RDL STDA3 Specifications

STICK-ON® SERIES

Model ST-DA3
Distribution Amplifier

ANYWHERE YOU NEED...

• Audio Distribution with Up To 3 Outputs

• Balanced or Unbalanced Input and Outputs

• To Bridge a Line for Local Distribution

• Distribution with Impedance Conversion

• Distribution with Gain or Loss

• Ground-referenced or Floating Power

You Need The ST-DA3!

The ST-DA3 is part of the group of versatile STICK-ON products from Radio Design Labs, featuring the
advanced circuitry for which RDL products are known. The durable adhesives provided with the ST-DA3
permit permanent or detachable mounting. Numerous mounting accessories, brackets and rack-mount
chassis are optionally available to facilitate any system design.

APPLICATION: The ST-DA3 allows the bridging of any audio line, adjustment of the gain, and driving up
to three outputs. Each output is driven by a separate amplifier, and is isolated from both the input and
from the other outputs. The circuit design allows the input to accept either balanced or unbalanced
signals, of either high or low impedance; and each output may be connected either balanced or
unbalanced. The ST-DA3 features wideband circuitry that produces the unsurpassed pure clarity for
which RDL products are known. Some features are:

• Functions as an electronic transformer

• Provides isolation, gain, and three outputs

• Wideband amplifiers produce impeccable audio

• Operates from ground-referenced, floating or bipolar power supply

• Ultra-low distortion

• Ultra-low noise

• Excellent phase response

• Gain adjustment 17 dB above or below unity

• Ample headroom at operating level

• Recessed multi-turn audio taper gain trimmer for precise control

• Input and outputs are RF protected

• Full operation in either high or low impedance circuits

• Outputs are short circuit protected

• Positive connections via barrier block

Wherever an audio distribution amplifier is needed, the ST-DA3 is the ideal choice. Use the ST-DA3
combined with other RDL RACK-UP®, STICK-ON, TX™, or FLAT-PAK™, RCX™ series products as part
of a complete audio/video system.

RDL • P.O. Box 1286 • Carpinteria, CA., USA 93014 • [phone] • FAX [phone] • http://www.rdlnet.com

STICK-ON® SERIES

Model ST-DA3
Distribution Amplifier

AUDIO DISTRIBUTION AMPLIFIER

G
A

I

N

SIGNAL

FROM

BALANCED

LINE-LEVEL

SOURCE

INPUT

LINE LEVEL BALANCED OR UNBALANCED

OUTPUTS

1 2 3

SIGNAL

FEEDING

BALANCED

LINE-LEVEL

EQUIPMENT

OTHER

BALANCED

OR UNBAL

OUTPUTS

PWR

P
O
W
E
R

U

AUDIO

WIRING

25 TURN

GAIN SET

ADJUSTMENT

Installation/Operation

EN55103-1 E1-E5; EN55103-2 E1-E4

Typical Performance reflects product at publication time
exclusive of EMC data, if any, supplied with product.
Specifications are subject to change without notice.

AUDIO DISTRIBUTION AMPLIFIER

G

INPUT

A

I

N

SIGNAL

FROM

UNBALANCED

LINE-LEVEL

SOURCE

LINE LEVEL BALANCED OR UNBALANCED

OUTPUTS

1 2 3

SIGNAL

FEEDING

UNBALANCED

LINE-LEVEL

EQUIPMENT

OTHER

BALANCED

OR UNBAL

OUTPUTS

PWR

P
O
W
E
R

U

SUPPLY

P
O
W
E
R

WIRING

FOR FLOATING

OR BIPOLAR

INSTALLATION

FOR GROUND-

REFERENCED

INSTALLATION

AUDIO DISTRIBUTION AMPLIFIER

LINE LEVEL BALANCED OR UNBALANCED

G

INPUT

A

I

N

OUTPUTS

1 2 3

PWR

U

OPTIONAL

(WHEN USING GROUND-REFERENCED POWER SUPPLY)

RDL PS-24

TYPE

SUPPLY

TYPICAL PERFORMANCE

Input: 20 kΩ balanced or unbalanced
Input Signal: -15 dBV to +21 dBu (for +4 dBu output)
Maximum Input Level: +24 dBu
Outputs (3): 150 Ω balanced or 75 Ω unbalanced
Output Signal:
Balanced: +4 dBu nominal
Unbalanced: 6 dB below balanced line-level
Maximum Output Level: +25 dBu
Frequency Response: 10 Hz to 100 kHz (+/- 0.05 dB)
THD+N: < 0.002% (unity gain)
Noise below +4 dBu: < -98 dB (unity gain)

891-0012N

JUMPER

24 Vdc

POWER

SOURCE

Radio Design Labs Technical Support Centers

U.S.A. [phone], [phone]; Fax: [phone]

Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287

DO NOT

GROUND

NEGATIVE

POWER

OR

GROUND

NEGATIVE

POWER

AUDIO DISTRIBUTION AMPLIFIER

LINE LEVEL BALANCED OR UNBALANCED

G

INPUT

A

I

N

AUXILIARY

BIPOLAR

SUPPLY

OUTPUTS

1 2 3

BIPOLAR SUPPLY

12

G

OR

N

15

D

Vdc

PWR

P
O

W

E
R

U

12

OR

15

Vdc

Headroom: > 20 dB (above +4 dBu)
IMD: < 0.003% (unity gain)
Gain: Unity +/- 17 dB (adjustable)
CMRR: > 60 dB (50 Hz to 120 Hz)
Indicator: Red LED power indicator
Power Requirement: 24 to 33 Vdc @ 70 mA,

Ground-referenced or Floating
Dimensions: Width: 3.00 in. 7.62 cm
Depth: 1.55 in. 3.94 cm
Height: 0.65 in. 1.65 cm