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Radio Design Labs ST-SSR1
Solid State 'Relay' Audio Switch

OUR PART #  STSSR1

Our Price: $109.86
List Price: $146.95
You save 25%! (Low Price Guarantee)
In Stock

Recommended Accessories

Radio Design Labs' 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 mounting nearly anywhere, or use it 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.

NOTE: Radio Design Labs' PS-24AS power supply is NOT included but is required in order to power this product.  Please see the "Accessories" tab or click here for more information on the PS-24AS power supply.

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 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 output 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 relay. The audio inputs are applied to a low-noise preamplifier. The control circuits utilize solid state switching to apply either of these signals to a balanced line driver.

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, typically, an input would only be connected to the NORMAL input, and the ST-SSR1 would be used to turn this line OFF. In this mode, the audio off-time switching is accomplished in <100 µs. Although necessary in some circumstances, this fast a switching transition can appear 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 and 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 feedsa comparator which switches with a threshold of 2 volts, permitting open-collector switching, or switching directly from circuits operating from a 5 volt supply!

Radio Design Labs ST-SSR1 Specifications:

  • Switching Time:
        * Time required for NORMAL input toturn off: Fast- 10 µs, Slow- 5 ms
        * Time required forNORMAL input to turn on: Fast- 15 µs, Slow- 70 ms
        * Timerequired for SELECT input to turn off: Fast- 15 µs, Slow- 10ms
        * Time required for SELECT input to turn on: Fast- 20µs, Slow- 35 ms
  • Control Signal: TRIG terminal must be externally pulled to ground
  • Control Current: 0.5 mA
  • Headroom:> 18 dB above +4 dBu
  • THD:< 0.030%
  • CMRR:> 55 dB (either input, 50, 60 or 120 Hz)
  • Freq. Response:
        * 10 Hz to 23 kHz (+/- 1/2 dB intobridging input)
        * 20 Hz to 23 kHz (+/- 1/2 dB into 600Ohms)
  • Noise:< -80 dB below +4 dBu unweighted, (-85 dB typ.)
  • ON Gain: Unity (nominal, either input into bridging load) -2 dB (into 600Ohm load)
  • OFF Attenuation:> 80 dB (either input, 10 Hz to 20 kHz)
  • Power Requirement: 24 to 33 Vdc @ 40 mA, Ground-referenced
Rackmount System for 12 Stick-On Units
Radio Design Labs STR-19A Rackmount System for 12 Stick-On Units
Radio Design Labs' STR-19A Racking System holds up to 12 STICK-ONs in a 19" rack and only occupies two rack spaces.
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Stick-On Mounting Rack for 10 Units
Radio Design Labs SR-10 Stick-On Mounting Rack for 10 Units
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24 VDC 500mA Switching Power Supply, North American Model
Radio Design Labs PS-24AS 24 VDC 500mA Switching Power Supply, North American Model
Radio Design Labs' PS-24AS is a 24 VDC/500 mA switching power supply with a North American AC plug. Compatible with various RDL products.Radio Design Labs PS-24AS Specifications: Input: 100 to 240 VAC Output: 24 Vdc, 500 mA (UL, ...
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Din Rail Adaptor for STICK-ON
Radio Design Labs DRA-35S Din Rail Adaptor for STICK-ON
The DRA-35S is a 35 mm DIN rail mounting bracket that provides positive mounting for any RDL STICK-ON® module. The oblique mounting angle of the DRA-35S allows an installer to mount several STICK-ON modules to a single DIN rail. Access to ...
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Radio Design Labs' STR-19B Racking System holds up to 10 STICK-ON unitss in a 19 inch rack and only occupies two rack spaces. The STR-19B holds STICK-ONs at an angle allowing for control adjustment from either the edge of a STICK-ON, or ...
162.53 217.40 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Free Shipping Available
Mounting Frame for Stick/TX
Radio Design Labs SR-4 Mounting Frame for Stick/TX
Radio Design Labs' SR-4 is a universal module chassis that can mount to a backboard, wall or nearly any other support. It provides mounting for 4 STICK-ON power amplifiers or 7 standard STICK-ON modules. TX ™ modules may also be mounted. ...
84.88 113.53 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
STICK-ON Series 19"W Mounting Rack for up to12 Modules
Radio Design Labs SR-12A STICK-ON Series 19"W Mounting Rack for up to12 Modules
Radio Design Labs' SR-12A chassis can be mounted in a rack or on a backboard to provide mounting of 12 STICK-ONs.
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Usually ships in 7-14 business days.
Need it sooner? Call us!
Mounting Bracket for up to 4 STICK-ON Modules
Radio Design Labs ST-PBR4 Mounting Bracket for up to 4 STICK-ON Modules
Radio Design Labs' ST-PBR4 is a mounting frame with slots for four STICK-ON modules.  The ST-PBR4 mounts on an FP-PSB1A power supply bracket or to any flat surface.  The ST-PBR4 design allows the installer to secure the modules ...
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32.87 38.78 15
Usually ships in 7-14 business days.
Need it sooner? Call us!
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Usually ships in 7-14 business days.
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Radio Design Labs ST-RRB1 Mounting Bracket for STICK-ON Modules
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22.67 26.74 15
Usually ships in 7-14 business days.
Need it sooner? Call us!
Detachable Terminal Block
Radio Design Labs Dtb Rdl Detachable Terminal Block
Use DTB's to quickly detach and reattach wiring harness to STICK-ON units.
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Usually ships in 7-14 business days.
Need it sooner? Call us!

