ST-SSR1 RADIO DESIGN LABS, ST-SSR1 Datasheet
ST-SSR1
Manufacturer Part Number
ST-SSR1
Description
RDL SOLID STATE AUDIO RELAY, FREQUENCY RESPONSE: 20 HZ-23 KHZ, POWER REQUIREMENTS: 24-33 VDC, 40 MA, FEATURES: PROVIDES ABSOLUTELY SILENT SWITCHING OF TWO LINE LEVEL AUDIO SIGNALS, SELECTABLE FAST/SLOW SWITCHING PROVIDES SOFT CONTROL
Manufacturer
RADIO DESIGN LABS
Datasheet
1.ST-SSR1.pdf
(2 pages)
STICK-ON
Model ST-SSR1
Solid-State Audio Relay
ANYWHERE YOU NEED...
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You Need ST-SSR1!
The ST-SSR1 is part of a group of products in the STICK-ON series from Radio Design Labs. The durable
bottom adhesive permits quick, permanent or removable mounting nearly anywhere or it may be used with
RDL’s racking accessories. The ST-SSR1 offers the ultimate in totally solid-state audio switching, with the
big PLUS, you can put it right where you need it!
APPLICATION: The ST-SSR1 has two line-level audio inputs and a single, line-level audio output. In the
absence of a control input, the NORMAL audio input feeds the module output. When the TRIG control
terminal is pulled to ground, the SELECT input is switched to the output and the NORMAL input is
switched off. When the TRIG terminal is again allowed to go HI, then the SELECT input is turned off and
the NORMAL input is switched to the output. The module contains no mechanical relays or other devices.
The audio inputs are applied to a low-noise preamplifier. The control circuits utilize solid-state switching to
apply one of the input signals to the balanced output line driver with OFF attenuation better than 80 dB at
all audio frequencies!
The ST-SSR1 has user-selectable switching rates. The module can be used in muting applications where
audio must be switched off extremely fast. This could be required to prevent feedback in automatic
microphone mixing installations. For muting, the audio source is connected to the NORMAL input, and
the ST-SSR1 is used to turn this line off. In this mode, the audio off-time switching is accomplished in
less than 100 microseconds. Although necessary in some circumstances, this fast switching transition can
sound harsh to the ear and would be undesirable where the module is being used to select inputs to a
high power amplifier or in high quality studio applications. Installation of a jumper between the SOFT
terminal and GROUND slows the switching transition by implementing a soft knee, ramping the audio to
the on or off condition. This still sounds instant to the ear, but is slowed sufficiently to remove any
unpleasant edge from the switch transition. For most applications, the module is used in the SOFT mode.
The control current required at the TRIG terminal is so minimal (< 0.5 mA) that the ST-SSR1 can be
controlled from nearly any source, from switches to logic circuits. The TRIG input feeds a comparitor,
which switches at a threshold of 2 volts, permitting open-collector switching, or switching directly from
circuits operating from a 5 volt supply! The exceptional low noise and low distortion performance of the
ST-SSR1 makes it the ideal choice for noiseless line-level audio switching in both sound system or
recording installations.
FLAT-PAK™ series products as part of a complete audio/video system.
To Switch Line Level Sources
To Select Between Two Balanced Lines
Silent Audio Switching
Audio Switching for Audio Muting
Fast Switching for Audio Muting
Switching by Open Collector Logic
RDL
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659 N. 6
®
th
SERIES
St.
Used in conjunction with other RDL RACK-UP
•
Prescott, AZ., USA 86301
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(928) 443-9391
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FAX (928) 443-9392
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www.rdlnet.com
®
, STICK-ON, TX™, or
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ST-SSR1 Summary of contents
Page 1
... Switching by Open Collector Logic You Need ST-SSR1! The ST-SSR1 is part of a group of products in the STICK-ON series from Radio Design Labs. The durable bottom adhesive permits quick, permanent or removable mounting nearly anywhere or it may be used with RDL’s racking accessories. The ST-SSR1 offers the ultimate in totally solid-state audio switching, with the big PLUS, you can put it right where you need it! APPLICATION: The ST-SSR1 has two line-level audio inputs and a single, line-level audio output ...
Page 2
... STICK-ON ® SERIES Model ST-SSR1 Solid State Relay SOLID STATE RELAY LINE LEVEL AUDIO SWITCH T S INPUTS POWER R O NORMAL SELECT SIGNAL SIGNAL FROM FROM BALANCED BALANCED LINE-LEVEL LINE-LEVEL SOURCE SOURCE SOLID STATE RELAY LINE LEVEL AUDIO SWITCH T S INPUTS POWER ...