
6.81K
6.81K
6.81K
Autocue bus
10k
2.2k
6
5
4
4049
U7B
100k
0.47uF
2
3
4049
U7A
1.0k
Rev A
8/21/2007
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