Datasheet

Contact Closures & Paging Ports
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 trigger
threshold keeps noise from falsely trigger-
ing the paging equipment, and the ad-
justable release delay (up to 25 seconds)
keeps the paging system from dropping
out in the middle of a page.
Low Cost Microphone Pre-Amp
The VAR1’s built-in microphone pre-amp is
a low cost and convenient device to use
when a single channel of microphone pre-
amplification is needed. Designed for
balanced, low-impedance dynamic micro-
phones, the VAR1 contains a MIC level
control.
Accessories
Accessories
Product Features:
• Two sets of C-Form (both N.O. and N.C.) relay contacts
respond to audio activity
• 4 levels of input signals: microphone, 600-ohm line, 25V,
and 70V speaker systems
• Built-in balanced, low noise, high gain microphone pre-amp
• A 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
VAR1
PRS40C
12V DC Power
Supply
Power Product
Requirements Dimensions Weight
1 lb.
External 12V to
24V DC @ 100 mA
(not included)
5-3/8" W x 3-7/8" H
x 1-3/8" D
TBA15
Product Features:
• Hands-free 2-way conversations through the
paging system
• 15 watts of speaker power
• Works on 25V and 70V speaker systems
• Adjustable switching sensitivity control for
switching from listen to talk
• Adjustable switch-back delay prevents
chopping of pages and provides smooth
2-way conversations
• Talk Back and page volume controls
• Mute input forces amplifier into page mode
• Wall or 19" rack mount
• Perfect accessory for zone paging
applications
• No moving parts for high reliability
• Resettable circuit breaker
w/ thermal protection
* Page port connection should be a duplex line for
talk back applications.
The TBA15 is a unique amplifier that permits loudspeakers to be used as microphones to
provide hands-free, two-way conversations through the paging system*. In the idle state,
the TBA15 uses the attached speakers as microphones and feeds this signal out to a tele-
phone line. When the TBA15 senses a paging signal on the telephone line, it will switch on
its 15W amplifier and use the speakers conventionally.
TAMB2
Telephone
Access Module
ZPM3
Zone Paging
Module
Power Product
Requirements Dimensions Weight
120V AC 1 9" W x 5- 1 /4" H x 2-5/8" D 7 lb.
Applications
The TBA15 is an ideal complement to the
ZPM3 (see page 36) for hands-free talk back
in specific areas. Here are a few examples:
Stock Rooms: A large stock area can be
paged with a question on availability and the
stock clerk can simply shout back the answer,
no matter where he/she is or what he/she is
doing.
Commercial Kitchens: Allows hands-free
communications between cooks and wait
staff. This keeps the cook’s hands off the tele-
phone and on the meal, which is more sani-
tary and more efficient.
Security: This is a perfect way to get audio
surveillance of remote areas. Simply dial up
the zone for an area and listen for activity...
even the tiniest sounds can be heard.
By adding speakers, a large area can be mon-
itored for activity. You can announce into
these same areas, too.
www.bogen.com
52
PAGING ELECTRONICS
VOICE-ACTIVATED RELAY
TALK BACK AMPLIFIER
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.
Can also be used as a balanced, low-impedance mic pre-amp.