Protech Audio Corp., 192 Cedar River Road, Indian Lake New York, 12842 Voice 518-648-6410 Fax 518-648-6395
PROTECH
MODELS COVERED
The Models 546B (1KHz), and 562B (25Hz) Au-
dio Oscillator cards are designed for use in
professional applications. Typical applications
are multi-zone public address systems, emer-
gency communications systems, training sys-
tems, paging systems, and intercom systems.
The Model 546B is designed to provide a stable, low
distortion 1KHz reference signal for aligning systems,
or to provide audible signals or alarms.
The Model 562B is designed to provide a stable, low-
distortion signal for audio detection or supervision
sytems (See Model 685 Tone Supervisor Card). This
low frequency tone is usually not audible in sound
systems, but may be readily detected by the supervi-
sory card. This type of circuit is quite often found
in systems where crowd control, or emergency
communications are system requirements. The de-
tector circuit monitors the system circuits, and auto-
matically signals the failure of any component in the
system. This facilitates proper maintenance of the
audio system.
Both cards are designed to provide an adjustable -40
to 0dB signal level. The frequency is fixed, via circuit
design.
Both cards feature Bridge-T circuitry, in order to
provide extremely low distortion. The typical distortion
measurement is less than 0.01%. The low distortion
and constant output level are characteristic of this type
of circuit, and makes the oscillator cards ideal for use
as a reference signal when testing audio systems.
There are a number of INTEGRA III SYSTEM cards
available to help mix the audio signals into the audio
system. In the case of the 25HZ signal being used in
conjunction with the Model 685 Tone Supervisor Card,
mixing the signal into the system at the earliest pos-
sible point, will allow the supervisor card to monitor
more equipment.
As with all INTEGRA III SYSTEM cards, both the
Model 546B and 562B Oscillators Cards are designed
to mount in either the Model 857B, or Model 858B
Card Frame Packages. The oscillator cards may be
mixed and matched with other system cards, within
the same card frame, without fear of system degrada-
tion.
For additional information, or applications assistance,
contact:
SALES ENGINEERING
OSCILLATOR CARDS
INSTALLATION & OPERATION MANUAL
®
546B
562B
INTEGRA III SYSTEM
Model 562B Shown
www.
protechaudio
.com
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