Henry Engineering AutoSwitch

AutoSwitch can also be used to automatically switch to a “backup” audio source if the main source fails, loses a channel, or if the audio level drops below a pre-set threshold. Each of the two silence sensors (L & R) has adjustments for setting the silence threshold and delay time. If the main source level drops below the threshold for the time set, the silence sensor trips and the unit switches to the backup source. When the main source returns, the unit resets and switches back to the main source.

Henry Engineering AutoSwitch has an Alarm relay output to activate an external alarm or other equipment. LEDs indicate which audio source is active, when either channel’s audio is below the silence threshold, and when the silence sensor has tripped. The silence sensors can be disabled (for manual control), as can the Alarm relay (with automatic audio control still active). Electronic audio switching creates a smooth transition between sources. Gain trims are provided for precise adjustment of audio levels.

AutoSwitch uses plug-in euroblock connectors for audio and control interface. The unit is 1/3 rack width and can be rack-mounted with the optional rack-mount shelf, or cabinet or wall mounted using optional cabinet/wall mounting brackets. AutoSwitch is powered with a built-in AC power supply.

Typical application

3 Optional mounting solutions are available
• Rack mount shelf
• Desk mount
• Wall/Cabinet mounting brackets

Specifications
• Input Level -10 to +4 dBu
• Input Impedance 10K ohms bal, 5K ohms unbal
• Output Level +4 dBu nominal, +24 dBu max
• Output Impedance 600 ohms or higher per chan, bal
• Gain -6 to +6 dB
• Frequency Response DC-20 kHz, +/- 0.25 dB
• Distortion <.01% IM/THD
• Noise >90 dB below +4 dBu output
• Manual Control Input Maintained contact closure or 5-24 VDC
• Silence Sense Level 10 to 40 dB below normal level
• Alarm Time Delay 3 – 35 seconds in two ranges
• Alarm Relay Output Dry contacts, SPDT, 24 VDC, 1 A max.
• Power Requirement 115/230 VAC, 50-60 Hz, 3W
• Approval City of Los Angeles Elect. Test Lab
• Construction Steel enclosure
• Physical 5.75”w X 5.50”d X 1.60”h, 3 LBS