Click to download

Radio Design Labs ST-SSR1
Solid State 'Relay' Audio Switch

OUR PART #  STSSR1

Product Information:

Radio Design Labs' 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 mounting nearly anywhere, or use it 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.

NOTE: Radio Design Labs' PS-24AS power supply is NOT included but is required in order to power this product.  Please see the "Accessories" tab or click here for more information on the PS-24AS power supply.

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 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 output 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 relay. The audio inputs are applied to a low-noise preamplifier. The control circuits utilize solid state switching to apply either of these signals to a balanced line driver.

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, typically, an input would only be connected to the NORMAL input, and the ST-SSR1 would be used to turn this line OFF. In this mode, the audio off-time switching is accomplished in <100 µs. Although necessary in some circumstances, this fast a switching transition can appear 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 and 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 feedsa comparator which switches with a threshold of 2 volts, permitting open-collector switching, or switching directly from circuits operating from a 5 volt supply!

Radio Design Labs ST-SSR1 Specifications:

  • Switching Time:
        * Time required for NORMAL input toturn off: Fast- 10 µs, Slow- 5 ms
        * Time required forNORMAL input to turn on: Fast- 15 µs, Slow- 70 ms
        * Timerequired for SELECT input to turn off: Fast- 15 µs, Slow- 10ms
        * Time required for SELECT input to turn on: Fast- 20µs, Slow- 35 ms
  • Control Signal: TRIG terminal must be externally pulled to ground
  • Control Current: 0.5 mA
  • Headroom:> 18 dB above +4 dBu
  • THD:< 0.030%
  • CMRR:> 55 dB (either input, 50, 60 or 120 Hz)
  • Freq. Response:
        * 10 Hz to 23 kHz (+/- 1/2 dB intobridging input)
        * 20 Hz to 23 kHz (+/- 1/2 dB into 600Ohms)
  • Noise:< -80 dB below +4 dBu unweighted, (-85 dB typ.)
  • ON Gain: Unity (nominal, either input into bridging load) -2 dB (into 600Ohm load)
  • OFF Attenuation:> 80 dB (either input, 10 Hz to 20 kHz)
  • Power Requirement: 24 to 33 Vdc @ 40 mA, Ground-referenced
Rackmount System for 12 Stick-On Units
Radio Design Labs STR-19A Rackmount System for 12 Stick-On Units
Radio Design Labs' STR-19A Racking System holds up to 12 STICK-ONs in a 19" rack and only occupies two rack spaces.
136.70 182.87 25
In Stock
Free Shipping Available
Stick-On Mounting Rack for 10 Units
Radio Design Labs SR-10 Stick-On Mounting Rack for 10 Units
Radio Design Labs' STR-10 Racking System holds up to 10 STICK-ON units.  It holds STICK-ONs at an angle allowing for control adjustment from either the edge of a STICK-ON, or the top (depending on where the adjustment is located on ...
65.41 87.48 25
In Stock
Free Shipping Available
24 VDC 500mA Switching Power Supply, North American Model
Radio Design Labs PS-24AS 24 VDC 500mA Switching Power Supply, North American Model
Radio Design Labs' PS-24AS is a 24 VDC/500 mA switching power supply with a North American AC plug. Compatible with various RDL products.Radio Design Labs PS-24AS Specifications: Input: 100 to 240 VAC Output: 24 Vdc, 500 mA (UL, ...
23.40 31.28 25
In Stock
Din Rail Adaptor for STICK-ON
Radio Design Labs DRA-35S Din Rail Adaptor for STICK-ON
