The ST-VOX1 is an Audio Controlled Relay in the STICK-ON series. When used in intercom or talkback applications, the ST-VOX1 may be triggered directly from an unbalanced microphone. In many such installations the microphone or other audio source must be preamplified, making the ST-VOX1 an ideal mate to work with the STM-1 preamp. The unbalanced output from the STM-1 can be used to trigger the ST-VOX1, while the STM-1 balanced output is used for the audio feed.
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Features:
- Switching Controlled by Voice Signal
- Switching from Mic or Line Level Signals
- Precise Threshold Adjustment
- DPDT Switching Contacts
- Open-Collector SLAVE Output
In many such installations the microphone or other audio source must be preamplified, making the ST-VOX1 an ideal mate to work with the STM-1 preamp. The unbalanced output from the STM-1 can be used to trigger the ST-VOX1, while the STM-1 balanced output is used for the audio feed.
APPLICATION:
The ST-VOX1 is an audio controlled relay in the group of STICK-ON series products by Radio Design Labs. These products are designed for quick, convenient installation and reliable operation in a variety of control applications. The ST-VOX1 is specifically designed to switch reliably on voice signals.
The unbalanced output from the STM-1 can be used to trigger the ST-VOX1, while the STM-1 balanced output is used for the audio feed. The ST-VOX1 releases very quickly, but holds on through very short pauses in syllables common to speech. These time constants allow the design of a communications system yielding comfortable two-way conversation.
High-impedance inputs connect across any unbalanced audio line; Multi-turn sensitivity adjustment permits precise threshold setting; Multi-turn DELAY control adjusts relay release delay; Tight bandpass filtering yields triggering on voice frequencies; Slave open-collector terminal allows additional relays to be added for more contacts (RDL’s ST-LCR1); Slave terminal may be used with remote switch to manually override the control circuit and turn on the relay