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Input preamp schematic
Nominal Input Level
(-)62dBm to (-)22dBm
22uF , 63V
6.8k
Mic
22uF
63V
Audio
100
+48
VDC
Input
6.8k
22uF , 63V
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
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
Rf = trimpot + 10 ohms
Rf = 10 then Av= 1000 (60dB)
Rf = 1000 then Av= 10 (20dB)
1.0k
10 ohms
12V
1
2
_
8
10k
12V
2019
6
150pF
U1
3
4
12V
+
10k
7
(-)12V
12V
+12V
2.2k
0.047uF
+12V
1
9
4049
10
1 1
4049
12
U5D
U5E
9
4049
8
U6D
100k
0.47uF
PGM
15
4049
14
U5F
1.0k
+12V
Mic Channels 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
Btm
1
10K
2 1 1 2
47uF
10pFF
+
47uF
40.2K
6
_
+
5532
10K
U2B
5
+
(-)5V
10k
2.2k
0.047uF
10
12
1 1
4049
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
3
1
ctrl
+
Y
4
CD4053
8
X/Y
U4B
10K
5
6
X
inh
Vee
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
2.2k
10k
0.047uF
10
1 1
12
4049
7
U7E
4049
U7C
100k
0.47uF
CUE
15
14
4049
U7F
1.0k
+12V
Arrakis Systems
1.22
Mic Talkback
to Studio
Pgm L
Aud L
Audio bus
Pgm R
Aud R
6.81K
6.81K
6.81K
CR Mute 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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