The DRA-35S is a 35 mm DIN rail mounting bracket that provides positive mounting for any RDL STICK-ON® module. The oblique mounting angle of the DRA-35S allows an installer to mount several STICK-ON modules to a single DIN rail. Access to ...
19.40 22.89 15
In Stock
Mounting Kit for STICK-ON, TX, or Rack-Up module
Radio Design Labs MB1-RDL Mounting Kit for STICK-ON, TX, or Rack-Up module
Two mounting brackets mounts a STICK-ON, TX, or Rack-Up module to a flat surface.
3.46 4.08 15
In Stock
Rackmount Kit for 10 Stick-On Units
Radio Design Labs STR-19B Rackmount Kit for 10 Stick-On Units
Radio Design Labs' STR-19B Racking System holds up to 10 STICK-ON unitss in a 19 inch rack and only occupies two rack spaces. The STR-19B holds STICK-ONs at an angle allowing for control adjustment from either the edge of a STICK-ON, or ...
162.53 217.40 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Free Shipping Available
Mounting Frame for Stick/TX
Radio Design Labs SR-4 Mounting Frame for Stick/TX
Radio Design Labs' SR-4 is a universal module chassis that can mount to a backboard, wall or nearly any other support. It provides mounting for 4 STICK-ON power amplifiers or 7 standard STICK-ON modules. TX ™ modules may also be mounted. ...
84.88 113.53 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
STICK-ON Series 19"W Mounting Rack for up to12 Modules
Radio Design Labs SR-12A STICK-ON Series 19"W Mounting Rack for up to12 Modules
Radio Design Labs' SR-12A chassis can be mounted in a rack or on a backboard to provide mounting of 12 STICK-ONs.
65.41 87.48 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Mounting Bracket for up to 4 STICK-ON Modules
Radio Design Labs ST-PBR4 Mounting Bracket for up to 4 STICK-ON Modules
Radio Design Labs' ST-PBR4 is a mounting frame with slots for four STICK-ON modules.  The ST-PBR4 mounts on an FP-PSB1A power supply bracket or to any flat surface.  The ST-PBR4 design allows the installer to secure the modules ...
34.59 46.27 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
6 Stick-On DIN Rail Adapter Modules
Radio Design Labs DRA-35S-6 6 Stick-On DIN Rail Adapter Modules
Radio Design Labs' DRA-35S-6 is a 35 mm DIN rail mounting bracket that provides positive mounting for any RDL STICK-ON® module.  The oblique mounting angle of the DRA-35S allows an installer to mount several STICK-ON modules to a ...
32.87 38.78 15
Usually ships in 7-14 business days.
Need it sooner? Call us!
Mounting Strip for STICK-ON Units
Radio Design Labs Smk 12 Mounting Strip for STICK-ON Units
The SMK-12 allows removable surface (up to 6 units) or edge (typically 12, max. 16) mounting of STICK-ON units. They can be fastened to its surface using screws or adhesive foam pads.
28.01 37.45 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Mounting Bracket for STICK-ON Modules
Radio Design Labs ST-RRB1 Mounting Bracket for STICK-ON Modules
Radio Design Labs' ST-RRB1 mounting kit contains a bracket to attach a STICK-ON module to a rear rack rail or to any flat surface. The module slides into the holder and snaps into position. The module may easily be removed.
22.67 26.74 15
Usually ships in 7-14 business days.
Need it sooner? Call us!
Detachable Terminal Block
Radio Design Labs Dtb Rdl Detachable Terminal Block
Use DTB's to quickly detach and reattach wiring harness to STICK-ON units.
6.92 8.16 15
Usually ships in 7-14 business days.
Need it sooner? Call us!

Click to download

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