RDL STSSR1

ST-SSR1

OUR PART #:  STSSR1 Write the First Review.

Our Price: $113.60
List Price: $151.95
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Radio Design Labs' ST-SSR1 is part of a group of products in the STICK-ON series from Radio Design Labs.
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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.

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 to turn off: Fast- 10 µs, Slow- 5 ms
    • * Time required for NORMAL input to turn on: Fast- 15 µs, Slow- 70 ms
    • * Time required 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 into bridging 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

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.

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