Protech Audio 517B - Manual

PROTECH
MODELS COVERED
The Model 517B Notch Filter Card is designed
for use in professional audio applications, which
require constant, automatic supervision of audio
equipment and circuits.
The Model 517B Notch Filter is used in conjunc-
tion with the Model 562B 25Hz Oscillator card
and the Model 685 Tone Supervisor card.
The Model 517B Notch Filter card is used to
remove any 25Hz content from program or page
material. The program material is fed thru the
notch filter card. The notch filter allows all of the
program material to pass thru, without distor-
tion, except the 25Hz content. The 25Hz content
is attenuated 50dB. This insures that no out-of-
phase 25Hz audio can cause false triggering at
the Model 685 Tone Supervisor card.
The Model 685 Tone Supervisor card is de-
signed to detect the presence of a 25Hz signal in
a complex audio program. If the 25Hz tone
should stop, or fall below a certain level, the
detector card will deactivate a relay, which is
wired to an alarm device. The Model 562B provides a constant level 25 Hz
signal at +4dBm. The frequency and level are
fixed via circuit design, in order to allow the
Model 562B to serve as both a signal source,
and a reference level. Typical applications are
multi-zone public address systems, intercoms,
paging systems, training systems, and monitor-
ing systems.
The actual application is found in buildings such
as airports, factories, courthouses, casinos, con-
vention centers, libraries, military facilities, race-
tracks, and corporate boardrooms.
The INTERGRA III card frame system also
features mixers, power amplifiers, remote level
controls, distribution amplifiers, and switching
cards, to facilitate complete system design. Ap-
plication notes showing typical system layouts
are available for all INTEGRA III modules.
For additional information, or applications assis-
tance, contact:
SALES ENGINEERING
517B
25 HERTZ NOTCH FILTER CARD
INSTALLATION & OPERATION MANUAL
®
517B
INTEGRA III SYSTEM
www. protechaudio .com
Model 517 Shown
1/06
Protech Audio Corporation, PO Box 597, 192 Cedar River Road, Indian Lake, New York, 12842, Voice 518-648-6410 Fax 518-648-6395