User Manual for the
Contents
1. User Guide for the Silence Sense JR Silence Sense Detector Version 2 2 DM Engineering 2174 Chandler St Camarillo CA 93010 805 987 7881 800 249 0487 www DMEngineering com Theory of Operation The Silence Sense Jr is a microprocessor based device that senses the presence of audio from a single ended input over a wide range of input levels A user adjustable input control and a yellow LED indicator are used to set the input sensitivity When the audio input ceases for a predetermined user selectable period 1 min or 4 min maximum timeout depending upon the internal jumper setting a set of normally open relay contacts are closed These contacts may be momentary or continuous depending on user switch selection An internal jumper may be installed to change the relay output to normally closed contacts if desired A red LED indicator signals when the preset time period has been exceeded and remains on until audio is firmly reestablished The reapplication of audio automatically resets the device Power for the device is supplied by a wall wart power supply Either polarity power supply output is acceptable as the unit employs Power Guard which steers the proper polarity to the Silence Sense Jr Battery back up 9V is provided to assure operation when the power fails Both external and battery back up power are disconnected when the power switch is in the off position Connections 1 2 Setup 1 2 Audio2. input A single ended audio source is attached to the Eurostyle style connecior positive and ground inputs Observe polarity Relay output Eurostyle type screw terminal Normally Open rated at 2 A This connection goes in series with the indicator sounder or other circuit desired Normally Closed is available see section 4 in Setup Power input With the Silence Sense Jr power switch in the off position connect the wall wart DC output connector to the power input jack on the front of the unit Plug the wall wart into a convenient 117VAC outlet Battery back up Remove the bottom battery compartment door by pressing down and outward on the door when viewed from the bottom Locate the battery that was shipped with the unit and connect the battery to the snap on battery connector in the compartment and replace the door With audio present at the input set the power switch to the on position Slowly adjust the gain adjust control in the clockwise direction until the yellow LED glows at full brilliance at low audio passages Depending on your programming this level may need to be readjusted for reliable audio detection later Adjust the duration set control to the desired timeout period Fully counter clockwise Is approximately 3 5 seconds mid setting is 30 seconds 2 min and fully clockwise is approximately 60 seconds approximately 4 min You may set the control to any position desired Note that after the adju
3. lence Sense Jr should continue to function normally That s it the Silence Sense Jr is now ready and waiting to monitor your audio Hints Most programming has pauses from time to time that may last for 30 seconds or more especially if you are broadcasting Sunday morning church services Experience has taught that 45 60 seconds is the best selection if you dont want to receive false alarms Also take time in setting the input levels Wait and watch the yellow LED through different types of programming or selections of music and speech to assure that the sensitivity is set correctly Specifications e Input Impedance 10K ohms minimum single ended Eurostyle terminal block connector e Input Level 30 to 10 dom input adjustable e Silence Detect Time 3 60 seconds or 5 seconds to 4 min approx user adjustable e Output Normally open single pole relay contacts 2 A rating 30 VDC 1 second momentary or continuous closure switch selectable Eurostyle terminal block connector output e Power Requirements Supplied adapter 115 VAC to 9 12 VDC 100 500 ma e Battery Back up Requirements 9 VDC alkaline battery NEDA 1604A Supplied e Size 4 4 x 2 6 x 1 1 e Shipping Weight Approximately 2 Ibs
4. stment is made it is recommended that the audio input be momentarily turned off and back on to reset the microprocessor This is true any time the duration set adjustment is changed The red LED will signify when the timeout period has been reached 3 The Silence Sense Jr is supplied set for a 4 minute maximum timeout period as a default value unless otherwise requested at the time of order To set the unit to one minute remove the 4 rubber feet that are hiding the access screws on the bottom of the cabined Remove the top cover and locate the Timeout jumper J1 and move it to the 1 position See figure 1 below Fig 1 4 To change the relay contacts to Normally Closed open the cabinet as instructed in step 3 and cut the wire jumper marked NO Insert and solder another wire jumper in the NC position or in later versions move the jumper from the NO position to the NC position See figure 2 Fig 2 5 Select momentary M or continuous C relay operation using the relay output selector switch See figure 3 e Ejen Fig 3 Operation and test To test the Silence Sense Jr remove the audio input and wait for the red LED and relay to activate This will be the actual delay time and may be reset at will Remember to momentarily remove audio to reset the microprocessor each time this adjustment is changed To test the battery back up operation simply disconnect the external power The Si
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