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AIWA
MODEL
AD-1800EE,UK
;
G.SW
|
|
~—
d+
©
|
t
|
GSW
|
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I
ic
1 AD-1500
oe
4600
@|
Hall
IC
1
Ring magnet
Oh
AD-1800
< Fig. 17 >
e
Automatic Stopping Circuit Diagram
< Fig. 18 >
Hall element
e@
Operating Description
Approx.
2mm
OFF
OFF
Point (b) waveform
The
flux
variation
through
ring magnet
rotation
(coupled
with
counter
pulley
rotation)
imparted
to
the
Hail
IC
results in an output as shown in Fig. 22.
Zz 4
+
®
>
3D
es 2
Sf
6 8. O8b=-2
fase
Transistor on level
< Fig. 22 >
lf this
voitage
were
applied
directly
to
TR1
base,
the
transistor on and off times would differ, since the voltage is
2V even
with 0 magnetic flux. R1 and R2 perform dividing
in order to equalize on and off times. TR1
collector output
voltage waveform
(at b) becomes the waveform applied to
(b).
e@ Hall iC Handling Cautions
The
Hall
element
is located
within
the
IC as
illustrated
in
Fig. 23.
If the
magnet
position
becomes
disturbed,
or
its
distance
increased,
the
IC
output
declines.
Caution
is
therefore needed.
2:5
12.0
1.
Vee
2.
Output 1
3.
Output 2
4.
GHD
|
2
3
4
< Fig.
23>
Specified position is approximately
2mm
from magnet.
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