Bogen VAR1 Voice Activated Relay for 70V Paging System 2 Sets of C Form The VAR1 is a relay device that monitors audio activity over a wide range of input voltages and operates two sets of C-Form relay contacts in response to detected activity. The VAR1 can be used to detect voltages as low as signals directly from a microphone or as high as signals from 70V speaker systems. A low-level output of the detected audio, transformer-isolated from the input, is also made available for use with other equipment. The VAR1 can also be used as a balanced, low-impedance microphone pre-amp. The VAR1 is ideally suited to provide a set of contact closures for paging ports of lower cost telephone systems that do not have a set of AUX contacts to trigger paging equipment. An adjustable release delay (up to 25 seconds) keeps the paging system from dropping out in the middle of a page. Features: Monitors audio activity over a wide range of input voltages Two sets of C-Form (both N.O. and N. C.) relay contacts respond to audio activity Four levels of signals: microphone, 600-ohm line, 25V, and 70V speaker systems Built-in balanced, low noise, high gain microphone pre-amp Transformer-isolated, 600-ohm small signal level output of detected audio available Works with self-amplified or central-amplified paging systems Separate microphone pre-amp gain control Adjustable release delay: 0.25s to 25s Trigger threshold adjustment Relay active indicator light Accessories: PRS40C 12V DC Power Supply (sold separately) Specifications: LINE INPUT Impedance: 600 ohms Frequency Response: 100 Hz to 10 kHz 70V Input Impedance: 200k ohms Output Level: 400 mVrms 25V Input Impedance: 75k ohms Output Level: 420 mVrms MIC PRE-AMP Gain: 62 dB Sensitivity: 750 microvolts, rms for 1Vrms out Distortion: 2% Frequency Response: 200 Hz to 10 kHz Output Signal-to-Noise Ratio: 55 dB GENERAL VOX Sensitivity: 20 mV to 150 mVrms @ 600 ohms Line input Time Delay Range (approx.): 0.25 to 25 sec. Relay Contact Rating: 2A/30V DC, 0.5A/120V AC Power Requirements: External 12V to 24V DC @ 100mA (sold separately) Dimensions: 5-3/8" W 3-7/8" H 1-3/8" D Product Weight: 1 lb.