VOICE-ACTIVATED RELAY
VAR1
DESCRIPTION
The VAR
1
Voice-Activated Relay is a DPDT relay device
that is activated when an audio signal is detected at the
microphone pre-amp or at 70V, 25V, or 600-ohm line level
inputs. It has a number of useful applications, such as mut-
ing a sound system in response to a microphone or tele-
phone page, activation of accessory (security) equipment,
or activation of a zone paging module.
A slide switch is included to select the pre-amp or the
line inputs. The VOX detect circuit also includes volume,
sensitivity, and delay controls. The audio output is an iso-
lated 600-ohm transformer.The unit operates from a DC
power source (not included).
INSTALLATION
Set input source switch on the top side of the unit to
LINE if using one of the line inputs or to MIC if using
a microphone.
Connect a power supply to the
1
2-24V DC jack on the
top of the unit or to the + and - screw terminals. The
Bogen model PRS40C power supply is recommended.
WIRING
Refer to the block diagrams and the sample wiring diagrams
on the next page to wire the VAR
1
for your application.
OPERATION
Sensitivity can be adjusted according to the needs of the
application. Clockwise rotation of the control increases
sensitivity. Do not over rotate the control or you may
damage the trimpot.
The delay control is also adjustable in the field.The max-
imum delay time is 25 seconds. Clockwise rotation of the
control increases delay time.
Printed in Korea 0309
©2003 Bogen Communications, Inc.
54-5934-01B
Specifications subject to change without notice.
50 Spring Street, Ramsey, NJ 07446 U.S.A.
201-934-8500; FAX: 201-934-9832
www.bogen.com
SPECIFICATIONS
LINE INPUT
Impedance: 600 ohms
Frequency Response:
1
00 Hz to
1
0 kHz
70V Input Impedance: 200k ohms
Output Level: 400 m VRMS
25V Input Impedance: 75k ohms
Output Level: 420 m VRMS
MIC PREAMP
Gain: 62 dB
Sensitivity: 750 microvolts, rms for
1
VRMS out
Distortion: <2%
Frequency Response: 200 Hz to
1
0 kHz
Output Signal-to-Noise Ratio: 55 dB
VOX Sensitivity: 20 mV -
1
50 m VRMS
@ 600 ohms Line input
Time Delay Range (approx.): 0.25 to 25 sec.
Relay Contact Rating: 2 amps/30 VDC,
0.5 amp./
1
20 VAC
SERVICE
There are no user serviceable components within the
VAR
1
.The warranty may become void if the unit is serv-
iced by other than an authorized Bogen service agency.
Contact the Bogen Applications Department if you have
any questions concerning VAR
1
applications.
