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Congratulations on you purchase of an OSSYNTHS contact free
sound synchronising disc. The Ossynths sync disk was designed by Otto
Schouwstra for use with his own sound system and is now manufactured and
marketed by EDM Models.
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Tools required
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Small files |
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Taper broaches |
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Wet & Dry paper |
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Cyanoacrylate glue |
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Multi-meter or Test lamp |
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Solder & Soldering iron |
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Prepare the disc
components.
The fret is cut with a laser which can leave some slightly
rough edges and a little bit of preparation is needed. Ease the four
layers of the disk from the brass fret. Clean the tabs off with a fine
file and then rub the flat faces on some fine wet and dry paper to
ensure all the burrs are removed.. Check the slot will slide easily over
your axle. It should be a close fit, not loose, but not needing to be
forced either. Ease with a fine file if needed. Make sure the wire for
the pins fits through the holes.
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Assemble the disc
to the axle
The disc layers are assembled on to the axle alternating
sides and then easing the pins through the holes as shown in the
sketches. Once happy with the placement of the disc the layers can be
secured to each other and to the axle with a small drop of cyanoacrylate
glue. Only the smallest drop is needed as the disc is under no stress.
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Understanding the
magnets
How the magnets are arranged is critical to the working
of the OSSYNTHS sync disk. The magnets have two poles, north & south,
when new the north pole is marked with some red dye. If the dye is
missing its not a big problem, what we need to know is the
difference between the poles. Try this; lay the magnets in a
straight line, if two adjacent magnets stick to each other you have a
north and south pair. If they repulse each other you have either a pair
of north's or a pair of
south's
[Tip1
– stick them in a row, mark the right hand end with a marker pen, pull
one off and mark the next, repeat. Now you have all the same poles
marked]
The four magnets are glued into the semi circular
indentations in the assembled disc. They should be arranged as shown in
the sketches so that there are alternating north and south poles around
the disc.
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Locating the reed
switch
The reed switch supplied in the kit goes in the
positions 1a or 1b shown in figs 1 & 2. This is either at 90 degrees to
the axle or parallel to it.
[Note: When bending the wires on the reed support
the wires adjacent to the glass with pliers to prevent the glass being
broken]
The range over which the reed will sense the magnets will be
in the range 1 – 6mm but you will need to test the set up to find the
optimum distance as it will be affected by the proximity of other bits
of your model. It might seem obvious but mount the reed away from the
motor – it’s a big magnet!
Solder two fine wires to the reed switch and connect these to
a test lamp and battery or to a multi-meter on the “beep”
setting. First test the reed switch by moving a magnet
close to it. Once you know your test circuit is working move the reed
into the position you want to mount it on your engine. Rotate the axle
and check that you get four clear beeps per revolution. Move the reed
nearer to, or further away from the magnets until you get clear pulses.
Once you are happy with the location permanently mount the
reed switch in that location fabricating any small brackets you may
need. Typically we use bits of copper clad ties or bits of styrene.
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Connecting up your
Synch Disc
How you connect your OSSYNTHS sync disc to your sound system
will vary from system to system. For use with Soundtraxx digital sound
decoders connect one end of the reed to the tan wire of the decoder and
the other end to one of the models power pickups.
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