Quantcast Figure 7-13.--Block diagram of the general alarm module.
 

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Figure 7-13.--Block diagram of the general alarm module.
the general alarm contact maker will energize relay
amount of time the alarm will continue sounding after
K302, which will ground all stages fed with -10 volts
the alarm contact maker is released. Normal adjustment
dc. K302 also supplies -30 volts dc to transistor Q307
is for a 15-second hold.
through relay K301, thus energizing K301, which holds
UNASSIGNED A ALARM.-- The unassigned A
K302 energized and supplies control voltage to the
alarm contains transistorized oscillator and timer
amplifier.
circuits that generate 500-Hz and 1500-Hz sine waves
The striking multivibrator also supplies a signal to
alternating at a rate of 1 1/2 Hz, producing a jump tone.
transistors Q203 and Q204 in the chemical alarm circuit,
Figure 7-14 is a block diagram of an unassigned A alarm
causing K202 in the chemical alarm circuit to operate
module. Operation of the unassigned A alarm contact
every time the gong strikes at the rate of 100 times per
maker supplies -10 volts dc through relay K401 to all
minute, causing the visual signal to flash.
stages of the circuit.
Resistor R311 (not shown) is a trimpot used in the
Resistor R406 (not shown) is a trimpot used in the
circuit to adjust the rate at which the alarm strikes.
circuit to adjust the high-frequency tone. Resistor R408
Clockwise rotation speeds up striking, while
(not shown) is a trimpot used in the circuit to adjust the
counterclockwise rotation reduces it. Normal
low-frequency tone. If adjustment is required, you
adjustment is for 100 strokes per minute. Resistor R302
should always make the low-frequency adjustment first.
(not shown) is a trimpot used in the circuit to adjust the
The normal setting is 500 cycles per second for the low
Figure 7-14.--Block diagram of the unassigned A alarm module.
7-13

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