Transcript
U.S.D.A. 2X4
TM
UTILITY SUMMING & DISTRIBUTION AMPLIFIER
HENRY ENGINEERING 503 Key Vista Drive Sierra Madre, CA 91024 Tel: 626.355.3656 Fax: 626.355.0077 www.henryeng.com
DESCRIPTION USDA 2X4 is a 2-in/4-out audio distribution amplifier that has the unique ability to combine as well as "split" audio signals for distribution. The unit has two inputs (one stereo pair) and four outputs (two stereo pairs). USDA 2X4 can be used as a 1X4 or 2X4 DA and can combine a stereo input to a mono output(s) without degrading the separation of the stereo source signal. All inputs are 20K bridging balanced; each output can drive a 600 ohm load to +26 dBm. An output level adjustment is provided for each output channel. Overall gain is adjustable from -12 to +14 dB. Nominal input levels between -10 and +8 dBm are recommended. All USDA 2X4 circuitry is active and direct-coupled. INSTALLATION All audio connections are via the plug-in euroblocks. Remove about 1/8” of insulation, insert wires into the plug, and tighten the screws. Be sure that no bare wiring is exposed. Connect input signals to the USDA inputs, labeled "1" and "2". For unbalanced inputs, install a jumper between the - input and GND. Single (mono) inputs may be fed to all 4 output channels by connecting both 1 and 2 inputs in parallel. Connect output loads to USDA outputs, labeled 1 through 4. For unbalanced loads, connect to the + and GND terminals only. (Do not connect the - terminal to ground.) It is not necessary to terminate unused outputs. OPERATION The signal fed to input 1 will appear at outputs 1 and 3. The signal fed to input 2 will appear at outputs 2 and 4. Hence, outputs 1 and 2 are a Left/Right stereo pair, as are 3 and 4. Each stereo output pair has a STEREO-MONO SWITCH. If the switch is in the "S" position, a stereo input will produce a stereo output. If the switch is in the "M" position, that output will be combined to monaural. The two stereo outputs operate independently; switching one output pair to MONO has no effect on the other pair, and does not degrade the separation of the stereo input signal. Each output has a gain adjustment for setting output level. A maximum of +8dBm (average) is recommended. Input levels should be between -10 and +8 dBm. For input levels outside of this range, consult the factory. SPECIFICATIONS Input impedance Input levels Gain S/N ratio Output source Z Output load Output level
20K ohms balanced; 10K ohms unbalanced -10 dBm to +8 dBm nominal -6 db to +15 db 100 dB, ref +4 dBm output w/ unity gain 100 ohms balanced; 50 ohms unbalanced 600 ohms or more per output, X4 +24 dBm max
Specifications subject to change without notice. P/N 3310 Rev. 6/04.
A
B
C
D
E2
E5
E4 GROUND TIE
AC
BLK
F1
C4 .001uF
C2 .001uF
C25 .01uF
WHT
5
115V: 250 ma; 230V: 125ma
AC E1
GND 6
GND 3 + 4 RIGHT 2 - 5
+ 1 LEFT 1 - 2
J1
E8
+15V
-15V 1
T1
8
6 7
D4 1N4004
5 SEC
RP1D U1A 2.2K DIP NE5532
3
2
RP1E 2.2K DIP 5 12
SPW-061
4
+15V
-15V 7
RP1A U1B 2.2K DIP NE5532
5
6
RP1B 2.2K DIP 2 15
4
RP1C RP2A 2.2K DIP 2.2K DIP 3 14 1 16
SW1
D3 1N4004
D2 1N4004
4
RP3A 2.2K DIP 1 16
+
C11 330uF 25V
D1 1N4004
+
C12 330uF 25V
LED
LED1
3.9K, 5%
R41
RP1F 2.2K DIP 6 11
BIPOLAR POWER SUPPLY
E9
2 3
1 PRI E7 230V E6
R7 4.99K C5 .001uF
R6 4.99K
C3 .001uF
R3 4.99K
R1 4.99K
1
16
4
13
4
8
4
2
3
INPUTS
5
2
3
IN
Q2
IN
Q1
5
6
3
2
+15V
-15V 1
4
LM7815
+15V
-15V 7
LM7915 OUT
U3A NE5532
C13 100pF
3
3
1
3
C8 .1uF
C10 .1uF
C9 .1uF
3
C16 .1uF
C15 .1uF
R22 47
R20 47
R15 47
R13 47
C7 .1uF
U3B NE5532
C14 .001uF
RP3D 4 13 2.2K DIP
RP3C 2.2K DIP 3 14
+15V
OUT
U2B NE5532
C6 .001uF
U2A NE5532
25K, POT
-15V 1
1
R38
+15V
-15V 7
13 2.2K DIP
RP2D
3
C1 100pF
25K, POT
R37 1
RP2C 2.2K DIP 3 14
RP3B 2.2K DIP 15 2
5
6
3
2
RP2B 2.2K DIP 15 2
GND 2
+
-
115V
8 4 8
+
-
+
-
8
4 +
-
1
4 8 4 8
+
-
GND
2 2
C18 .1uF
C17 .1uF
TP2
6
5
4
3
2
1
J2
C20 .1uF
C19 .1uF
TP3
-15V
TP1
+15V
GND
+ 2 RIGHT -
GND
+ 1 LEFT -
OUTPUTS
2
RP1G RP2E 2.2K DIP 2.2K DIP 7 10 5 12
RP1H 2.2K DIP 8 9
SW2
2 3
+
-
1
1 1
2
RP3E 2.2K DIP 5 12
+15V
-15V 7 U4B NE5532
C22 .001uF
RP2H 8 9 2.2K DIP
RP2G 2.2K DIP 7 10
U4A NE5532
+15V
C21 100pF -15V 1
3
5
6
3
2
8
B Date:
Size
Title
6
5
4
3
2
1
J3
GND
Monday, November 03, 2003
1
Sheet
1
telephone - (626) 355-3656 FAX (626) 355-0077
503 Key Vista Drive Sierra Madre, CA 91024 USA
HENRY ENGINEERING
of
1
A
Rev
+ 4 RIGHT -
GND
+ 3 LEFT -
OUTPUTS
1. ALL RESISTORS ARE 1/4W, 1%.
Document Number
3310
1
NOTE: UNLESS OTHERWISE SPECIFIED
R36 47
R34 47
R29 47
R27 47
SCHEMATIC: USDA 2X4
U5B NE5532
+15V
-15V 7
C24 .001uF
9 2.2K DIP
RP3H
RP3G 2.2K DIP 7 10
U5A NE5532
+15V
C23 100pF -15V 1
RP3F R40 2.2K DIP 6 11 1 3 25K, POT
5
6
3
2
25K, POT
RP2F R39 2.2K DIP 6 11 1
8 4 8
+
-
1
4 +
-
1
4 8 4 +
-
8
2 2
+
-
A
B
C
D
